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Loans Receivable and Allowance for Credit Losses - Summarized Loans Held for Investment (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross loans $ 19,515,513 $ 18,667,570
Premiums on purchased loans 1,524 1,338
Net deferred fees (12,976) (9,538)
Total loans 19,504,061 18,659,370
Mortgage Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross loans 13,702,565 13,445,151
Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross loans 5,200,517 4,608,600
Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross loans 612,431 613,819
Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross loans 7,398,792 7,228,078
Commercial | Mortgage Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross loans 7,398,792 7,228,078
Multi-family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross loans 3,667,337 3,382,933
Multi-family | Mortgage Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross loans 3,667,337 3,382,933
Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross loans 662,112 823,503
Construction | Mortgage Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross loans 662,112 823,503
Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross loans 1,974,324 2,010,637
Residential | Mortgage Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total gross loans $ 1,974,324 $ 2,010,637