Loans Receivable, Net - Collateral-Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Collateral Dependent Loans
Collateral dependent loans	$ 69,533	$ 64,455
Business assets
Collateral Dependent Loans
Collateral dependent loans	26,992	4,325
Residential real estate
Collateral Dependent Loans
Collateral dependent loans	5,558	7,148
Other real estate
Collateral Dependent Loans
Collateral dependent loans	24,255	16,127
Other
Collateral Dependent Loans
Collateral dependent loans	12,728	36,855
Residential real estate
Collateral Dependent Loans
Collateral dependent loans	3,058	3,402
Residential real estate | Business assets
Collateral Dependent Loans
Collateral dependent loans	0	0
Residential real estate | Residential real estate
Collateral Dependent Loans
Collateral dependent loans	2,412	3,338
Residential real estate | Other real estate
Collateral Dependent Loans
Collateral dependent loans	646	64
Residential real estate | Other
Collateral Dependent Loans
Collateral dependent loans	0	0
Commercial real estate
Collateral Dependent Loans
Collateral dependent loans	21,605	15,818
Commercial real estate | Business assets
Collateral Dependent Loans
Collateral dependent loans	60	37
Commercial real estate | Residential real estate
Collateral Dependent Loans
Collateral dependent loans	569	1,043
Commercial real estate | Other real estate
Collateral Dependent Loans
Collateral dependent loans	20,976	14,738
Commercial real estate | Other
Collateral Dependent Loans
Collateral dependent loans	0	0
Other commercial
Collateral Dependent Loans
Collateral dependent loans	41,562	42,041
Other commercial | Business assets
Collateral Dependent Loans
Collateral dependent loans	26,932	4,288
Other commercial | Residential real estate
Collateral Dependent Loans
Collateral dependent loans	126	198
Other commercial | Other real estate
Collateral Dependent Loans
Collateral dependent loans	2,114	1,086
Other commercial | Other
Collateral Dependent Loans
Collateral dependent loans	12,390	36,469
Home equity
Collateral Dependent Loans
Collateral dependent loans	2,457	2,713
Home equity | Business assets
Collateral Dependent Loans
Collateral dependent loans	0	0
Home equity | Residential real estate
Collateral Dependent Loans
Collateral dependent loans	2,276	2,513
Home equity | Other real estate
Collateral Dependent Loans
Collateral dependent loans	181	200
Home equity | Other
Collateral Dependent Loans
Collateral dependent loans	0	0
Other consumer
Collateral Dependent Loans
Collateral dependent loans	851	481
Other consumer | Business assets
Collateral Dependent Loans
Collateral dependent loans	0	0
Other consumer | Residential real estate
Collateral Dependent Loans
Collateral dependent loans	175	56
Other consumer | Other real estate
Collateral Dependent Loans
Collateral dependent loans	338	39
Other consumer | Other
Collateral Dependent Loans
Collateral dependent loans	$ 338	$ 386