Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue from Contracts with Customers
Net interest income (expense)	$ 156,707	$ 157,148	$ 463,985	$ 484,334
Not in scope of Topic 606	6,072	3,637	17,992	15,492
Total noninterest income	53,288	46,097	156,427	142,468
Total revenue	209,995	203,245	620,412	626,802
Retail Banking
Revenue from Contracts with Customers
Net interest income (expense)	126,335	119,070	379,088	332,227
Not in scope of Topic 606	2,073	1,821	5,987	5,277
Total noninterest income	26,585	24,834	78,916	72,898
Total revenue	152,920	143,904	458,004	405,125
Commercial Banking
Revenue from Contracts with Customers
Net interest income (expense)	47,222	45,913	137,622	128,348
Not in scope of Topic 606	1,742	1,130	4,295	4,069
Total noninterest income	21,666	18,858	58,247	55,832
Total revenue	68,888	64,771	195,869	184,180
Treasury and Other
Revenue from Contracts with Customers
Net interest income (expense)	(16,850)	(7,835)	(52,725)	23,759
Not in scope of Topic 606	2,257	686	7,710	6,146
Total noninterest income	5,037	2,405	19,264	13,738
Total revenue	(11,813)	(5,430)	(33,461)	37,497
Deposit Account [Member]
Revenue from Contracts with Customers
Revenue by type of service	7,783	7,524	23,122	22,001
Deposit Account [Member] | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	6,644	6,724	20,097	19,723
Deposit Account [Member] | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	1,028	714	2,746	2,002
Deposit Account [Member] | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	111	86	279	276
Credit and Debit Card [Member]
Revenue from Contracts with Customers
Revenue by type of service	16,958	15,142	47,846	45,731
Credit and Debit Card [Member] | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	15,968	13,990	44,831	42,044
Credit and Debit Card [Member] | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	990	1,152	3,015	3,687
Financial Service, Other [Member]
Revenue from Contracts with Customers
Revenue by type of service	9,630	7,415	26,407	21,541
Financial Service, Other [Member] | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	8,598	6,461	23,306	18,681
Financial Service, Other [Member] | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	426	425	1,334	1,268
Financial Service, Other [Member] | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	606	529	1,767	1,592
Fiduciary and Trust [Member]
Revenue from Contracts with Customers
Revenue by type of service	9,077	9,742	28,857	28,804
Fiduciary and Trust [Member] | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	9,077	9,742	28,857	28,804
Other.
Revenue from Contracts with Customers
Revenue by type of service	3,768	2,637	12,203	8,899
Other. | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	193	86	669	413
Other. | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	2,502	2,599	5,041	6,449
Other. | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	$ 1,073	$ (48)	$ 6,493	$ 2,037