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Loans and Allowance for Credit Losses Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance     $ 277,567    
Loans charged off $ 2,234 $ 5,489 19,958 $ 27,539  
Recoveries of loans previously charged off 4,539 7,847 9,128 14,660  
Total net (charge-offs) recoveries 2,305 2,358 (10,830) (12,879)  
Provision for credit losses (600) 7,080 (9,600) 70,680  
Ending balance 256,727   256,727   $ 277,567
Loans - Excluding OBS Credit Exposure [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 255,032 256,537 277,567 163,622 163,622
Loans charged off 2,234 5,490 19,958 27,540  
Recoveries of loans previously charged off 4,539 7,847 9,128 14,660  
Total net (charge-offs) recoveries 2,305 2,357 (10,830) (12,880)  
Provision for credit losses (610) 7,931 (10,010) 70,360  
Ending balance 256,727 266,825 256,727 266,825 277,567
Loans - Excluding OBS Credit Exposure [Member] | Real estate - commercial mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 95,381 102,695 103,425 45,610 45,610
Loans charged off 14 746 8,357 3,925  
Recoveries of loans previously charged off 564 100 1,467 439  
Total net (charge-offs) recoveries 550 (646) (6,890) (3,486)  
Provision for credit losses 234 9,806 (370) 40,370  
Ending balance 96,165 111,855 96,165 111,855 103,425
Loans - Excluding OBS Credit Exposure [Member] | Commercial and industrial (1)          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 65,404 61,447 74,771 68,602 68,602
Loans charged off 647 2,969 5,920 17,348  
Recoveries of loans previously charged off 2,330 2,103 3,792 6,815  
Total net (charge-offs) recoveries 1,683 (866) (2,128) (10,533)  
Provision for credit losses (4,196) (1,743) (9,752) 19,345  
Ending balance 62,891 58,838 62,891 58,838 74,771
Loans - Excluding OBS Credit Exposure [Member] | Real-estate - home equity          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 12,593 16,391 14,232 17,744 17,744
Loans charged off 58 393 482 1,138  
Recoveries of loans previously charged off 78 44 187 305  
Total net (charge-offs) recoveries 20 (349) (295) (833)  
Provision for credit losses (202) 256 (1,526) (548)  
Ending balance 12,411 16,298 12,411 16,298 14,232
Loans - Excluding OBS Credit Exposure [Member] | Real estate - residential mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 54,188 46,443 51,995 19,771 19,771
Loans charged off 602 198 1,290 620  
Recoveries of loans previously charged off 86 95 286 292  
Total net (charge-offs) recoveries (516) (103) (1,004) (328)  
Provision for credit losses 2,557 2,013 5,238 7,675  
Ending balance 56,229 48,353 56,229 48,353 51,995
Loans - Excluding OBS Credit Exposure [Member] | Real-estate - construction          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 12,654 12,314 15,608 4,443 4,443
Loans charged off 0 0 39 17  
Recoveries of loans previously charged off 697 4,873 1,335 4,943  
Total net (charge-offs) recoveries 697 4,873 1,296 4,926  
Provision for credit losses (930) (2,177) (4,483) 1,626  
Ending balance 12,421 15,010 12,421 15,010 15,608
Loans - Excluding OBS Credit Exposure [Member] | Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 9,401 10,299 10,905 3,762 3,762
Loans charged off 446 701 1,999 2,788  
Recoveries of loans previously charged off 426 447 1,391 1,481  
Total net (charge-offs) recoveries (20) (254) (608) (1,307)  
Provision for credit losses (324) 260 (1,240) 1,881  
Ending balance 9,057 10,305 9,057 10,305 10,905
Loans - Excluding OBS Credit Exposure [Member] | Equipment lease financing, other and overdrafts          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance 5,411 6,948 6,631 3,690 3,690
Loans charged off 467 483 1,871 1,704  
Recoveries of loans previously charged off 358 185 670 385  
Total net (charge-offs) recoveries (109) (298) (1,201) (1,319)  
Provision for credit losses 2,251 (484) 2,123 11  
Ending balance $ 7,553 $ 6,166 $ 7,553 6,166 6,631
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance       45,723 45,723
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Real estate - commercial mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance       29,361 29,361
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Commercial and industrial (1)          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance       (18,576) (18,576)
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Real-estate - home equity          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance       (65) (65)
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Real estate - residential mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance       21,235 21,235
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Real-estate - construction          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance       4,015 4,015
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance       5,969 5,969
Loans - Excluding OBS Credit Exposure [Member] | Cumulative Effect, Period of Adoption, Adjustment | Equipment lease financing, other and overdrafts          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning balance       $ 3,784 $ 3,784