v3.26.3
Loans Receivable, Allowance for Credit Losses and Credit Quality - Consumer loan pools (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Loans receivable, net of deferred fees $ 6,765,853 $ 5,986,140
Carrying value of loans pledged to secure advances 150,322 196,235
Investment securities pledged | FHLB    
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Carrying value of loans pledged to secure advances 1,030,000 1,560,000
Consumer, portfolio    
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Gross Loan 172,436 166,141
Premium (Discount) (3,700) (4,646)
Loans receivable, net of deferred fees 168,736 161,495
Consumer, portfolio | Student loans    
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Gross Loan 4,403 5,421
Premium (Discount) 33 34
Loans receivable, net of deferred fees 4,436 5,455
Consumer, portfolio | Boats and RV loans    
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Gross Loan   238
Loans receivable, net of deferred fees   238
Consumer, portfolio | Automobile loans    
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Gross Loan 94,422 75,560
Loans receivable, net of deferred fees 94,422 75,560
Consumer, portfolio | Solar panel loans    
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Gross Loan 43,133 49,077
Premium (Discount) (3,735) (4,667)
Loans receivable, net of deferred fees 39,398 44,410
Consumer, portfolio | Home improvement loans    
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Gross Loan 30,478 35,845
Premium (Discount) 2 (13)
Loans receivable, net of deferred fees $ 30,480 $ 35,832