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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Activity in allowance for credit losses by portfolio segment [Roll Forward]        
Balance, beginning of period $ 100,400 $ 93,600 $ 100,800 $ 92,000
Allowance for credit loss on PCD acquired loans 5,772      
Charge-offs (6,321) (4,693) (17,320) (13,230)
Recoveries 2,117 3,409   8,560
Provision 12,633 4,484 20,148 9,470
Balance, end of period 114,601 96,800 114,601 96,800
ASU 2022-02 [Member]        
Activity in allowance for credit losses by portfolio segment [Roll Forward]        
Balance, beginning of period     100,152  
Allowance for credit loss on PCD acquired loans     5,772  
Charge-offs     (17,320)  
Recoveries     5,849  
Provision     20,148  
Balance, end of period 114,601   114,601  
Commercial Loans [Member]        
Activity in allowance for credit losses by portfolio segment [Roll Forward]        
Balance, beginning of period 36,963 32,358   28,941
Allowance for credit loss on PCD acquired loans 5,300      
Charge-offs (138) (624)   (1,659)
Recoveries 474 1,282   2,212
Provision 4,121 (60)   3,462
Balance, end of period 46,720 32,956 46,720 32,956
Commercial Loans [Member] | ASU 2022-02 [Member]        
Activity in allowance for credit losses by portfolio segment [Roll Forward]        
Balance, beginning of period     34,662  
Allowance for credit loss on PCD acquired loans     5,300  
Charge-offs     (514)  
Recoveries     1,112  
Provision     6,160  
Balance, end of period 46,720   46,720  
Consumer Loans [Member]        
Activity in allowance for credit losses by portfolio segment [Roll Forward]        
Balance, beginning of period 47,883 44,940   44,253
Allowance for credit loss on PCD acquired loans 19      
Charge-offs (6,167) (3,951)   (11,051)
Recoveries 1,549 1,924   5,693
Provision 3,990 5,397   9,415
Balance, end of period 47,274 48,310 47,274 48,310
Consumer Loans [Member] | ASU 2022-02 [Member]        
Activity in allowance for credit losses by portfolio segment [Roll Forward]        
Balance, beginning of period     50,951  
Allowance for credit loss on PCD acquired loans     19  
Charge-offs     (16,346)  
Recoveries     4,367  
Provision     8,283  
Balance, end of period 47,274   47,274  
Residential [Member]        
Activity in allowance for credit losses by portfolio segment [Roll Forward]        
Balance, beginning of period 15,554 16,302   18,806
Allowance for credit loss on PCD acquired loans 453      
Charge-offs (16) (118) (460) (520)
Recoveries 94 203   655
Provision 4,522 (853)   (3,407)
Balance, end of period 20,607 $ 15,534 20,607 $ 15,534
Residential [Member] | ASU 2022-02 [Member]        
Activity in allowance for credit losses by portfolio segment [Roll Forward]        
Balance, beginning of period     14,539  
Allowance for credit loss on PCD acquired loans     453  
Charge-offs     (460)  
Recoveries     370  
Provision     5,705  
Balance, end of period $ 20,607   $ 20,607