Loans (Recorded Investment by Loan Class in Current and Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 4,752,965	$ 4,657,866
Financing Receivable, Allowance for Credit Loss, Current	4,653,312	4,561,448
Investment securities, nonaccrual	38,337	35,085
Nonaccrual with no allowance	37,226	31,574
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	18,294	22,687
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	10,567	5,120
Greater than 90 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	670	670
Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	29,531	28,477
Total Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	4,721,180	4,625,010
Commercial Business [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	768,549	738,307
Financing Receivable, Allowance for Credit Loss, Current	755,003	732,412
Investment securities, nonaccrual	7,007	4,039
Nonaccrual with no allowance	6,431	528
Commercial Business [Member] \| 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	395	294
Commercial Business [Member] \| 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	4,449	163
Commercial Business [Member] \| Greater than 90 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	670	670
Commercial Business [Member] \| Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	5,514	1,127
Commercial Business [Member] \| Total Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	767,524	737,578
Commercial Mortgage [Member] \| Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	558,036	488,558
Financing Receivable, Allowance for Credit Loss, Current	536,994	468,251
Investment securities, nonaccrual	20,520	20,321
Nonaccrual with no allowance	20,520	20,321
Commercial Mortgage [Member] \| Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	565,027	588,732
Financing Receivable, Allowance for Credit Loss, Current	562,804	585,619
Investment securities, nonaccrual	540	540
Nonaccrual with no allowance	540	540
Commercial Mortgage [Member] \| Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	970,966	942,219
Financing Receivable, Allowance for Credit Loss, Current	971,484	943,514
Investment securities, nonaccrual	0	0
Nonaccrual with no allowance	0	0
Commercial Mortgage [Member] \| Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	347,806	322,776
Financing Receivable, Allowance for Credit Loss, Current	346,871	321,687
Investment securities, nonaccrual	981	1,095
Nonaccrual with no allowance	446	1,095
Commercial Mortgage [Member] \| 30 to 59 Days Past Due [Member] \| Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	0	0
Commercial Mortgage [Member] \| 30 to 59 Days Past Due [Member] \| Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	2,278	3,278
Commercial Mortgage [Member] \| 30 to 59 Days Past Due [Member] \| Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	874	0
Commercial Mortgage [Member] \| 30 to 59 Days Past Due [Member] \| Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	0	0
Commercial Mortgage [Member] \| 60 to 89 Days Past Due [Member] \| Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	2,549	2,463
Commercial Mortgage [Member] \| 60 to 89 Days Past Due [Member] \| Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	0	0
Commercial Mortgage [Member] \| 60 to 89 Days Past Due [Member] \| Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	0	0
Commercial Mortgage [Member] \| 60 to 89 Days Past Due [Member] \| Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	0	0
Commercial Mortgage [Member] \| Greater than 90 Days [Member] \| Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	0	0
Commercial Mortgage [Member] \| Greater than 90 Days [Member] \| Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	0	0
Commercial Mortgage [Member] \| Greater than 90 Days [Member] \| Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	0	0
Commercial Mortgage [Member] \| Greater than 90 Days [Member] \| Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	0	0
Commercial Mortgage [Member] \| Total Past Due [Member] \| Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	2,549	2,463
Commercial Mortgage [Member] \| Total Past Due [Member] \| Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	2,278	3,278
Commercial Mortgage [Member] \| Total Past Due [Member] \| Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	874	0
Commercial Mortgage [Member] \| Total Past Due [Member] \| Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	0	0
Commercial Mortgage [Member] \| Total Loans [Member] \| Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	560,063	491,035
Commercial Mortgage [Member] \| Total Loans [Member] \| Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	565,622	589,437
Commercial Mortgage [Member] \| Total Loans [Member] \| Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	972,358	943,514
Commercial Mortgage [Member] \| Total Loans [Member] \| Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	347,852	322,782
Residential Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	662,582	657,001
Financing Receivable, Allowance for Credit Loss, Current	643,755	638,310
Investment securities, nonaccrual	6,974	6,443
Nonaccrual with no allowance	6,974	6,443
Residential Real Estate Loans [Member] \| 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	3,563	3,274
Residential Real Estate Loans [Member] \| 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	47	161
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	3,610	3,435
Residential Real Estate Loans [Member] \| Total Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	654,339	648,188
Residential Real Estate Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	76,099	75,121
Financing Receivable, Allowance for Credit Loss, Current	72,196	71,133
Investment securities, nonaccrual	412	374
Nonaccrual with no allowance	412	374
Residential Real Estate Lines [Member] \| 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	141	421
Residential Real Estate Lines [Member] \| 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	99	0
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	240	421
Residential Real Estate Lines [Member] \| Total Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	72,848	71,928
Consumer Indirect [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	771,126	807,310
Financing Receivable, Allowance for Credit Loss, Current	732,682	764,388
Investment securities, nonaccrual	1,772	2,155
Nonaccrual with no allowance	1,772	2,155
Consumer Indirect [Member] \| 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	10,684	14,124
Consumer Indirect [Member] \| 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	2,747	2,135
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	13,431	16,259
Consumer Indirect [Member] \| Total Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	747,885	782,802
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	32,774	37,842
Financing Receivable, Allowance for Credit Loss, Current	31,523	36,134
Investment securities, nonaccrual	131	118
Nonaccrual with no allowance	131	118
Other Consumer [Member] \| 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	359	1,296
Other Consumer [Member] \| 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	676	198
Other Consumer [Member] \| Greater than 90 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	0	0
Other Consumer [Member] \| Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,035	1,494
Other Consumer [Member] \| Total Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 32,689	$ 37,746

Amount of allowance for credit loss on financing receivable, classified as current.

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