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Loans (Changes in the Allowance for Credit Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance $ 39,676 $ 52,420 $ 30,482
Charge-offs (16,720) (13,219) (21,625)
Recoveries 11,482 7,459 7,810
Provision (benefit) 10,975 (6,984) 26,159
Ending balance 45,413 39,676 52,420
Investment securities, past due 3,998,718 3,631,355  
Cumulative-Effect Adjustment [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance     9,594
Adjusted Balance [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance     40,076
Commercial Business [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 11,099 13,580 11,358
Charge-offs (312) (669) (9,093)
Recoveries 376 881 1,709
Provision (benefit) 1,422 (2,693) 9,852
Ending balance 12,585 11,099 13,580
Investment securities, past due 663,611 639,368  
Commercial Business [Member] | Cumulative-Effect Adjustment [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance     (246)
Commercial Business [Member] | Adjusted Balance [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance     11,112
Commercial Mortgage [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 14,777 21,763 5,681
Charge-offs (1,170) (3,999) (1,792)
Recoveries 2,023 185 37
Provision (benefit) (1,218) (3,172) 10,527
Ending balance 14,412 14,777 21,763
Investment securities, past due 1,683,814 1,415,486  
Commercial Mortgage [Member] | Cumulative-Effect Adjustment [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance     7,310
Commercial Mortgage [Member] | Adjusted Balance [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance     12,991
Residential Real Estate Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 1,604 3,924 1,059
Charge-offs (303) (148) (100)
Recoveries 24 92 28
Provision (benefit) 1,976 (2,264) (353)
Ending balance 3,301 1,604 3,924
Investment securities, past due 576,279 563,579  
Residential Real Estate Loans [Member] | Cumulative-Effect Adjustment [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance     3,290
Residential Real Estate Loans [Member] | Adjusted Balance [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance     4,349
Residential Real Estate Lines [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 379 674 118
Charge-offs (38) (141) 0
Recoveries 39 0 3
Provision (benefit) 228 (154) (54)
Ending balance 608 379 674
Investment securities, past due 74,432 75,515  
Residential Real Estate Lines [Member] | Cumulative-Effect Adjustment [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance     607
Residential Real Estate Lines [Member] | Adjusted Balance [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance     725
Consumer Indirect [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 11,611 12,165 11,852
Charge-offs (13,215) (7,236) (9,959)
Recoveries 8,677 5,980 5,681
Provision (benefit) 7,165 702 5,825
Ending balance 14,238 11,611 12,165
Investment securities, past due 985,580 923,052  
Consumer Indirect [Member] | Cumulative-Effect Adjustment [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance     (1,234)
Consumer Indirect [Member] | Adjusted Balance [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance     10,618
Other Consumer [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 206 314 414
Charge-offs (1,682) (1,026) (681)
Recoveries 343 321 352
Provision (benefit) 1,402 597 362
Ending balance 269 206 314
Investment securities, past due $ 15,002 $ 14,355  
Other Consumer [Member] | Cumulative-Effect Adjustment [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance     (133)
Other Consumer [Member] | Adjusted Balance [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance     $ 281