Loans Receivable and Allowance for Credit Losses (Schedule of Summarized Loans Receivable) (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	$ 19,658,807	$ 19,515,513
Premiums on purchased loans	1,700	1,524
Net deferred fees	(12,805)	(12,976)
Total loans held for investment	19,647,702	19,504,061
Commercial
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	7,423,652	7,398,792
Multi-family
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	3,724,236	3,667,337
Construction
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	640,929	662,112
Residential
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	1,960,861	1,974,324
Mortgage loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	13,749,678	13,702,565
Mortgage loans \| Commercial
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	7,423,652	7,398,792
Mortgage loans \| Multi-family
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	3,724,236	3,667,337
Mortgage loans \| Construction
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	640,929	662,112
Mortgage loans \| Residential
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	1,960,861	1,974,324
Commercial loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	5,301,113	5,200,517
Consumer loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	$ 608,016	$ 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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