Bank Branches › Closed and merged banks › Wisconsin › Security Bank, S.S.B.
What happened to Security Bank, S.S.B.?
Security Bank, S.S.B. in Milwaukee, WI (earlier called Security Savings and Loan Association) merged into M&I Marshall and Ilsley Bank of Milwaukee, WI on Oct 1, 1997. After 1 more change of hands, what was Security Bank, S.S.B. is today part of BMO Bank National Association (Chicago, IL).
The chain, step by step
From the day it opened to the bank at the end of the chain today. Each step is one entry in the FDIC's record.
- 1913Security Savings and Loan Association opens in Milwaukee, WI
- May 14, 1990renamed Security Bank, S.S.B.
- Oct 1, 1997MERGEDSecurity Bank, S.S.B. merged into M&I Marshall and Ilsley Bank of Milwaukee, WI.FDIC certificate 28685 ends; its business continues under certificate 1020.
- Jul 5, 2011MERGEDM&I Marshall and Ilsley Bank of Milwaukee, WI merged into Harris National Association of Chicago, IL.FDIC certificate 1020 ends; its business continues under certificate 16571.
- TodayOPEN
BMO Bank National AssociationMain office Chicago, IL · FDIC certificate 16571 · 988 offices in 23 states on June 30, 2026Every BMO Bank National Association office → Website on file with the FDIC: www.bmo.com
If you still have something from Security Bank, S.S.B.
A lien that was never released
If a paid-off mortgage, home-equity line or car loan still shows Security Bank, S.S.B. as lienholder, start with BMO Bank National Association. In a merger the surviving bank takes over the other bank's loans, so it is the bank to ask for a recordable lien release; if the loan was sold along the way, it can tell you to whom.
The FDIC says it cannot process lien releases for banks that merged or were acquired without government assistance, which is what the record shows here.
Record the release with the same county office that recorded the original mortgage or deed of trust.
An old account, passbook or CD
Ask BMO Bank National Association to search for the account under the name Security Bank, S.S.B.. A passbook or certificate shows an account existed. It doesn't show the money is still there, and the OCC notes that federal rules require banks to keep most account records for five years.
Accounts nobody touches are eventually turned over to a state. The OCC puts the usual wait at three to five years with no activity, set by each state's law. Search the unclaimed-property program of the state of the owner's last known address on the bank's records, and any other state they lived in. It is free to search and to claim through a state's own site, and MissingMoney.com, an official site of the state administrators' association, searches most states at once.
A safe deposit box
Ask BMO Bank National Association which branch now holds boxes from the Security Bank, S.S.B. office you used. The OCC says a box with no activity for three to five years (the period is set by state statute) is likely treated as dormant, and its contents may be turned over to the state's unclaimed-property program.
Box contents are not covered by FDIC insurance.
Not sure this is your bank?
Many banks shared a name. Match the city and the years above against your paperwork, or search again with the town.
Credit unions were never FDIC-insured and are not in this record; the NCUA credit union lookup covers those. Banks that closed before about 1970 are not in the FDIC's list either.
One caution: banks also sell single branches. If the office you used was sold to a different bank along the way, the account went with the branch, not with this chain. The office list below shows which bank each office reports under now.
This page is drawn from FDIC records and federal guidance. It is not legal advice, and BankBranches is not a bank or a government office. More detail: lien releases · old passbooks and CDs · safe deposit boxes · unclaimed money.
