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Loans and Allowance for Credit Losses Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance     $ 249,001    
Loans charged off $ 1,618 $ 9,522 3,518 $ 17,724  
Recoveries of loans previously charged off 5,367 2,568 8,321 4,589  
Total net (charge-offs) recoveries 3,749 (6,954) 4,803 (13,135)  
Provision for credit losses 1,500 (3,500) (5,450) (9,000)  
Ending balance 248,564   248,564   $ 249,001
Loans - Excluding OBS Credit Exposure [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 243,705 265,986 249,001 277,567 277,567
Loans charged off 1,618 9,522 3,518 17,724  
Recoveries of loans previously charged off 5,367 2,568 8,321 4,589  
Total net (charge-offs) recoveries 3,749 (6,954) 4,803 (13,135)  
Provision for credit losses 1,110 (4,000) (5,240) (9,400)  
Ending balance 248,564 255,032 248,564 255,032 249,001
Loans - Excluding OBS Credit Exposure [Member] | Real estate - commercial mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 79,853 100,976 87,970 103,425 103,425
Loans charged off 0 6,506 152 8,343  
Recoveries of loans previously charged off 3,536 729 3,648 903  
Total net (charge-offs) recoveries 3,536 (5,777) 3,496 (7,440)  
Provision for credit losses (10,784) 182 (18,861) (604)  
Ending balance 72,605 95,381 72,605 95,381 87,970
Loans - Excluding OBS Credit Exposure [Member] | Commercial and Industrial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 66,511 71,194 67,056 74,771 74,771
Loans charged off 201 954 428 5,273  
Recoveries of loans previously charged off 739 693 2,719 1,462  
Total net (charge-offs) recoveries 538 (261) 2,291 (3,811)  
Provision for credit losses 5,070 (5,529) 2,772 (5,556)  
Ending balance 72,119 65,404 72,119 65,404 67,056
Loans - Excluding OBS Credit Exposure [Member] | Consumer and Real Estate Home Equity          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 20,213 23,142 19,749 25,137 25,137
Loans charged off 877 1,130 1,929 1,977  
Recoveries of loans previously charged off 762 634 1,216 1,074  
Total net (charge-offs) recoveries (115) (496) (713) (903)  
Provision for credit losses 2,982 (652) 4,044 (2,240)  
Ending balance 23,080 21,994 23,080 21,994 19,749
Loans - Excluding OBS Credit Exposure [Member] | Real estate - residential mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 55,892 49,995 54,236 51,995 51,995
Loans charged off 66 496 66 688  
Recoveries of loans previously charged off 92 105 314 200  
Total net (charge-offs) recoveries 26 (391) 248 (488)  
Provision for credit losses 5,717 4,584 7,151 2,681  
Ending balance 61,635 54,188 61,635 54,188 54,236
Loans - Excluding OBS Credit Exposure [Member] | Real-estate - construction          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 13,303 15,079 12,941 15,608 15,608
Loans charged off 0 0 0 39  
Recoveries of loans previously charged off 12 254 44 638  
Total net (charge-offs) recoveries 12 254 44 599  
Provision for credit losses (2,687) (2,679) (2,357) (3,553)  
Ending balance 10,628 12,654 10,628 12,654 12,941
Loans - Excluding OBS Credit Exposure [Member] | Equipment lease financing, other and overdrafts          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 7,933 5,600 7,049 6,631 6,631
Loans charged off 474 436 943 1,404  
Recoveries of loans previously charged off 226 153 380 312  
Total net (charge-offs) recoveries (248) (283) (563) (1,092)  
Provision for credit losses 812 94 2,011 (128)  
Ending balance $ 8,497 $ 5,411 $ 8,497 $ 5,411 $ 7,049