Allowance for Credit Losses on Loans (Allowance for Loan Losses Rollforward Analysis) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	$ 39,236	$ 42,137	$ 39,088	$ 44,106
Charge-offs	(23)	(317)	(59)	(381)
Recoveries	33	59	217	105
Provision	(2,929)	0	(2,929)	(1,951)
Allowance, Ending Balance	36,317	41,879	36,317	41,879
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	18,460	21,297	18,933	22,065
Charge-offs	0	0	0	0
Recoveries	0	0	145	0
Provision	(1,263)	153	(1,881)	(615)
Allowance, Ending Balance	17,197	21,450	17,197	21,450
Commercial & Industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	11,222	12,389	10,832	12,228
Charge-offs	(4)	(303)	(9)	(306)
Recoveries	15	1	21	3
Provision	(901)	(370)	(512)	(208)
Allowance, Ending Balance	10,332	11,717	10,332	11,717
Total Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	29,682	33,686	29,765	34,293
Charge-offs	(4)	(303)	(9)	(306)
Recoveries	15	1	166	3
Provision	(2,164)	(217)	(2,393)	(823)
Allowance, Ending Balance	27,529	33,167	27,529	33,167
Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	8,066	6,469	7,860	8,042
Charge-offs	0	0	0	(50)
Recoveries	0	47	21	80
Provision	(758)	361	(573)	(1,195)
Allowance, Ending Balance	7,308	6,877	7,308	6,877
Home Equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	1,098	1,431	1,069	1,300
Charge-offs	0	0	0	0
Recoveries	2	4	4	6
Provision	(60)	(95)	(33)	34
Allowance, Ending Balance	1,040	1,340	1,040	1,340
Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	390	551	394	471
Charge-offs	(19)	(14)	(50)	(25)
Recoveries	16	7	26	16
Provision	53	(49)	70	33
Allowance, Ending Balance	440	495	440	495
Total Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	1,488	1,982	1,463	1,771
Charge-offs	(19)	(14)	(50)	(25)
Recoveries	18	11	30	22
Provision	(7)	(144)	37	67
Allowance, Ending Balance	$ 1,480	$ 1,835	$ 1,480	$ 1,835