Allowance for credit losses - Quantitative information by loan class for loans modified as T D R (Details) $ in Thousands	12 Months Ended
Dec. 31, 2022 USD ($) loans
Financing Receivable, Modifications [Line Items]
Loan count \| loans	1,706
Pre-Modification Recorded Investment	$ 212,954
Post Modification Recorded Investment	209,928
Increase (decrease) in the allowance for loan losses as a result of modification	$ 5,316
Mortgages
Financing Receivable, Modifications [Line Items]
Loan count \| loans	1,110
Pre-Modification Recorded Investment	$ 128,581
Post Modification Recorded Investment	125,875
Increase (decrease) in the allowance for loan losses as a result of modification	$ 4,447
Commercial \| CRE non-owner occupied
Financing Receivable, Modifications [Line Items]
Loan count \| loans	8
Pre-Modification Recorded Investment	$ 6,530
Post Modification Recorded Investment	6,527
Increase (decrease) in the allowance for loan losses as a result of modification	$ 60
Commercial \| CRE owner occupied
Financing Receivable, Modifications [Line Items]
Loan count \| loans	28
Pre-Modification Recorded Investment	$ 19,192
Post Modification Recorded Investment	19,165
Increase (decrease) in the allowance for loan losses as a result of modification	$ (2,078)
Commercial \| Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Loan count \| loans	30
Pre-Modification Recorded Investment	$ 51,139
Post Modification Recorded Investment	50,929
Increase (decrease) in the allowance for loan losses as a result of modification	$ 2,120
Consumer \| Credit card
Financing Receivable, Modifications [Line Items]
Loan count \| loans	96
Pre-Modification Recorded Investment	$ 866
Post Modification Recorded Investment	898
Increase (decrease) in the allowance for loan losses as a result of modification	$ 10
Consumer \| Home equity lines of credit
Financing Receivable, Modifications [Line Items]
Loan count \| loans	1
Pre-Modification Recorded Investment	$ 245
Post Modification Recorded Investment	236
Increase (decrease) in the allowance for loan losses as a result of modification	$ 67
Consumer \| Personal loans
Financing Receivable, Modifications [Line Items]
Loan count \| loans	265
Pre-Modification Recorded Investment	$ 3,581
Post Modification Recorded Investment	3,479
Increase (decrease) in the allowance for loan losses as a result of modification	$ 671
Consumer \| Auto Loan
Financing Receivable, Modifications [Line Items]
Loan count \| loans	130
Pre-Modification Recorded Investment	$ 1,631
Post Modification Recorded Investment	1,631
Increase (decrease) in the allowance for loan losses as a result of modification	$ 5
Consumer \| Other
Financing Receivable, Modifications [Line Items]
Loan count \| loans	1
Pre-Modification Recorded Investment	$ 8
Post Modification Recorded Investment	8
Increase (decrease) in the allowance for loan losses as a result of modification	$ 1
Leasing
Financing Receivable, Modifications [Line Items]
Loan count \| loans	37
Pre-Modification Recorded Investment	$ 1,181
Post Modification Recorded Investment	1,180
Increase (decrease) in the allowance for loan losses as a result of modification	$ 13

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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