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Allowance for Credit Losses - Schedule of Detail in Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 39,892 $ 43,410 $ 39,771
Provision (credit) for credit loss expense 16,151 1,366 3,942
Recoveries 631 906 2,137
Charge-offs (2,471) (5,790) (2,440)
Ending Balance 51,669 39,892 43,410
Commercial and industrial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 10,541 11,272  
Provision (credit) for credit loss expense 577 (138)  
Recoveries 131 103  
Charge-offs (2) (696)  
Ending Balance 9,239 10,541 11,272
Commercial real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 21,608 23,483  
Provision (credit) for credit loss expense 16,700 1,966  
Recoveries 58 174  
Charge-offs (1,903) (4,015)  
Ending Balance 30,546 21,608 23,483
Residential real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 6,381 7,345  
Provision (credit) for credit loss expense (693) (1,042)  
Recoveries 194 334  
Charge-offs (84) (256)  
Ending Balance 10,257 6,381 7,345
Consumer and other      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 1,362 1,310  
Provision (credit) for credit loss expense (416) 580  
Recoveries 248 295  
Charge-offs (482) (823)  
Ending Balance 1,562 1,362 1,310
Finance leases      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 0 0  
Provision (credit) for credit loss expense (17) 0  
Recoveries 0 0  
Charge-offs 0 0  
Ending Balance 65 0 0
Cumulative Effect, Adjustment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance (2,534) 0 0
Ending Balance 2,500 (2,534) $ 0
Cumulative Effect, Adjustment | Commercial and industrial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance (2,008)    
Ending Balance   (2,008)  
Cumulative Effect, Adjustment | Commercial real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance (5,917)    
Ending Balance   (5,917)  
Cumulative Effect, Adjustment | Residential real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 4,459    
Ending Balance   4,459  
Cumulative Effect, Adjustment | Consumer and other      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 850    
Ending Balance   850  
Cumulative Effect, Adjustment | Finance leases      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 82    
Ending Balance   $ 82