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Loans - Schedule of allowance for credit loss (ACL) activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Allowance $ 66,468 $ 82,079
Charge-Offs 289 109
Recoveries 390 298
Provisions 626 (7,514)
Ending Allowance 67,195 74,754
Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Allowance 13,410 11,665
Charge-Offs 10 70
Recoveries 102 198
Provisions 319 398
Ending Allowance 13,821 12,191
Consumer Finance [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Allowance 1,405 1,983
Charge-Offs 103 36
Recoveries 114 27
Provisions (415) (148)
Ending Allowance 1,001 1,826
Residential Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Allowance 12,029 17,534
Charge-Offs 140
Recoveries 81 8
Provisions (330) (34)
Ending Allowance 11,640 17,508
Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Allowance 32,399 43,417
Charge-Offs 7
Recoveries 59 36
Provisions 1,750 (8,181)
Ending Allowance 34,201 35,272
Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Allowance 3,004 2,741
Charge-Offs
Recoveries
Provisions (391) 35
Ending Allowance 2,613 2,776
Home Equity and Improvement [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Allowance 4,221 4,739
Charge-Offs 29 3
Recoveries 34 29
Provisions (307) 416
Ending Allowance $ 3,919 $ 5,181