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Loans (Changes in the Allowance for Credit Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance $ 52,420 $ 30,482 $ 33,914
Charge-offs (13,219) (21,625) (17,811)
Recoveries 7,459 7,810 6,335
Provision (benefit) 6,984 26,159 8,044
Ending balance 39,676 52,420 30,482
Allowance for loan losses, Individually Evaluated for impairment     693
Allowance for loan losses, Collectively Evaluated for impairment     29,789
Allowance for loan losses, Individually Evaluated for impairment     4,323
Allowance for loan losses, Collectively Evaluated for impairment     3,175,142
Investment securities, past due 3,631,355 3,557,908 3,179,465
Cumulative-Effect Adjustment [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance   9,594  
Ending balance     9,594
Adjusted Balance [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance   40,076  
Ending balance     40,076
Commercial Business [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 13,580 11,358 14,312
Charge-offs (669) (9,093) (2,481)
Recoveries 881 1,709 492
Provision (benefit) 2,693 (9,852) (965)
Ending balance 11,099 13,580 11,358
Allowance for loan losses, Individually Evaluated for impairment     214
Allowance for loan losses, Collectively Evaluated for impairment     11,144
Allowance for loan losses, Individually Evaluated for impairment     1,177
Allowance for loan losses, Collectively Evaluated for impairment     570,045
Investment securities, past due 639,368 798,409 571,222
Commercial Business [Member] | Cumulative-Effect Adjustment [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance   (246)  
Ending balance     (246)
Commercial Business [Member] | Adjusted Balance [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance   11,112  
Ending balance     11,112
Commercial Mortgage [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 21,763 5,681 5,219
Charge-offs (3,999) (1,792) (2,997)
Recoveries 185 37 17
Provision (benefit) 3,172 10,527 3,442
Ending balance 14,777 21,763 5,681
Allowance for loan losses, Individually Evaluated for impairment     479
Allowance for loan losses, Collectively Evaluated for impairment     5,202
Allowance for loan losses, Individually Evaluated for impairment     3,146
Allowance for loan losses, Collectively Evaluated for impairment     1,105,169
Investment securities, past due 1,415,486 1,256,525 1,108,315
Commercial Mortgage [Member] | Cumulative-Effect Adjustment [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance   7,310  
Ending 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  
Ending balance     12,991
Residential Real Estate Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 3,924 1,059 1,112
Charge-offs (148) (100) (340)
Recoveries 92 28 43
Provision (benefit) (2,264) 353 244
Ending balance 1,604 3,924 1,059
Allowance for loan losses, Collectively Evaluated for impairment     1,059
Allowance for loan losses, Collectively Evaluated for impairment     560,717
Investment securities, past due 563,579 586,537 560,717
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  
Ending 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  
Ending balance     4,349
Residential Real Estate Lines [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 674 118 210
Charge-offs (141) 0 (13)
Recoveries 0 3 6
Provision (benefit) (154) (54) (85)
Ending balance 379 674 118
Allowance for loan losses, Collectively Evaluated for impairment     118
Allowance for loan losses, Collectively Evaluated for impairment     101,048
Investment securities, past due 75,515 86,708 101,048
Residential Real Estate Lines [Member] | Cumulative-Effect Adjustment [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance   607  
Ending 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  
Ending balance     725
Consumer Indirect [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 12,165 11,852 12,572
Charge-offs (7,236) (9,959) (10,810)
Recoveries 5,980 5,681 5,390
Provision (benefit) 702 5,825 4,700
Ending balance 11,611 12,165 11,852
Allowance for loan losses, Collectively Evaluated for impairment     11,852
Allowance for loan losses, Collectively Evaluated for impairment     822,179
Investment securities, past due 923,052 812,816 822,179
Consumer Indirect [Member] | Cumulative-Effect Adjustment [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance   (1,234)  
Ending 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  
Ending balance     10,618
Other Consumer [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 314 414 489
Charge-offs (1,026) (681) (1,170)
Recoveries 321 352 387
Provision (benefit) 597 362 708
Ending balance 206 314 414
Allowance for loan losses, Collectively Evaluated for impairment     414
Allowance for loan losses, Collectively Evaluated for impairment     15,984
Investment securities, past due $ 14,355 16,913 15,984
Other Consumer [Member] | Cumulative-Effect Adjustment [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance   (133)  
Ending balance     (133)
Other Consumer [Member] | Adjusted Balance [Member] | ASU 2016-13 [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance   $ 281  
Ending balance     $ 281