Where the guidance comes from ▾
Its offices in the FDIC deposit reports
47 offices filed under this charter in some year from 1994 on. 11 are still open as of June 30, 2026. Showing 40.
| Office | Now |
|---|---|
| 2225 N Calhoun RdBrookfield, WI | OpenBMO Bank National Association |
| 4677 S Packard AveCudahy, WI | OpenBMO Bank National Association |
| 2555 S 108th StWest Allis, WI | OpenBMO Bank National Association |
| 6645 W Oklahoma AveMilwaukee, WI | OpenBMO Bank National Association |
| 510 2nd StAlgoma, WI | OpenBank of Luxemburg |
| 7600 W Layton AveMilwaukee, WI | OpenBMO Bank National Association |
| 4100 Durand AveRacine, WI | OpenBMO Bank National Association |
| 1964 Dickinson RdDe Pere, WI | OpenBMO Bank National Association |
| 108 N Lake AveCrandon, WI | OpenLaona State Bank |
| 2701 W National AveMilwaukee, WI | OpenBMO Bank National Association |
| 724 5th AveAntigo, WI | OpenAssociated Bank, National Association |
| 114 E Union StreetWaupaca, WI | No longer reported |
| 2120 S Ridge RoadAshwaubenon, WI | No longer reported |
| 1087 Velp AvenueGreen Bay, WI | No longer reported |
| 1530 W Mason StreetGreen Bay, WI | No longer reported |
| 1684 Main StreetGreen Bay, WI | No longer reported |
| 234 S Adams StreetGreen Bay, WI | No longer reported |
| 2009 East Calumet AvenueAppleton, WI | No longer reported |
| 2829 N Meade StreetAppleton, WI | No longer reported |
| 2506 Roosevelt RdMarinette, WI | No longer reported |
| 9210 W North AvenueWauwatosa, WI | No longer reported |
| 4534 W North AveMilwaukee, WI | No longer reported |
| 5555 N Port Washington RoadGlendale, WI | No longer reported |
| 184 West Wisconsin AvenueMilwaukee, WI | No longer reported |
| 7100 W Center StMilwaukee, WI | No longer reported |
| 9049 N 76 StMilwaukee, WI | No longer reported |
| 5812 West Burnham StWest Allis, WI | No longer reported |
| 326 East Wisconsin AvenueOconomowoc, WI | No longer reported |
| N 85 W 16058 Appleton AveMenomonee Falls, WI | No longer reported |
| 808 E. Main StreetWatertown, WI | No longer reported |
| 347 N Sawyer StreetOshkosh, WI | No longer reported |
| 3215 Douglas AvenueRacine, WI | No longer reported |
| 468 College AvenueRacine, WI | No longer reported |
| 5100 Washington AvenueRacine, WI | No longer reported |
| 1334 Ellis StreetKewaunee, WI | No longer reported |
| 1134 Grand AvenueRothschild, WI | No longer reported |
| 2001 Stewart AvenueWausau, WI | No longer reported |
| 400 4th StreetWausau, WI | No longer reported |
| 4 South Brown StreetRhinelander, WI | No longer reported |
| 624 Anderson StreetThree Lakes, WI | No longer reported |
Banks folded into Security Bank, S.S.B.
9 banks merged directly into this charter; counting the banks those had absorbed earlier, 11 charters end up inside it.
| Bank | Ended |
|---|---|
| Liberty Savings and Loan AssociationWest Allis, WI | Dec 31, 1987 |
| Colonial Savings AssociationGreen Bay, WI | May 31, 1987 |
| Oconomowoc Savings and Loan AssociationOconomowoc, WI | Oct 31, 1982 |
| Union Savings and Loan AssociationRacine, WI | Jul 31, 1982 |
| North Central Savings and Loan AssociationAntigo, WI | Jan 31, 1982 |
| Heart O Lakes Savings and Loan AssociationRhinelander, WI | Jan 31, 1982 |
| Cudahy Savings and Loan AssociationCudahy, WI | Oct 31, 1980 |
| Franklin Savings and Loan AssociationWausau, WI | Oct 31, 1978 |
| Community Savings and Loan AssociationMilwaukee, WI | Oct 31, 1976 |
Source: FDIC BankFind institution and history records, read Nov 15, 2026. The FDIC's list covers banks that ended in about 1970 or later. Look up certificate 28685 in the FDIC BankFind Suite to see the government's own entry. Corrections: me@byclaude.net.