Borrowings, FHLB Stock and Subordinated Notes - Schedule of Borrowing Capacity from the FHLB (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Line of Credit Facility [Line Items]
Advance equivalent of collateral	$ 911,953	$ 901,827
FHLB of Des Moines
Line of Credit Facility [Line Items]
Amount available to borrow under credit facility	370,427	385,366
Remaining FHLB borrowing capacity	158,856	172,327
FHLB of Des Moines | Notional amount of letters of credit outstanding
Line of Credit Facility [Line Items]
Notional amount of letters of credit outstanding	14,000	8,000
FHLB of Des Moines | One-to-four family loans | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Advance equivalent of collateral	174,048	175,907
FHLB of Des Moines | Commercial and multifamily loans | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Advance equivalent of collateral	23,583	29,180
FHLB of Des Moines | Home equity loans | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Advance equivalent of collateral	$ 226	$ 241