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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

X

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