Allowance for Credit Losses - Rollforward of the Reserve for Unfunded Commitments (Details) - Reserve for unfunded commitments - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance	$ 36,199	$ 28,958	$ 33,835	$ 30,322
Provision	1,576	1,183	3,940	(181)
Reserve for unfunded commitments, ending balance	37,775	30,141	37,775	30,141
Commercial and Industrial
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance	6,354	7,640	7,811	8,615
Provision	3,577	478	2,120	(497)
Reserve for unfunded commitments, ending balance	9,931	8,118	9,931	8,118
Commercial real estate
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance	1,991	3,750	2,004	2,114
Provision	(129)	(1,397)	(142)	239
Reserve for unfunded commitments, ending balance	1,862	2,353	1,862	2,353
Construction
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance	9,789	6,084	7,470	8,963
Provision	(382)	630	1,937	(2,249)
Reserve for unfunded commitments, ending balance	9,407	6,714	9,407	6,714
Residential Lending: Residential Mortgage
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance	19	32	30	15
Provision	(6)	(4)	(17)	13
Reserve for unfunded commitments, ending balance	13	28	13	28
Home equity line
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance	18,015	11,423	16,483	10,546
Provision	(1,475)	1,473	57	2,350
Reserve for unfunded commitments, ending balance	16,540	12,896	16,540	12,896
Consumer Portfolio Segment [Member]
Reserve for unfunded commitments:
Reserve for unfunded commitments, beginning balance	31	29	37	69
Provision	(9)	3	(15)	(37)
Reserve for unfunded commitments, ending balance	$ 22	$ 32	$ 22	$ 32