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Allowance for Credit Losses and Credit Quality of Loans, Changes in Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Changes in allowance for loan losses by portfolio segment [Roll Forward]        
Balance, beginning of period   $ 71,405 $ 72,965 [1] $ 72,505
Charge-offs   (8,432)   (16,886)
Recoveries   1,915   3,462
Provision [1] $ 18,840 7,277 48,480 13,084
Balance, end of period   72,165   72,165
Commercial Loans [Member]        
Changes in allowance for loan losses by portfolio segment [Roll Forward]        
Balance, beginning of period   32,159 34,525 32,759
Charge-offs   (1,171)   (1,918)
Recoveries   118   212
Provision   2,046   2,099
Balance, end of period   33,152   33,152
Consumer Loans [Member]        
Changes in allowance for loan losses by portfolio segment [Roll Forward]        
Balance, beginning of period   36,804 35,647 37,178
Charge-offs   (6,927)   (14,360)
Recoveries   1,742   3,141
Provision   4,915   10,575
Balance, end of period   36,534   36,534
Residential Real Estate [Member]        
Changes in allowance for loan losses by portfolio segment [Roll Forward]        
Balance, beginning of period   2,442 $ 2,793 2,568
Charge-offs   (334)   (608)
Recoveries   55   109
Provision   316   410
Balance, end of period   $ 2,479   $ 2,479
[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.