Bank Branches › Closed and merged banks › Montana › Mountain West Bank, National Association
What happened to Mountain West Bank, National Association?
Mountain West Bank, National Association in Helena, MT (earlier called Mountain West Bank of Helena, National Association) merged into First Interstate Bank of Billings, MT on Oct 18, 2014. First Interstate Bank is open today.
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.
- 1991Mountain West Bank of Helena, National Association opens in Helena, MT
- Jan 1, 1998renamed Mountain West Bank, National Association
- Oct 18, 2014MERGEDMountain West Bank, National Association merged into First Interstate Bank of Billings, MT.FDIC certificate 33314 ends; its business continues under certificate 1105.
- TodayOPEN
First Interstate BankMain office Billings, MT · FDIC certificate 1105 · 274 offices in 10 states on June 30, 2026Every First Interstate Bank office → Website on file with the FDIC: www.firstinterstatebank.com
If you still have something from Mountain West Bank, National Association
A lien that was never released
If a paid-off mortgage, home-equity line or car loan still shows Mountain West Bank, National Association as lienholder, start with First Interstate Bank. 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 First Interstate Bank to search for the account under the name Mountain West Bank, National Association. 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 First Interstate Bank which branch now holds boxes from the Mountain West Bank, National Association 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
14 offices filed under this charter in some year from 1994 on. 1 is still open as of June 30, 2026.
| Office | Now |
|---|---|
| 12 3rd St NwGreat Falls, MT | OpenFirst Interstate Bank |
| 1960 N. 19th AvenueBozeman, MT | No longer reported |
| 2728 Colonial DrHelena, MT | No longer reported |
| 2021 N Montana AveHelena, MT | No longer reported |
| 915 Saddle DriveHelena, MT | No longer reported |
| 1135 EuclidHelena, MT | No longer reported |
| 50 West 14th Street, Suite 100Helena, MT | No longer reported |
| 444 West IdahoKalispell, MT | No longer reported |
| 601 Spokane AvenueWhitefish, MT | No longer reported |
| 1821 South AvenueMissoula, MT | No longer reported |
| 301 East BroadwayMissoula, MT | No longer reported |
| 3301 Great Northern AvenueMissoula, MT | No longer reported |
| 2828 10th Avenue SouthGreat Falls, MT | No longer reported |
| 1109 6th Avenue N.Great Falls, MT | No longer reported |
Banks folded into Mountain West Bank, National Association
2 banks merged directly into this charter.
| Bank | Ended |
|---|---|
| Mountain West Bank of Kalispell, National AssociationKalispell, MT | Apr 4, 2009 |
| Mountain West Bank of Great Falls, National AssociationGreat Falls, MT | Jan 1, 1998 |
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 33314 in the FDIC BankFind Suite to see the government's own entry. Corrections: me@byclaude.net.