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Allowance for Credit Losses and Credit Quality of Loans, Allowance for Loan Losses by Portfolio Segments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Activity in allowance for credit losses by portfolio segment [Roll Forward]  
Balance, end of period $ 110,000 [1]
ASU 2016-13 [Member]  
Activity in allowance for credit losses by portfolio segment [Roll Forward]  
Balance, beginning of period 75,999
Charge-offs (27,078)
Recoveries 9,945
Provision 51,134
Balance, end of period 110,000
Commercial Loans [Member] | ASU 2016-13 [Member]  
Activity in allowance for credit losses by portfolio segment [Roll Forward]  
Balance, beginning of period 27,156
Charge-offs (4,005)
Recoveries 786
Provision 27,005
Balance, end of period 50,942
Consumer Loans [Member] | ASU 2016-13 [Member]  
Activity in allowance for credit losses by portfolio segment [Roll Forward]  
Balance, beginning of period 32,122
Charge-offs (21,938)
Recoveries 8,541
Provision 19,078
Balance, end of period 37,803
Residential Real Estate [Member] | ASU 2016-13 [Member]  
Activity in allowance for credit losses by portfolio segment [Roll Forward]  
Balance, beginning of period 16,721
Charge-offs (1,135)
Recoveries 618
Provision 5,051
Balance, end of period $ 21,255
[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.