Loans Receivable and Allowance for Credit Losses (Schedule of Aging Loans Receivable by Portfolio Segment and Class) (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	$ 19,658,807	$ 19,515,513
Non-accrual	142,924	78,420
Non-accrual loans with no related allowance	140,748	67,506
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	7,423,652	7,398,792
Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	3,724,236	3,667,337
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	640,929	662,112
Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	1,960,861	1,974,324
Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	182,039	112,451
30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	29,068	27,508
60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	10,047	6,523
Recorded Investment > 90 days accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	0	0
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	19,476,768	19,403,062
Mortgage loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	13,749,678	13,702,565
Non-accrual	34,199	43,345
Non-accrual loans with no related allowance	34,199	38,995
Mortgage loans \| Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	7,423,652	7,398,792
Non-accrual	21,977	26,856
Non-accrual loans with no related allowance	21,977	22,506
Mortgage loans \| Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	3,724,236	3,667,337
Non-accrual	275	2,268
Non-accrual loans with no related allowance	275	2,268
Mortgage loans \| Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	640,929	662,112
Non-accrual	3,278	5,159
Non-accrual loans with no related allowance	3,278	5,159
Mortgage loans \| Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	1,960,861	1,974,324
Non-accrual	8,669	9,062
Non-accrual loans with no related allowance	8,669	9,062
Mortgage loans \| Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	56,213	72,450
Mortgage loans \| Total Past Due \| Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	24,642	42,508
Mortgage loans \| Total Past Due \| Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	969	3,200
Mortgage loans \| Total Past Due \| Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	9,917	5,159
Mortgage loans \| Total Past Due \| Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	20,685	21,583
Mortgage loans \| 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	15,121	23,996
Mortgage loans \| 30-59 Days \| Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	2,665	15,652
Mortgage loans \| 30-59 Days \| Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	694	0
Mortgage loans \| 30-59 Days \| Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	6,639	0
Mortgage loans \| 30-59 Days \| Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	5,123	8,344
Mortgage loans \| 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	6,893	5,109
Mortgage loans \| 60-89 Days \| Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	0	0
Mortgage loans \| 60-89 Days \| Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	0	932
Mortgage loans \| 60-89 Days \| Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	0	0
Mortgage loans \| 60-89 Days \| Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	6,893	4,177
Mortgage loans \| Recorded Investment > 90 days accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	0	0
Mortgage loans \| Recorded Investment > 90 days accruing \| Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	0	0
Mortgage loans \| Recorded Investment > 90 days accruing \| Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	0	0
Mortgage loans \| Recorded Investment > 90 days accruing \| Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	0	0
Mortgage loans \| Recorded Investment > 90 days accruing \| Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	0	0
Mortgage loans \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	13,693,465	13,630,115
Mortgage loans \| Current \| Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	7,399,010	7,356,284
Mortgage loans \| Current \| Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	3,723,267	3,664,137
Mortgage loans \| Current \| Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	631,012	656,953
Mortgage loans \| Current \| Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	1,940,176	1,952,741
Commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	5,301,113	5,200,517
Non-accrual	107,398	33,219
Non-accrual loans with no related allowance	105,222	26,655
Commercial loans \| Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	120,277	35,155
Commercial loans \| 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	10,359	1,303
Commercial loans \| 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	2,520	633
Commercial loans \| Recorded Investment > 90 days accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	0	0
Commercial loans \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	5,180,836	5,165,362
Consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	608,016	612,431
Non-accrual	1,327	1,856
Non-accrual loans with no related allowance	1,327	1,856
Consumer loans \| Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	5,549	4,846
Consumer loans \| 30-59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	3,588	2,209
Consumer loans \| 60-89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	634	781
Consumer loans \| Recorded Investment > 90 days accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	0	0
Consumer loans \| Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	$ 602,467	$ 607,585

Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease.

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