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Allowance for credit losses - Amortized Cost Basis of Modified Financing Receivables That Subsequently Defaulted (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | $ 9,279 | $ 7,685 | $ 18,525 | $ 25,306
Mortgages |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 6,826 | 6,957 | 14,855 | 14,585
Commercial | CRE non-owner occupied |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 311 |  | 438 |
Commercial | CRE owner occupied |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date |  | 89 | 176 | 625
Commercial | Commercial and Industrial |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 513 | 51 | 758 | 9,197
Consumer | Credit card |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 1,208 | 242 | 1,738 | 339
Consumer | Personal loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 421 | 346 | 560 | 560
Interest Rate Reduction |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 733 | 415 | 1,016 | 551
Interest Rate Reduction | Mortgages |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 0 | 0 | 0 | 0
Interest Rate Reduction | Commercial | CRE non-owner occupied |  |  |  |
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 | 0
Interest Rate Reduction | Commercial | Commercial and Industrial |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 110 | 6 | 166 | 6
Interest Rate Reduction | Consumer | Credit card |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 270 | 223 | 440 | 285
Interest Rate Reduction | Consumer | Personal loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 353 | 186 | 410 | 260
Extension of maturity date |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 6,152 | 5,998 | 12,960 | 21,989
Extension of maturity date | Mortgages |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 6,021 | 5,911 | 12,784 | 12,281
Extension of maturity date | Commercial | CRE non-owner occupied |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 0 |  | 0 |
Extension of maturity date | Commercial | CRE owner occupied |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date |  | 0 | 0 | 536
Extension of maturity date | Commercial | Commercial and Industrial |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 131 | 45 | 131 | 9,130
Extension of maturity date | Consumer | Credit card |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 0 | 0 | 0 | 0
Extension of maturity date | Consumer | Personal loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 0 | 42 | 45 | 42
Other-Than-Insignificant Payment Delays |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 669 | 216 | 972 | 227
Other-Than-Insignificant Payment Delays | Mortgages |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 236 | 127 | 236 | 127
Other-Than-Insignificant Payment Delays | Commercial | CRE non-owner occupied |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 311 |  | 438 |
Other-Than-Insignificant Payment Delays | Commercial | CRE owner occupied |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date |  | 89 | 176 | 89
Other-Than-Insignificant Payment Delays | Commercial | Commercial and Industrial |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 122 | 0 | 122 | 11
Other-Than-Insignificant Payment Delays | Consumer | Credit card |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 0 | 0 | 0 | 0
Other-Than-Insignificant Payment Delays | Consumer | Personal loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 0 | 0 | 0 | 0
Combination of reduction of interest rate and extension of maturity |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 637 | 1,037 | 1,940 | 2,435
Combination of reduction of interest rate and extension of maturity | Mortgages |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 569 | 919 | 1,835 | 2,177
Combination of reduction of interest rate and extension of maturity | Commercial | CRE non-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 | CRE owner occupied |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date |  | 0 | 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 | 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 | 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 | 68 | 118 | 105 | 258
Combination - Interest Rate Reduction and Other-Than-Insignificant Payment Delays |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date | 1,088 | 19 | 1,637 | 104
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 | 0 | 0
Combination - Interest Rate Reduction and Other-Than-Insignificant Payment Delays | Commercial | CRE non-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 | CRE owner occupied |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recorded investment as of first default date |  | 0 | 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 | 150 | 0 | 339 | 50
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 | 938 | 19 | 1,298 | 54
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 | $ 0 | $ 0

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