Allowance for Credit Losses on Loans (Allowance for Loan Losses Rollforward Analysis) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	$ 41,905	$ 38,780	$ 41,057	$ 38,027	$ 38,027
Charge-offs	(53)	(52)	(123)	(113)	(577)
Recoveries	26	15	44	29
Provision	500	600	1,400	1,400
Allowance, Ending Balance	42,378	39,343	42,378	39,343	41,057
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	24,856	21,374	24,144	18,435	18,435
Charge-offs	0	0	0	0	(373)
Recoveries	0	0	0	0
Provision	910	652	1,622	3,591
Allowance, Ending Balance	25,766	22,026	25,766	22,026	24,144
Commercial & industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	7,620	9,833	8,088	10,356	10,356
Charge-offs	(12)	(9)	(20)	(20)	(37)
Recoveries	8	4	17	9
Provision	(519)	(400)	(988)	(917)
Allowance, Ending Balance	7,097	9,428	7,097	9,428	8,088
Total commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	32,476	31,207	32,232	28,791	28,791
Charge-offs	(12)	(9)	(20)	(20)
Recoveries	8	4	17	9
Provision	391	252	634	2,674
Allowance, Ending Balance	32,863	31,454	32,863	31,454	32,232
Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	8,035	6,239	7,403	7,740	7,740
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0
Provision	67	203	699	(1,298)
Allowance, Ending Balance	8,102	6,442	8,102	6,442	7,403
Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	1,057	978	1,048	1,115	1,115
Charge-offs	0	0	0	0	0
Recoveries	6	2	7	3
Provision	17	59	25	(79)
Allowance, Ending Balance	1,080	1,039	1,080	1,039	1,048
Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	337	356	374	381	381
Charge-offs	(41)	(43)	(103)	(93)	(167)
Recoveries	12	9	20	17
Provision	25	86	42	103
Allowance, Ending Balance	333	408	333	408	374
Total consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	1,394	1,334	1,422	1,496	1,496
Charge-offs	(41)	(43)	(103)	(93)
Recoveries	18	11	27	20
Provision	42	145	67	24
Allowance, Ending Balance	$ 1,413	$ 1,447	$ 1,413	$ 1,447	$ 1,422