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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
Mar. 31, 2021
Mar. 31, 2020
Activity in allowance for credit losses by portfolio segment [Roll Forward]    
Balance, beginning of period $ 110,000 $ 75,999
Charge-offs (4,660) (8,226)
Recoveries 2,456 2,587
Provision (2,796) 29,640
Balance, end of period 105,000 100,000
Commercial Loans [Member]    
Activity in allowance for credit losses by portfolio segment [Roll Forward]    
Balance, beginning of period 50,942 27,156
Charge-offs (242) (1,020)
Recoveries 118 228
Provision (773) 15,848
Balance, end of period 50,045 42,212
Consumer Loans [Member]    
Activity in allowance for credit losses by portfolio segment [Roll Forward]    
Balance, beginning of period 37,803 32,122
Charge-offs (4,348) (6,891)
Recoveries 2,075 2,235
Provision (950) 10,080
Balance, end of period 34,580 37,546
Residential [Member]    
Activity in allowance for credit losses by portfolio segment [Roll Forward]    
Balance, beginning of period 21,255 16,721
Charge-offs (70) (315)
Recoveries 263 124
Provision (1,073) 3,712
Balance, end of period $ 20,375 $ 20,242