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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Activity in allowance for credit losses by portfolio segment [Roll Forward]        
Balance, beginning of period $ 93,600 $ 98,500 $ 92,000 $ 110,000
Charge-offs (4,693) (4,887) (13,230) (13,556)
Recoveries 3,409 2,729 8,560 7,910
Provision 4,484 (3,342) 9,470 (11,354)
Balance, end of period 96,800 93,000 96,800 93,000
Commercial Loans [Member]        
Activity in allowance for credit losses by portfolio segment [Roll Forward]        
Balance, beginning of period 32,358 44,191 28,941 50,942
Charge-offs (624) (1,492) (1,659) (2,123)
Recoveries 1,282 354 2,212 533
Provision (60) (9,875) 3,462 (16,174)
Balance, end of period 32,956 33,178 32,956 33,178
Consumer Loans [Member]        
Activity in allowance for credit losses by portfolio segment [Roll Forward]        
Balance, beginning of period 44,940 34,881 44,253 37,803
Charge-offs (3,951) (3,083) (11,051) (10,702)
Recoveries 1,924 2,143 5,693 6,506
Provision 5,397 7,130 9,415 7,464
Balance, end of period 48,310 41,071 48,310 41,071
Residential [Member]        
Activity in allowance for credit losses by portfolio segment [Roll Forward]        
Balance, beginning of period 16,302 19,428 18,806 21,255
Charge-offs (118) (312) (520) (731)
Recoveries 203 232 655 871
Provision (853) (597) (3,407) (2,644)
Balance, end of period $ 15,534 $ 18,751 $ 15,534 $ 18,751