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Allowance for Credit Losses - Summary of Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period $ 114,609 $ 61,479 $ 62,224 $ 60,996
Charge-offs (13,667) (4,700) (93,416) (13,391)
Recoveries 754 423 1,274 1,743
Net (Charge-offs)/Recoveries (12,913) (4,277) (92,142) (11,648)
Provision for credit losses on loans 19,302 4,913 123,564 12,767
Balance at End of Period 120,998 62,115 120,998 62,115
Commercial real estate | Commercial        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 57,730 32,836 30,577 33,707
Charge-offs (10,187) (2,304) (16,229) (2,833)
Recoveries 172 6 211 134
Net (Charge-offs)/Recoveries (10,015) (2,298) (16,018) (2,699)
Provision for credit losses on loans 23,839 1,292 52,185 822
Balance at End of Period 71,554 31,830 71,554 31,830
Commercial and industrial | Commercial        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 19,164 13,227 15,681 11,596
Charge-offs (1,196) (1,467) (72,692) (8,379)
Recoveries 398 210 420 718
Net (Charge-offs)/Recoveries (798) (1,257) (72,272) (7,661)
Provision for credit losses on loans (4,155) 2,397 62,949 10,432
Balance at End of Period 14,211 14,367 14,211 14,367
Commercial construction | Commercial        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 8,874 7,254 7,900 7,983
Charge-offs 0 0 0 0
Recoveries 1 1 22 4
Net (Charge-offs)/Recoveries 1 1 22 4
Provision for credit losses on loans (1,617) 620 2,712 (112)
Balance at End of Period 7,258 7,875 7,258 7,875
Consumer real estate | Consumer        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 11,585 6,571 6,337 6,187
Charge-offs (252) (404) (470) (815)
Recoveries 41 102 153 595
Net (Charge-offs)/Recoveries (211) (302) (317) (220)
Provision for credit losses on loans (797) 65 32 367
Balance at End of Period 10,577 6,334 10,577 6,334
Other consumer | Consumer        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period 2,852 1,591 1,729 1,523
Charge-offs (284) (525) (1,556) (1,364)
Recoveries 78 104 302 292
Net (Charge-offs)/Recoveries (206) (421) (1,254) (1,072)
Provision for credit losses on loans (40) 539 1,489 1,258
Balance at End of Period $ 2,606 $ 1,709 $ 2,606 $ 1,709