v3.26.1
Loans Receivable, Allowance for Credit Losses and Credit Quality - Consumer loan pools (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Loans receivable, net of deferred fees $ 6,209,910 $ 5,986,140
Carrying value of loans pledged to secure advances 189,701 196,235
Investment securities pledged | FHLB    
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Carrying value of loans pledged to secure advances 1,250,000 1,560,000
Consumer, portfolio    
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Gross Loan 168,632 166,141
Premium (Discount) (4,272) (4,646)
Loans receivable, net of deferred fees 164,360 161,495
Consumer, portfolio | Student loans    
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Gross Loan 4,993 5,421
Premium (Discount) 36 34
Loans receivable, net of deferred fees 5,029 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 82,167 75,560
Loans receivable, net of deferred fees 82,167 75,560
Consumer, portfolio | Solar panel loans    
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Gross Loan 47,364 49,077
Premium (Discount) (4,284) (4,667)
Loans receivable, net of deferred fees 43,080 44,410
Consumer, portfolio | Home improvement loans    
Loans Receivable, Allowance for Credit Losses and Credit Quality    
Gross Loan 34,108 35,845
Premium (Discount) (24) (13)
Loans receivable, net of deferred fees $ 34,084 $ 35,832