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Loans and Allowance for Credit Losses Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance $ 291,940 $ 166,209 $ 166,209
Loans charged off 8,202 14,003  
Recoveries of loans previously charged off 2,021 2,887  
Total net (charge-offs) recoveries (6,181) (11,116)  
Provision for credit losses (5,500) 44,029  
Ending balance 280,259 257,471 291,940
Cumulative Effect, Period of Adoption, Adjustment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 0 58,349 58,349
Ending balance     0
Loans - Excluding OBS Credit Exposure [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 277,567 163,622 163,622
Loans charged off 8,202 14,003  
Recoveries of loans previously charged off 2,021 2,887  
Total net (charge-offs) recoveries (6,181) (11,116)  
Provision for credit losses (5,400) 40,279  
Ending balance 265,986 238,508 277,567
Loans - Excluding OBS Credit Exposure [Member] | Real estate - commercial mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 103,425 45,610 45,610
Loans charged off 1,837 855  
Recoveries of loans previously charged off 174 244  
Total net (charge-offs) recoveries (1,663) (611)  
Provision for credit losses (786) 15,959  
Ending balance 100,976 90,319 103,425
Loans - Excluding OBS Credit Exposure [Member] | Commercial and industrial (1)      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 74,771 68,602 68,602
Loans charged off 4,319 10,899  
Recoveries of loans previously charged off 769 1,734  
Total net (charge-offs) recoveries (3,550) (9,165)  
Provision for credit losses (27) 22,745  
Ending balance 71,194 63,606 74,771
Loans - Excluding OBS Credit Exposure [Member] | Real-estate - home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 14,232 17,744 17,744
Loans charged off 212 316  
Recoveries of loans previously charged off 51 646  
Total net (charge-offs) recoveries (161) 330  
Provision for credit losses (341) (2,756)  
Ending balance 13,730 15,253 14,232
Loans - Excluding OBS Credit Exposure [Member] | Real estate - residential mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 51,995 19,771 19,771
Loans charged off 192 187  
Recoveries of loans previously charged off 95 85  
Total net (charge-offs) recoveries (97) (102)  
Provision for credit losses (1,903) 1,523  
Ending balance 49,995 42,427 51,995
Loans - Excluding OBS Credit Exposure [Member] | Real-estate - construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 15,608 4,443 4,443
Loans charged off 39 0  
Recoveries of loans previously charged off 384 70  
Total net (charge-offs) recoveries 345 70  
Provision for credit losses (874) (130)  
Ending balance 15,079 8,398 15,608
Loans - Excluding OBS Credit Exposure [Member] | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 10,905 3,762 3,762
Loans charged off 635 1,213  
Recoveries of loans previously charged off 389 0  
Total net (charge-offs) recoveries (246) (1,213)  
Provision for credit losses (1,247) 1,347  
Ending balance 9,412 9,865 10,905
Loans - Excluding OBS Credit Exposure [Member] | Equipment lease financing, other and overdrafts      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance 6,633 3,690 3,690
Loans charged off 968 533  
Recoveries of loans previously charged off 159 108  
Total net (charge-offs) recoveries (809) (425)  
Provision for credit losses (222) 1,591  
Ending balance $ 5,602 8,640 6,633
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