Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue from Contracts with Customers
Net interest income (loss)	$ 157,148	$ 162,736	$ 484,334	$ 441,755
Not in scope of Topic 606	3,637	3,116	15,492	4,728
Total noninterest income	46,097	45,857	142,468	131,374
Total revenue	203,245	208,593	626,802	573,129
Retail Banking
Revenue from Contracts with Customers
Net interest income (loss)	119,070	117,060	332,227	318,476
Not in scope of Topic 606	1,821	2,085	5,277	4,337
Total noninterest income	24,834	24,480	72,898	70,280
Total revenue	143,904	141,540	405,125	388,756
Commercial Banking
Revenue from Contracts with Customers
Net interest income (loss)	45,913	39,586	128,348	111,500
Not in scope of Topic 606	1,130	1,637	4,069	5,023
Total noninterest income	18,858	19,848	55,832	58,918
Total revenue	64,771	59,434	184,180	170,418
Treasury and Other
Revenue from Contracts with Customers
Net interest income (loss)	(7,835)	6,090	23,759	11,779
Not in scope of Topic 606	686	(606)	6,146	(4,632)
Total noninterest income	2,405	1,529	13,738	2,176
Total revenue	(5,430)	7,619	37,497	13,955
Service charges on deposit accounts.
Revenue from Contracts with Customers
Revenue by type of service	7,524	7,089	22,001	21,433
Service charges on deposit accounts. | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	6,724	6,421	19,723	19,155
Service charges on deposit accounts. | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	714	621	2,002	1,380
Service charges on deposit accounts. | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	86	47	276	898
Credit and debit card fees
Revenue from Contracts with Customers
Revenue by type of service	15,142	17,143	45,731	47,833
Credit and debit card fees | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	13,990	15,831	42,044	44,099
Credit and debit card fees | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	1,152	1,312	3,687	3,734
Other service charges and fees.
Revenue from Contracts with Customers
Revenue by type of service	7,415	7,062	21,541	21,985
Other service charges and fees. | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	6,461	6,081	18,681	18,950
Other service charges and fees. | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	425	509	1,268	1,708
Other service charges and fees. | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	529	472	1,592	1,327
Trust and investment services income
Revenue from Contracts with Customers
Revenue by type of service	9,742	9,800	28,804	27,442
Trust and investment services income | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	9,742	9,800	28,804	27,442
Other.
Revenue from Contracts with Customers
Revenue by type of service	2,637	1,647	8,899	7,953
Other. | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	86	93	413	396
Other. | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	2,599	1,250	6,449	6,708
Other. | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	$ (48)	$ 304	$ 2,037	$ 849