Allowance for Credit Losses on Loans (Allowance for Loan Losses Rollforward Analysis) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	$ 38,780	$ 39,236	$ 38,027	$ 39,088
Charge-offs	(52)	(23)	(113)	(59)
Recoveries	15	33	29	217
Provision	600	(2,929)	1,400	(2,929)
Allowance, Ending Balance	39,343	36,317	39,343	36,317
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	21,374	18,460	18,435	18,933
Charge-offs	0	0	0	0
Recoveries	0	0	0	145
Provision	652	(1,263)	3,591	(1,881)
Allowance, Ending Balance	22,026	17,197	22,026	17,197
Commercial & Industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	9,833	11,222	10,356	10,832
Charge-offs	(9)	(4)	(20)	(9)
Recoveries	4	15	9	21
Provision	(400)	(901)	(917)	(512)
Allowance, Ending Balance	9,428	10,332	9,428	10,332
Total Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	31,207	29,682	28,791	29,765
Charge-offs	(9)	(4)	(20)	(9)
Recoveries	4	15	9	166
Provision	252	(2,164)	2,674	(2,393)
Allowance, Ending Balance	31,454	27,529	31,454	27,529
Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	6,239	8,066	7,740	7,860
Charge-offs	0	0	0	0
Recoveries	0	0	0	21
Provision	203	(758)	(1,298)	(573)
Allowance, Ending Balance	6,442	7,308	6,442	7,308
Home Equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	978	1,098	1,115	1,069
Charge-offs	0	0	0	0
Recoveries	2	2	3	4
Provision	59	(60)	(79)	(33)
Allowance, Ending Balance	1,039	1,040	1,039	1,040
Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	356	390	381	394
Charge-offs	(43)	(19)	(93)	(50)
Recoveries	9	16	17	26
Provision	86	53	103	70
Allowance, Ending Balance	408	440	408	440
Total Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	1,334	1,488	1,496	1,463
Charge-offs	(43)	(19)	(93)	(50)
Recoveries	11	18	20	30
Provision	145	(7)	24	37
Allowance, Ending Balance	$ 1,447	$ 1,480	$ 1,447	$ 1,480