v3.26.1
Allowance for credit losses - Amortized Cost Basis of Modified Financing Receivables That Subsequently Defaulted (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date $ 10,568 $ 6,737
Mortgages    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 8,586 5,235
Commercial | CRE owner occupied    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date   346
Commercial | Commercial and Industrial    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 442 361
Consumer | Credit card    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 1,202 632
Consumer | Personal loans    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 338 163
Interest Rate Reduction    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 271 344
Interest Rate Reduction | Mortgages    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 0 0
Interest Rate Reduction | Commercial | CRE owner occupied    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date   0
Interest Rate Reduction | Commercial | Commercial and Industrial    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 152 81
Interest Rate Reduction | Consumer | Credit card    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 69 178
Interest Rate Reduction | Consumer | Personal loans    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 50 85
Extension of maturity date    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 7,781 4,984
Extension of maturity date | Mortgages    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 7,741 4,820
Extension of maturity date | Commercial | CRE owner occupied    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date   89
Extension of maturity date | Commercial | Commercial and Industrial    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 40 64
Extension of maturity date | Consumer | Credit card    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 0 0
Extension of maturity date | Consumer | Personal loans    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 0 11
Other-Than-Insignificant Payment Delays    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 123 341
Other-Than-Insignificant Payment Delays | Mortgages    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 109 0
Other-Than-Insignificant Payment Delays | Commercial | CRE owner occupied    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date   257
Other-Than-Insignificant Payment Delays | Commercial | Commercial and Industrial    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 14 84
Other-Than-Insignificant Payment Delays | Consumer | Credit card    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 0 0
Other-Than-Insignificant Payment Delays | Consumer | Personal loans    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 0 0
Combination of reduction of interest rate and extension of maturity    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 1,120 482
Combination of reduction of interest rate and extension of maturity | Mortgages    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 736 415
Combination of reduction of interest rate and extension of maturity | Commercial | CRE owner occupied    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date   0
Combination of reduction of interest rate and extension of maturity | Commercial | Commercial and Industrial    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 96 0
Combination of reduction of interest rate and extension of maturity | Consumer | Credit card    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 0 0
Combination of reduction of interest rate and extension of maturity | Consumer | Personal loans    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 288 67
Combination - Interest Rate Reduction and Other-Than-Insignificant Payment Delays    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 1,273 586
Combination - Interest Rate Reduction and Other-Than-Insignificant Payment Delays | Mortgages    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 0 0
Combination - Interest Rate Reduction and Other-Than-Insignificant Payment Delays | Commercial | CRE owner occupied    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date   0
Combination - Interest Rate Reduction and Other-Than-Insignificant Payment Delays | Commercial | Commercial and Industrial    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 140 132
Combination - Interest Rate Reduction and Other-Than-Insignificant Payment Delays | Consumer | Credit card    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 1,133 454
Combination - Interest Rate Reduction and Other-Than-Insignificant Payment Delays | Consumer | Personal loans    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date $ 0 $ 0