Loans Receivable and Allowance for Loan Losses - Summary of average recorded investment balance of impaired loans and interest income recognized on impaired loans by portfolio segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Impaired loans without a valuation allowance:
Average Carrying Amount	$ 16,913	$ 24,195	$ 16,957	$ 24,216
Interest Income Recognized	27	90	61	481
Impaired loans with a valuation allowance:
Average Carrying Amount	26,419	24,839	26,537	26,949
Interest Income Recognized	168	92	474	606
Total impaired loans
Average Carrying Amount	43,332	49,034	43,494	51,165
Interest Income Recognized	195	182	535	1,087
Residential Real Estate
Impaired loans without a valuation allowance:
Average Carrying Amount	3,864	3,058	3,901	3,080
Interest Income Recognized	21	13	45	28
Impaired loans with a valuation allowance:
Average Carrying Amount	0	1,775	0	1,791
Interest Income Recognized	0	12	0	40
Commercial Real Estate
Impaired loans without a valuation allowance:
Average Carrying Amount	1,082	10,153	1,171	10,121
Interest Income Recognized	0	72	0	435
Impaired loans with a valuation allowance:
Average Carrying Amount	24,419	20,301	24,439	22,386
Interest Income Recognized	148	62	426	490
Commercial business
Impaired loans without a valuation allowance:
Average Carrying Amount	2,585	1,987	2,619	2,018
Interest Income Recognized	6	5	16	18
Impaired loans with a valuation allowance:
Average Carrying Amount	2,000	2,763	2,098	2,772
Interest Income Recognized	20	18	48	76
Construction
Impaired loans without a valuation allowance:
Average Carrying Amount	9,382	8,997	9,266	8,997
Interest Income Recognized	$ 0	$ 0	$ 0	$ 0