Business Segment Reporting - Schedule of Segment Income Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Net interest income	$ 789,665	$ 687,324
Provision for credit losses	9,311	14,587
Net interest income after provision for credit losses	780,354	672,737
Other income	231,694	210,390
Noninterest Expense	505,490	489,407
Income before income taxes	506,558	393,720
Income taxes	115,705	87,910
Net income	390,853	305,810
Total assets	20,751,978	19,242,543
Assets under advice	$ 15,956,069	$ 13,527,632
Effective tax rate (as percent)	22.80%	22.30%
Consumer
Segment Reporting Information [Line Items]
Noninterest Expense	$ 243,012	$ 242,560
Loss on sale of portfolio	13,600
Loans charged off	5,000
Gain on sales, net	$ 6,600
Effective tax rate (as percent)	23.84%
Commercial
Segment Reporting Information [Line Items]
Noninterest Expense	$ 159,151	148,737
Wealth Management
Segment Reporting Information [Line Items]
Noninterest Expense	52,168	46,863
Operating Segments | Consumer
Segment Reporting Information [Line Items]
Net interest income	315,068	276,775
Provision for credit losses	4,402	11,640
Net interest income after provision for credit losses	310,666	265,135
Other income	111,268	124,854
Noninterest Expense	243,012	242,560
Income before income taxes	178,922	147,429
Income taxes	42,886	35,260
Net income	136,036	112,169
Total assets	3,498,285	3,534,547
Assets under advice	0	0
Operating Segments | Commercial
Segment Reporting Information [Line Items]
Net interest income	436,212	403,079
Provision for credit losses	3,754	3,359
Net interest income after provision for credit losses	432,458	399,720
Other income	42,869	43,334
Noninterest Expense	159,151	148,737
Income before income taxes	316,176	294,317
Income taxes	73,155	67,799
Net income	243,021	226,518
Total assets	8,530,725	8,572,871
Assets under advice	0	0
Operating Segments | Wealth Management
Segment Reporting Information [Line Items]
Net interest income	(75)	(250)
Provision for credit losses	(4)	2
Net interest income after provision for credit losses	(71)	(252)
Other income	77,360	69,212
Noninterest Expense	52,168	46,863
Income before income taxes	25,121	22,097
Income taxes	6,049	5,306
Net income	19,072	16,791
Total assets	19,441	24,728
Assets under advice	15,956,069	13,527,632
Corporate And Eliminations
Segment Reporting Information [Line Items]
Net interest income	38,460	7,720
Provision for credit losses	1,159	(414)
Net interest income after provision for credit losses	37,301	8,134
Other income	197	(27,010)
Noninterest Expense	51,159	51,247
Income before income taxes	(13,661)	(70,123)
Income taxes	(6,385)	(20,455)
Net income	(7,276)	(49,668)
Total assets	8,703,527	7,110,397
Assets under advice	$ 0	$ 0