Loans and Allowance for Credit Losses - Allowance for Credit Loss Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 93,271	$ 99,010	$ 93,178	$ 101,494	$ 101,494
Provision for credit losses on loans	1,044	728	2,824	(1,783)
Charge-offs	(1,236)	(1,656)	(3,171)	(2,540)	(18,075)
Recoveries	241	498	489	1,409
Net (Charge-offs) Recoveries	(995)	(1,158)	(2,682)	(1,131)
Balance at End of Period	93,320	98,580	93,320	98,580	93,178
Commercial loans | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	28,385	29,895	29,357	30,254	30,254
Provision for credit losses on loans	190	438	(784)	(54)
Charge-offs	0	0	0	0	(7,339)
Recoveries	2	2	4	135
Net (Charge-offs) Recoveries	2	2	4	135
Balance at End of Period	28,577	30,335	28,577	30,335	29,357
Commercial loans | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	30,693	33,414	29,142	37,084	37,084
Provision for credit losses on loans	722	(1,157)	2,406	(4,800)
Charge-offs	(555)	(256)	(753)	(428)	(6,723)
Recoveries	34	79	99	224
Net (Charge-offs) Recoveries	(521)	(177)	(654)	(204)
Balance at End of Period	30,894	32,080	30,894	32,080	29,142
Commercial loans | Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	4,653	5,880	4,400	4,893	4,893
Provision for credit losses on loans	715	677	968	1,694
Charge-offs	(69)	(89)	(69)	(119)	(118)
Recoveries	0	0	0	0
Net (Charge-offs) Recoveries	(69)	(89)	(69)	(119)
Balance at End of Period	5,299	6,468	5,299	6,468	4,400
Commercial loans | Business banking
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	10,919	11,213	11,335	10,681	10,681
Provision for credit losses on loans	(120)	387	0	1,037
Charge-offs	(263)	(179)	(817)	(322)	(1,114)
Recoveries	91	40	109	65
Net (Charge-offs) Recoveries	(172)	(139)	(708)	(257)
Balance at End of Period	10,627	11,461	10,627	11,461	11,335
Consumer loans | Consumer real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	16,181	15,907	16,297	15,776	15,776
Provision for credit losses on loans	(84)	(206)	63	(47)
Charge-offs	(201)	(390)	(502)	(552)	(828)
Recoveries	69	216	107	350
Net (Charge-offs) Recoveries	(132)	(174)	(395)	(202)
Balance at End of Period	15,965	15,527	15,965	15,527	16,297
Consumer loans | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	2,440	2,701	2,647	2,806	2,806
Provision for credit losses on loans	(379)	589	171	387
Charge-offs	(148)	(742)	(1,030)	(1,119)	(1,953)
Recoveries	45	161	170	635
Net (Charge-offs) Recoveries	(103)	(581)	(860)	(484)
Balance at End of Period	$ 1,958	$ 2,709	$ 1,958	$ 2,709	$ 2,647