Loans Receivable and Allowance for Credit Losses - Summarized Loans Held for Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	$ 20,184,393	$ 19,515,513
Premiums on purchased loans	1,676	1,524
Net deferred fees	(15,999)	(12,976)
Total loans	20,170,070	19,504,061
Commercial
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	7,604,830	7,398,792
Multi-family
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	3,841,754	3,667,337
Construction
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	694,807	662,112
Residential
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	1,911,472	1,974,324
Mortgage loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	14,052,863	13,702,565
Mortgage loans \| Commercial
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	7,604,830	7,398,792
Mortgage loans \| Multi-family
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	3,841,754	3,667,337
Mortgage loans \| Construction
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	694,807	662,112
Mortgage loans \| Residential
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	1,911,472	1,974,324
Commercial loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	5,520,560	5,200,517
Consumer loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	$ 610,970	$ 612,431

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

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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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Amount of unamortized loan commitment, origination, and other costs (fees) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

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Amount of unamortized purchase premium (discount) on financing receivable. Excludes financing receivable covered under loss sharing agreement.

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