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Allowance for Credit Losses and Credit Quality of Loans, Allowance for Credit Losses on Off-Balance Sheet Credit Exposures (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for Credit Losses and Credit Quality of Loans [Abstract]        
Allowance for credit losses [1] $ 110,000      
Allowance for credit losses   $ 72,965 [1] $ 72,505 $ 69,500
Unfunded Commitment [Member]        
Allowance for Credit Losses and Credit Quality of Loans [Abstract]        
Allowance for credit losses $ 6,400      
Allowance for credit losses   $ 900    
[1] Beginning January 1, 2020, calculation is based on current expected loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.