Allowance for Credit Losses on Loans (Allowance for Loan Losses Rollforward Analysis) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance			$ 41,960
Charge-offs			(14,648)	$ (182)	$ (2,413)
Provision for credit losses	$ 6,800	$ 200	8,600	1,400
Allowance, Ending Balance	36,576		36,576		41,960
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	19,604	25,766	26,485	24,144	24,144
Charge-offs	(2,991)	0	(5,715)	0	(1,961)
Recoveries	0	0	200	0
Provision for credit losses	2,230	(8)	(2,127)	1,614
Allowance, Ending Balance	18,843	25,758	18,843	25,758	26,485
Commercial & industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	13,158	7,097	7,277	8,088	8,088
Charge-offs	(8,357)	(4)	(8,681)	(24)	(208)
Recoveries	2	2	16	19
Provision for credit losses	4,911	308	11,102	(680)
Allowance, Ending Balance	9,714	7,403	9,714	7,403	7,277
Total commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	32,762	32,863	33,762	32,232	32,232
Charge-offs	(11,348)	(4)	(14,396)	(24)
Recoveries	2	2	216	19
Provision for credit losses	7,141	300	8,975	934
Allowance, Ending Balance	28,557	33,161	28,557	33,161	33,762
Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	6,919	8,102	6,832	7,403	7,403
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0
Provision for credit losses	(296)	(39)	(209)	660
Allowance, Ending Balance	6,623	8,063	6,623	8,063	6,832
Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	1,107	1,080	1,031	1,048	1,048
Charge-offs	0	0	0	0	0
Recoveries	15	1	17	8
Provision for credit losses	14	5	88	30
Allowance, Ending Balance	1,136	1,086	1,136	1,086	1,031
Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	271	333	335	374	374
Charge-offs	(111)	(55)	(252)	(158)	(244)
Recoveries	9	8	31	28
Provision for credit losses	91	34	146	76
Allowance, Ending Balance	260	320	260	320	335
Total consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	1,378	1,413	1,366	1,422	1,422
Charge-offs	(111)	(55)	(252)	(158)
Recoveries	24	9	48	36
Provision for credit losses	105	39	234	106
Allowance, Ending Balance	1,396	1,406	1,396	1,406	1,366
Financing Receivable
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance, Beginning Balance	41,059	42,378	41,960	41,057	41,057
Charge-offs	(11,459)	(59)	(14,648)	(182)
Recoveries	26	11	264	55
Provision for credit losses	6,950	300	9,000	1,700
Allowance, Ending Balance	$ 36,576	$ 42,630	$ 36,576	$ 42,630	$ 41,960