v3.26.1
Loans Receivable, Allowance for Credit Losses and Credit Quality - Consumer loan pools (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Loans receivable, net of deferred fees $ 6,422,894 $ 5,986,140
Carrying value of loans pledged to secure advances 181,247 196,235
Investment securities pledged | FHLB    
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Carrying value of loans pledged to secure advances 1,160,000 1,560,000
Consumer, portfolio    
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Gross Loan 170,738 166,141
Premium (Discount) (3,864) (4,646)
Loans receivable, net of deferred fees 166,874 161,495
Consumer, portfolio | Student loans    
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Gross Loan 4,668 5,421
Premium (Discount) 34 34
Loans receivable, net of deferred fees 4,702 5,455
Consumer, portfolio | Boat 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 88,596 75,560
Loans receivable, net of deferred fees 88,596 75,560
Consumer, portfolio | Solar panel loans    
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Gross Loan 45,049 49,077
Premium (Discount) (3,899) (4,667)
Loans receivable, net of deferred fees 41,150 44,410
Consumer, portfolio | Home improvement loans    
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Gross Loan 32,425 35,845
Premium (Discount) 1 (13)
Loans receivable, net of deferred fees $ 32,426 $ 35,832