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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 12 Months Ended
Mar. 31, 2021
USD ($)
loan
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
Financing Receivable, Past Due [Line Items]        
Current $ 7,047,844   $ 7,069,730  
Past due 135,324   156,130  
Non - performing 132,413   146,774 $ 54,057
Total 7,183,168   7,225,860  
Financing receivable, nonaccrual, including held-for-sale 135,200      
Restructured loans 6,865 $ 1,897    
30 to 59 Days Past Due        
Financing Receivable, Past Due [Line Items]        
Past due 2,737   2,888  
60 to 89 Days Past Due        
Financing Receivable, Past Due [Line Items]        
Past due 174   5,965  
90 Days Past Due        
Financing Receivable, Past Due [Line Items]        
Past due 0   503  
Commercial        
Financing Receivable, Past Due [Line Items]        
Total $ 5,676,683   $ 5,673,707  
Commercial | CARES Act, Paycheck Protection Program Loans        
Financing Receivable, Past Due [Line Items]        
Number of modified loans | loan 40   52  
Restructured loans $ 61,800      
Commercial | Commercial real estate        
Financing Receivable, Past Due [Line Items]        
Current 2,685,253   $ 2,690,877  
Past due 95,074   101,070  
Non - performing 95,074   101,070 25,356
Total 2,780,327   2,791,947  
Restructured loans 0 0    
Commercial | Commercial and industrial        
Financing Receivable, Past Due [Line Items]        
Current 1,687,172   1,542,567  
Past due 12,416   16,985  
Non - performing 12,416   16,985 10,911
Total 1,699,588   1,559,552  
Financing receivable, nonaccrual, held-for-sale 2,800      
Restructured loans 6,296 0    
Commercial | Commercial construction        
Financing Receivable, Past Due [Line Items]        
Current 449,074   462,094  
Past due 384   3,983  
Non - performing 384   384 737
Total 449,459   466,077  
Restructured loans 0 1,806    
Commercial | Business banking        
Financing Receivable, Past Due [Line Items]        
Current 1,053,430   1,140,581  
Past due 15,647   19,486  
Non - performing 14,426   17,122 9,863
Total 1,069,078   1,160,067  
Restructured loans 0 0    
Commercial | 30 to 59 Days Past Due | Commercial real estate        
Financing Receivable, Past Due [Line Items]        
Past due 0   0  
Commercial | 30 to 59 Days Past Due | Commercial and industrial        
Financing Receivable, Past Due [Line Items]        
Past due 0   0  
Commercial | 30 to 59 Days Past Due | Commercial construction        
Financing Receivable, Past Due [Line Items]        
Past due 0   19  
Commercial | 30 to 59 Days Past Due | Business banking        
Financing Receivable, Past Due [Line Items]        
Past due 1,191   1,614  
Commercial | 60 to 89 Days Past Due | Commercial real estate        
Financing Receivable, Past Due [Line Items]        
Past due 0   0  
Commercial | 60 to 89 Days Past Due | Commercial and industrial        
Financing Receivable, Past Due [Line Items]        
Past due 0   0  
Commercial | 60 to 89 Days Past Due | Commercial construction        
Financing Receivable, Past Due [Line Items]        
Past due 0   3,580  
Commercial | 60 to 89 Days Past Due | Business banking        
Financing Receivable, Past Due [Line Items]        
Past due 30   379  
Commercial | 90 Days Past Due | Commercial real estate        
Financing Receivable, Past Due [Line Items]        
Past due 0   0  
Commercial | 90 Days Past Due | Commercial and industrial        
Financing Receivable, Past Due [Line Items]        
Past due 0   0  
Commercial | 90 Days Past Due | Commercial construction        
Financing Receivable, Past Due [Line Items]        
Past due 0   0  
Commercial | 90 Days Past Due | Business banking        
Financing Receivable, Past Due [Line Items]        
Past due 0   371  
Consumer        
Financing Receivable, Past Due [Line Items]        
Total 1,506,485   1,552,153  
Consumer | Business banking        
Financing Receivable, Past Due [Line Items]        
Total 321,800   303,900  
Consumer | Consumer real estate        
Financing Receivable, Past Due [Line Items]        
Current 1,094,601   1,153,028  
Past due 9,498   14,304  
Non - performing 7,949   11,117 6,063
Total 1,104,099   1,167,332  
Restructured loans 568 91    
Consumer | Other consumer        
Financing Receivable, Past Due [Line Items]        
Current 78,314   80,583  
Past due 2,304   302  
Non - performing 2,163   96 $ 1,127
Total 80,618   80,885  
Restructured loans 1 $ 0    
Consumer | 30 to 59 Days Past Due | Consumer real estate        
Financing Receivable, Past Due [Line Items]        
Past due 1,444   1,087  
Consumer | 30 to 59 Days Past Due | Other consumer        
Financing Receivable, Past Due [Line Items]        
Past due 102   168  
Consumer | 60 to 89 Days Past Due | Consumer real estate        
Financing Receivable, Past Due [Line Items]        
Past due 104   1,968  
Consumer | 60 to 89 Days Past Due | Other consumer        
Financing Receivable, Past Due [Line Items]        
Past due 39   37  
Consumer | 90 Days Past Due | Consumer real estate        
Financing Receivable, Past Due [Line Items]        
Past due 0   132  
Consumer | 90 Days Past Due | Other consumer        
Financing Receivable, Past Due [Line Items]        
Past due $ 0   $ 0