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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Activity in allowance for credit losses by portfolio segment [Roll Forward]    
Balance, end of period [1] $ 113,500 $ 113,500
ASU 2016-13 [Member]    
Activity in allowance for credit losses by portfolio segment [Roll Forward]    
Balance, beginning of period 100,000 75,999
Charge-offs (7,377) (15,603)
Recoveries 2,037 4,624
Provision 18,840 48,480
Balance, end of period 113,500 113,500
ASU 2016-13 [Member] | Commercial Loans [Member]    
Activity in allowance for credit losses by portfolio segment [Roll Forward]    
Balance, beginning of period 42,212 27,156
Charge-offs (709) (1,729)
Recoveries 113 341
Provision 8,770 24,618
Balance, end of period 50,386 50,386
ASU 2016-13 [Member] | Consumer Loans [Member]    
Activity in allowance for credit losses by portfolio segment [Roll Forward]    
Balance, beginning of period 37,546 32,122
Charge-offs (6,178) (13,069)
Recoveries 1,810 4,045
Provision 6,916 16,996
Balance, end of period 40,094 40,094
ASU 2016-13 [Member] | Residential [Member]    
Activity in allowance for credit losses by portfolio segment [Roll Forward]    
Balance, beginning of period 20,242 16,721
Charge-offs (490) (805)
Recoveries 114 238
Provision 3,154 6,866
Balance, end of period $ 23,020 $ 23,020
[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.