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Loans (Recorded Investment by Loan Class in Current and Nonaccrual Loans) (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans $ 4,461,468 $ 4,462,139
Financing Receivable, Allowance for Credit Loss, Current 4,377,897 4,360,265
Investment securities, nonaccrual 25,173 26,639
Nonaccrual with no allowance 19,346 21,316
30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 13,952 25,268
60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 2,056 4,058
Greater than 90 Days [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 36 21
Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 16,044 29,347
Total Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 4,419,114 4,416,251
Commercial Business [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 713,947 735,700
Financing Receivable, Allowance for Credit Loss, Current 707,164 728,942
Investment securities, nonaccrual 5,680 5,664
Nonaccrual with no allowance 277 341
Commercial Business [Member] | 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 135 341
Commercial Business [Member] | 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 213 0
Commercial Business [Member] | Greater than 90 Days [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 0 0
Commercial Business [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 348 341
Commercial Business [Member] | Total Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 713,192 734,947
Commercial Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 2,085,870 2,005,319
Financing Receivable, Allowance for Credit Loss, Current 2,076,195 1,992,079
Investment securities, nonaccrual 10,452 10,563
Nonaccrual with no allowance 10,028 10,563
Commercial Mortgage [Member] | 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 2,371 5,900
Commercial Mortgage [Member] | 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 0 727
Commercial Mortgage [Member] | Greater than 90 Days [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 0 0
Commercial Mortgage [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 2,371 6,627
Commercial Mortgage [Member] | Total Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 2,089,018 2,009,269
Residential Real Estate Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 647,675 649,822
Financing Receivable, Allowance for Credit Loss, Current 628,269 628,115
Investment securities, nonaccrual 5,961 6,364
Nonaccrual with no allowance 5,961 6,364
Residential Real Estate Loans [Member] | 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 1,370 2,614
Residential Real Estate Loans [Member] | 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 117 80
Residential Real Estate Loans [Member] | Greater than 90 Days [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 0 0
Residential Real Estate Loans [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 1,487 2,694
Residential Real Estate Loans [Member] | Total Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 635,717 637,173
Residential Real Estate Lines [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 75,510 77,367
Financing Receivable, Allowance for Credit Loss, Current 71,872 73,568
Investment securities, nonaccrual 183 221
Nonaccrual with no allowance 183 221
Residential Real Estate Lines [Member] | 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 127 163
Residential Real Estate Lines [Member] | 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 0 20
Residential Real Estate Lines [Member] | Greater than 90 Days [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 0 0
Residential Real Estate Lines [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 127 183
Residential Real Estate Lines [Member] | Total Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 72,182 73,972
Consumer Indirect [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 894,596 948,831
Financing Receivable, Allowance for Credit Loss, Current 850,642 892,577
Investment securities, nonaccrual 2,897 3,814
Nonaccrual with no allowance 2,897 3,814
Consumer Indirect [Member] | 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 9,817 16,128
Consumer Indirect [Member] | 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 1,710 3,204
Consumer Indirect [Member] | Greater than 90 Days [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 0 0
Consumer Indirect [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 11,527 19,332
Consumer Indirect [Member] | Total Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 865,066 915,723
Other Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 43,870 45,100
Financing Receivable, Allowance for Credit Loss, Current 43,755 44,984
Investment securities, nonaccrual 0 13
Nonaccrual with no allowance 0 13
Other Consumer [Member] | 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 132 122
Other Consumer [Member] | 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 16 27
Other Consumer [Member] | Greater than 90 Days [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 36 21
Other Consumer [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 184 170
Other Consumer [Member] | Total Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans $ 43,939 $ 45,167