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Allowance for Credit Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Financing Receivable, Past Due [Line Items]            
Current $ 7,302,311   $ 7,302,311     $ 7,055,361
Past due 92,556   92,556     81,791
Non - performing 84,072   84,072     54,057
Total $ 7,394,868   $ 7,394,868     7,137,152
Number of loans | loan 14 22 34 46    
Restructured loans $ 4,562 $ 25,800 $ 11,586 $ 36,712    
CARES Act, Paycheck Protection Program Loans            
Financing Receivable, Past Due [Line Items]            
Restructured loans     350,000      
30 to 59 Days Past Due            
Financing Receivable, Past Due [Line Items]            
Past due 6,040   6,040     17,992
60 to 89 Days Past Due            
Financing Receivable, Past Due [Line Items]            
Past due 1,925   1,925     5,985
90 Days Past Due            
Financing Receivable, Past Due [Line Items]            
Past due 520   520     3,757
Commercial            
Financing Receivable, Past Due [Line Items]            
Total 5,810,034   5,810,034     5,512,796
Commercial | Commercial real estate            
Financing Receivable, Past Due [Line Items]            
Current 2,771,132   2,771,132     3,025,505
Past due 47,095   47,095     34,087
Non - performing 47,095   47,095     25,356
Total $ 2,818,227   $ 2,818,227   $ 3,416,518 3,059,592
Number of loans | loan 1 5 2 8    
Restructured loans $ 171 $ 23,784 $ 2,381 $ 29,747    
Commercial | Commercial and industrial            
Financing Receivable, Past Due [Line Items]            
Current 1,811,342   1,811,342     1,466,460
Past due 7,307   7,307     14,069
Non - performing 5,686   5,686     10,911
Total $ 1,818,649   $ 1,818,649   1,720,833 1,480,529
Number of loans | loan 2 2 5 3    
Restructured loans $ 4,022 $ 1,527 $ 5,381 $ 5,860    
Commercial | Commercial construction            
Financing Receivable, Past Due [Line Items]            
Current 469,356   469,356     367,204
Past due 1,504   1,504     2,856
Non - performing 1,504   1,504     737
Total $ 470,860   $ 470,860   375,445 370,060
Number of loans | loan 0   3      
Restructured loans $ 0   $ 2,561      
Commercial | Business banking            
Financing Receivable, Past Due [Line Items]            
Current 994,389   994,389     830,735
Past due 21,562   21,562     16,055
Non - performing 18,081   18,081     9,863
Total 1,015,951   1,015,951   0 846,790
Commercial | 30 to 59 Days Past Due | Commercial real estate            
Financing Receivable, Past Due [Line Items]            
Past due 0   0     7,749
Commercial | 30 to 59 Days Past Due | Commercial and industrial            
Financing Receivable, Past Due [Line Items]            
Past due 1,235   1,235     126
Commercial | 30 to 59 Days Past Due | Commercial construction            
Financing Receivable, Past Due [Line Items]            
Past due 0   0     956
Commercial | 30 to 59 Days Past Due | Business banking            
Financing Receivable, Past Due [Line Items]            
Past due 2,733   2,733     5,093
Commercial | 60 to 89 Days Past Due | Commercial real estate            
Financing Receivable, Past Due [Line Items]            
Past due 0   0     71
Commercial | 60 to 89 Days Past Due | Commercial and industrial            
Financing Receivable, Past Due [Line Items]            
Past due 0   0     1,589
Commercial | 60 to 89 Days Past Due | Commercial construction            
Financing Receivable, Past Due [Line Items]            
Past due 0   0     1,163
Commercial | 60 to 89 Days Past Due | Business banking            
Financing Receivable, Past Due [Line Items]            
Past due 748   748     1,099
Commercial | 90 Days Past Due | Commercial real estate            
Financing Receivable, Past Due [Line Items]            
Past due 0   0     911
Commercial | 90 Days Past Due | Commercial and industrial            
Financing Receivable, Past Due [Line Items]            
Past due 386   386     1,443
Commercial | 90 Days Past Due | Commercial construction            
Financing Receivable, Past Due [Line Items]            
Past due           0
Commercial | 90 Days Past Due | Business banking            
Financing Receivable, Past Due [Line Items]            
Past due 0   0     0
Consumer            
Financing Receivable, Past Due [Line Items]            
Total 1,584,834   1,584,834     1,624,356
Consumer | Commercial construction            
Financing Receivable, Past Due [Line Items]            
Total 15,343   15,343     8,390
Consumer | Consumer real estate            
Financing Receivable, Past Due [Line Items]            
Current 1,177,782   1,177,782     1,283,591
Past due 12,698   12,698     11,616
Non - performing 9,810   9,810     6,063
Total 1,190,480   1,190,480   1,545,323 1,295,207
Consumer | Other consumer            
Financing Receivable, Past Due [Line Items]            
Current 78,310   78,310     81,866
Past due 2,391   2,391     3,108
Non - performing 1,896   1,896     1,127
Total 80,701   80,701   $ 79,033 84,974
Consumer | 30 to 59 Days Past Due | Consumer real estate            
Financing Receivable, Past Due [Line Items]            
Past due 1,723   1,723     2,620
Consumer | 30 to 59 Days Past Due | Other consumer            
Financing Receivable, Past Due [Line Items]            
Past due 349   349     1,448
Consumer | 60 to 89 Days Past Due | Consumer real estate            
Financing Receivable, Past Due [Line Items]            
Past due 1,031   1,031     1,758
Consumer | 60 to 89 Days Past Due | Other consumer            
Financing Receivable, Past Due [Line Items]            
Past due 146   146     305
Consumer | 90 Days Past Due | Consumer real estate            
Financing Receivable, Past Due [Line Items]            
Past due 134   134     1,175
Consumer | 90 Days Past Due | Other consumer            
Financing Receivable, Past Due [Line Items]            
Past due $ 0   $ 0     $ 228