Goodwill and Other Acquisition-Related Intangible Assets - Schedule of Amortization of Finite-Lived Acquisition-Related Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Intangibles with finite lives
Accumulated amortization	$ (68,990)	$ (66,710)	$ (63,946)
Intangibles with indefinite lives
Gross carrying amount	89,597	89,599	89,599
Total other acquisition-related intangible assets, net	20,607	22,889	25,653
Community banking
Intangibles with indefinite lives
Total other acquisition-related intangible assets, net	13,340	14,881	16,574
Community banking | Trademark
Intangibles with indefinite lives
Carrying amount	5,800	5,800	5,800
Community banking | Core deposit intangibles
Intangibles with finite lives
Gross carrying amount	55,206	55,206	55,206
Accumulated amortization	(47,666)	(46,125)	(44,432)
Net carrying amount	7,540	9,081	10,774
Specialty finance | Customer list intangibles
Intangibles with finite lives
Gross carrying amount	1,961	1,963	1,963
Accumulated amortization	(1,861)	(1,837)	(1,813)
Net carrying amount	100	126	150
Wealth management | Customer list and other intangibles
Intangibles with finite lives
Gross carrying amount	26,630	26,630	26,630
Accumulated amortization	(19,463)	(18,748)	(17,701)
Net carrying amount	$ 7,167	$ 7,882	$ 8,929