First Interstate Bank

What sets First Interstate Bank apart

• Over the year to Q2 2026, the total assets of First Interstate Bank fell by 6.2% to $25.8 bn, a bigger fall than at 97% of covered banks.
• Over the year to Q2 2026, the total deposits of First Interstate Bank fell by 5.6% to $21.7 bn, a bigger fall than at 97% of covered banks.

How large is First Interstate Bank?

The balance sheet of First Interstate Bank at Q2 2026: assets $25.8 bn, deposits $21.7 bn, net loans $14.1 bn (loans equal to 64.88% of deposits). Securities make up 31.0% of total assets at First Interstate Bank. Since Q1 2016, when First Interstate Bank held $8.7 bn, its assets grew 197.9%. In the year to Q2 2026, deposits at First Interstate Bank fell 5.6% while its total assets fell 6.2%. At Q2 2026, First Interstate Bank employed 3,016 full-time equivalent staff across 274 offices, about $8.6 mn of assets per employee and $79.3 mn of deposits per office.

How much funding at First Interstate Bank is uninsured?

At First Interstate Bank, uninsured deposits (above the FDIC limit) made up 36.43% of domestic deposits at Q2 2026 (+1.54 pp on a year earlier); First Interstate Bank ranks 237th of 500 on this measure. In dollars, First Interstate Bank estimated $7.9 bn of uninsured deposits.

Key facts, Q2 2026

US rank of First Interstate Bank: 1 = highest unless marked 1 = lowest.

The CET1 ratio of First Interstate Bank stood at 14.32% in Q2 2026, +0.97 pp year on year. Low and high at First Interstate Bank since Q1 2016: 10.89% (Q4 2022) to 14.32% (Q2 2026). Equity capital of First Interstate Bank at Q2 2026: $3.3 bn, or 12.6% of total assets. First Interstate Bank also reported a total capital ratio of 15.46% for Q2 2026, and a tier 1 leverage ratio of 9.42%.

On held-to-maturity securities, First Interstate Bank carried an unrealized loss of $215.6 mn at Q2 2026, equal to 6.6% of equity capital. The loss narrowed by $37.9 mn over the year. Its deepest point: $464.2 mn in Q3 2023. The available-for-sale portfolio of First Interstate Bank showed an unrealized loss of $263.8 mn at Q2 2026; the loss narrowed by $38.4 mn over the year.

For the year to Q2 2026, First Interstate Bank earned a return on equity of 9.61%; return on assets: 1.21%. Net interest margin at First Interstate Bank: 3.55%, +0.20 pp in a year. First Interstate Bank net income: $158.4 mn, up 16.1% year on year. The efficiency ratio of First Interstate Bank was 58.39%: about 58 cents cost per revenue dollar, against 47 cents at the median peer.

At Q2 2026, noncurrent loans were 1.12% of total loans at First Interstate Bank; net charge-offs: 0.16% of average loans. Gross loans and leases at First Interstate Bank: $14.3 bn, down 14.4% in a year.

The peer group of First Interstate Bank is the 6 banks nearest to it by total assets at Q2 2026: 3 larger and 3 smaller. Of the peers, 3 share the charter type of First Interstate Bank (state member bank), 6 sit in the same size group ($10 bn to $100 bn) and 0 have head offices in Montana. Against them, First Interstate Bank shows CET1 ratio 14.32% against a peer median of 14.20%, return on equity 9.61% against a peer median of 11.85% and uninsured deposit share 36.43% against a peer median of 38.88%.

The FDIC history of First Interstate Bank, oldest first; figures before and after each event are not like for like.

1. 13 August 2016. Absorbed Flathead Bank of Bigfork, Montana (FDIC certificate 20382).
2. 12 August 2017. Absorbed Bank of the Cascades (FDIC certificate 22407).
3. 10 November 2018. Absorbed Inland Northwest Bank (FDIC certificate 27601).
4. 8 April 2019. Absorbed Community 1st Bank (FDIC certificate 58576).
5. 8 April 2019. Absorbed Idaho Independent Bank (FDIC certificate 33845).
6. 1 February 2022. Absorbed Great Western Bank (FDIC certificate 15289).

Large one-quarter moves at First Interstate Bank

• Total assets at First Interstate Bank changed by +37.1% in the quarter to 2017-09-30: Merger -Without Assistance; Participated in Absorbtion/Consolidation/Merger: acquired from Bank of the Cascades.
• Total assets at First Interstate Bank changed by +68.7% in the quarter to 2022-03-31: Absorbtion - Without Assistance; Participated in Absorbtion/Consolidation/Merger: acquired from Great Western Bank.