Allowance for Credit Losses on Loans (Allowance for Loan Losses Rollforward Analysis) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	$ 36,317	$ 41,879	$ 39,088	$ 44,106
Charge-offs	(63)	(249)	(122)	(630)
Recoveries	9	81	226	186
Provision	600	0	(2,329)	(1,951)
Allowance, Ending Balance	36,863	41,711	36,863	41,711
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	17,197	21,450	18,933	22,065
Charge-offs	0	0	0	0
Recoveries	0	0	145	0
Provision	414	(613)	(1,467)	(1,228)
Allowance, Ending Balance	17,611	20,837	17,611	20,837
Commercial & Industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	10,332	11,717	10,832	12,228
Charge-offs	(10)	2	(19)	(304)
Recoveries	1	0	22	3
Provision	24	(392)	(488)	(600)
Allowance, Ending Balance	10,347	11,327	10,347	11,327
Total Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	27,529	33,167	29,765	34,293
Charge-offs	(10)	2	(19)	(304)
Recoveries	1	0	167	3
Provision	438	(1,005)	(1,955)	(1,828)
Allowance, Ending Balance	27,958	32,164	27,958	32,164
Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	7,308	6,877	7,860	8,042
Charge-offs	0	(57)	0	(107)
Recoveries	0	5	21	85
Provision	139	1,131	(434)	(64)
Allowance, Ending Balance	7,447	7,956	7,447	7,956
Home Equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	1,040	1,340	1,069	1,300
Charge-offs	0	(183)	0	(183)
Recoveries	0	73	4	79
Provision	31	(112)	(2)	(78)
Allowance, Ending Balance	1,071	1,118	1,071	1,118
Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	440	495	394	471
Charge-offs	(53)	(11)	(103)	(36)
Recoveries	8	3	34	19
Provision	(8)	(14)	62	19
Allowance, Ending Balance	387	473	387	473
Total Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	1,480	1,835	1,463	1,771
Charge-offs	(53)	(194)	(103)	(219)
Recoveries	8	76	38	98
Provision	23	(126)	60	(59)
Allowance, Ending Balance	$ 1,458	$ 1,591	$ 1,458	$ 1,591