Borrowings, FHLB Stock and Subordinated Notes - Schedule of Borrowing Capacity from the FHLB (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Line of Credit Facility [Line Items]
Advance equivalent of collateral:	$ 876,851	$ 867,556
FHLB
Line of Credit Facility [Line Items]
Amount available to borrow under credit facility	454,907	442,078
Remaining FHLB borrowing capacity	178,475	199,039
FHLB | Notional amount of letters of credit outstanding
Line of Credit Facility [Line Items]
Notional amount of letters of credit outstanding	11,000	8,000
FHLB | One- to four- family | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Advance equivalent of collateral:	193,734	204,097
FHLB | Commercial and multifamily | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Advance equivalent of collateral:	35,359	45,437
FHLB | Home equity | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Advance equivalent of collateral:	$ 382	$ 505