Business Segment Reporting - Schedule of Segment Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Net interest income	$ 208,617	$ 189,273
Provision for credit losses	3,146	2,920
Net interest income after provision for credit losses	205,471	186,353
Noninterest income	65,088	58,788
Noninterest expense	126,616	122,261
Income before income taxes	143,943	122,880
Income taxes	32,855	28,082
Net income	111,088	94,798
Assets under advice	16,012,029	13,543,819
Corporate And Eliminations
Segment Reporting Information [Line Items]
Net interest income	14,318	7,821
Provision for credit losses	21	7
Net interest income after provision for credit losses	14,297	7,814
Noninterest income	989	1,498
Noninterest expense	10,554	10,455
Income before income taxes	4,732	(1,143)
Income taxes	157	(964)
Net income	4,575	(179)
Assets under advice	0	0
Consumer | Operating Segments
Segment Reporting Information [Line Items]
Net interest income	81,271	75,181
Provision for credit losses	2,193	1,885
Net interest income after provision for credit losses	79,078	73,296
Noninterest income	32,034	28,494
Noninterest expense	62,994	59,907
Income before income taxes	48,118	41,883
Income taxes	11,530	10,026
Net income	36,588	31,857
Assets under advice	0	0
Commercial | Operating Segments
Segment Reporting Information [Line Items]
Net interest income	113,043	106,290
Provision for credit losses	932	1,031
Net interest income after provision for credit losses	112,111	105,259
Noninterest income	10,732	10,377
Noninterest expense	39,623	39,370
Income before income taxes	83,220	76,266
Income taxes	19,274	17,613
Net income	63,946	58,653
Assets under advice	0	0
Wealth Management | Operating Segments
Segment Reporting Information [Line Items]
Net interest income	(15)	(19)
Provision for credit losses	0	(3)
Net interest income after provision for credit losses	(15)	(16)
Noninterest income	21,333	18,419
Noninterest expense	13,445	12,529
Income before income taxes	7,873	5,874
Income taxes	1,894	1,407
Net income	5,979	4,467
Assets under advice	$ 16,012,029	$ 13,543,819