v3.25.1
Allowance for credit losses - Amortized Cost Basis of Modified Financing Receivables That Subsequently Defaulted (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date $ 6,737 $ 21,936
Mortgages    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 5,235 6,254
Commercial | CRE owner occupied    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 346 755
Commercial | Commercial and Industrial    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 361 14,643
Consumer | Credit card    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 632 182
Consumer | Personal loans    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 163 102
Interest Rate Reduction    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 344 145
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 0
Interest Rate Reduction | Commercial | Commercial and Industrial    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 81 26
Interest Rate Reduction | Consumer | Credit card    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 178 63
Interest Rate Reduction | Consumer | Personal loans    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 85 56
Extension of maturity date    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 4,984 20,046
Extension of maturity date | Mortgages    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 4,820 4,946
Extension of maturity date | Commercial | CRE owner occupied    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 89 755
Extension of maturity date | Commercial | Commercial and Industrial    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 64 14,345
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 11 0
Other-Than-Insignificant Payment Delays    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 341 256
Other-Than-Insignificant Payment Delays | Mortgages    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 0 0
Other-Than-Insignificant Payment Delays | Commercial | CRE owner occupied    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 257 0
Other-Than-Insignificant Payment Delays | Commercial | Commercial and Industrial    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 84 256
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 482 1,354
Combination of reduction of interest rate and extension of maturity | Mortgages    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 415 1,308
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 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 0 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 67 46
Combination - Interest Rate Reduction and Other-Than-Insignificant Payment Delays    
Financing Receivable, Modifications [Line Items]    
Recorded investment as of first default date 586 135
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 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 132 16
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 454 119
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