Goodwill and Identifiable Intangible Assets - Goodwill by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 384,237	$ 384,237
Adjustment	0	0
Balance, end of period	384,237	384,237
General Banking [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	334,603	334,603
Adjustment	0	0
Balance, end of period	334,603	334,603
Insurance [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	49,634	49,634
Adjustment	0	0
Balance, end of period	$ 49,634	$ 49,634