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Allowance for Credit Losses and Credit Quality of Loans, Allowance for Credit Losses by Portfolio Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Activity in allowance for credit losses by portfolio segment [Roll Forward]    
Balance, end of period [1] $ 114,500 $ 114,500
ASU 2016-13 [Member]    
Activity in allowance for credit losses by portfolio segment [Roll Forward]    
Balance, beginning of period 113,500 75,999
Charge-offs (4,779) (20,382)
Recoveries 2,518 7,142
Provision 3,261 51,741
Balance, end of period 114,500 114,500
ASU 2016-13 [Member] | Commercial Loans [Member]    
Activity in allowance for credit losses by portfolio segment [Roll Forward]    
Balance, beginning of period 50,386 27,156
Charge-offs (624) (2,353)
Recoveries 333 674
Provision 1,651 26,269
Balance, end of period 51,746 51,746
ASU 2016-13 [Member] | Consumer Loans [Member]    
Activity in allowance for credit losses by portfolio segment [Roll Forward]    
Balance, beginning of period 40,094 32,122
Charge-offs (4,097) (17,166)
Recoveries 2,123 6,168
Provision 442 17,438
Balance, end of period 38,562 38,562
ASU 2016-13 [Member] | Residential [Member]    
Activity in allowance for credit losses by portfolio segment [Roll Forward]    
Balance, beginning of period 23,020 16,721
Charge-offs (58) (863)
Recoveries 62 300
Provision 1,168 8,034
Balance, end of period $ 24,192 $ 24,192
[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.