Loans Receivable and Allowance for Credit Losses - Charge Offs (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	$ 3,303	$ 5,720	$ 9,097	$ 10,461
Mortgage loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Year one, originated, current fiscal year, writeoff	0	0	0	0
Year two, originated, fiscal year before current fiscal year, writeoff	0	0	201	0
Year three, originated, two years before current fiscal year, writeoff	0	520	0	520
Year four, originated, three years before current fiscal year, writeoff	0	0	0	358
Year five, originated, four years before current fiscal year, writeoff	0	0	0	0
Originated, more than five Years before current fiscal year, writeoff	210	679	932	2,253
Total Loans	210	1,199	1,132	3,132
Mortgage loans \| Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Year one, originated, current fiscal year, writeoff	0	0	0	0
Year two, originated, fiscal year before current fiscal year, writeoff	0	0	0	0
Year three, originated, two years before current fiscal year, writeoff	0	0	0	0
Year four, originated, three years before current fiscal year, writeoff	0	0	0	358
Year five, originated, four years before current fiscal year, writeoff	0	0	0	0
Originated, more than five Years before current fiscal year, writeoff	134	540	368	2,047
Total Loans	134	540	368	2,406
Mortgage loans \| Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Year one, originated, current fiscal year, writeoff		0	0	0
Year two, originated, fiscal year before current fiscal year, writeoff		0	201	0
Year three, originated, two years before current fiscal year, writeoff		520	0	520
Year four, originated, three years before current fiscal year, writeoff		0	0	0
Year five, originated, four years before current fiscal year, writeoff		0	0	0
Originated, more than five Years before current fiscal year, writeoff		139	486	206
Total Loans		659	687	726
Mortgage loans \| Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Year one, originated, current fiscal year, writeoff	0		0
Year two, originated, fiscal year before current fiscal year, writeoff	0		0
Year three, originated, two years before current fiscal year, writeoff	0		0
Year four, originated, three years before current fiscal year, writeoff	0		0
Year five, originated, four years before current fiscal year, writeoff	0		0
Originated, more than five Years before current fiscal year, writeoff	76		77
Total Loans	76		77
Commercial loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Year one, originated, current fiscal year, writeoff	0	0	0	0
Year two, originated, fiscal year before current fiscal year, writeoff	2,727	0	5,558	0
Year three, originated, two years before current fiscal year, writeoff	0	0	0	39
Year four, originated, three years before current fiscal year, writeoff	0	0	168	2,362
Year five, originated, four years before current fiscal year, writeoff	0	0	1,335	126
Originated, more than five Years before current fiscal year, writeoff	14	4,368	42	4,368
Total Loans	2,741	4,368	7,102	6,894
Consumer loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Year one, originated, current fiscal year, writeoff	0	2	12	20
Year two, originated, fiscal year before current fiscal year, writeoff	16	25	17	38
Year three, originated, two years before current fiscal year, writeoff	0	8	1	20
Year four, originated, three years before current fiscal year, writeoff	0	0	15	3
Year five, originated, four years before current fiscal year, writeoff	0	0	0	0
Originated, more than five Years before current fiscal year, writeoff	199	2	350	39
Total Loans	216	37	394	120
Total gross loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Year one, originated, current fiscal year, writeoff	0	2	12	20
Year two, originated, fiscal year before current fiscal year, writeoff	2,744	25	5,775	38
Year three, originated, two years before current fiscal year, writeoff	0	529	1	580
Year four, originated, three years before current fiscal year, writeoff	0	0	183	2,723
Year five, originated, four years before current fiscal year, writeoff	0	0	1,335	126
Originated, more than five Years before current fiscal year, writeoff	422	5,049	1,324	6,660
Total Loans	3,167	5,604	8,628	10,146
Construction \| Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Year one, originated, current fiscal year, writeoff			0
Year two, originated, fiscal year before current fiscal year, writeoff			0
Year three, originated, two years before current fiscal year, writeoff			0
Year four, originated, three years before current fiscal year, writeoff			0
Year five, originated, four years before current fiscal year, writeoff			0
Originated, more than five Years before current fiscal year, writeoff			0
Total Loans			0
Consumer Overdraft Accounts
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	352	153	863	435
Consumer Overdraft Accounts \| Consumer Loans, Overdraft Accounts
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	$ 136	$ 116	$ 469	$ 315

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

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