Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue from Contracts with Customers
Net interest income	$ 162,736	$ 132,593	$ 441,755	$ 393,232
Not in scope of Topic 606	3,116	9,728	4,728	24,937
Total noninterest income	45,857	50,104	131,374	143,343
Total revenue	208,593	182,697	573,129	536,575
Retail Banking
Revenue from Contracts with Customers
Net interest income	117,060	97,547	318,476	289,107
Not in scope of Topic 606	2,085	1,640	4,337	6,862
Total noninterest income	24,480	22,698	70,280	68,768
Total revenue	141,540	120,245	388,756	357,875
Commercial Banking
Revenue from Contracts with Customers
Net interest income	39,586	41,218	111,500	119,718
Not in scope of Topic 606	1,637	1,454	5,023	5,058
Total noninterest income	19,848	18,317	58,918	53,886
Total revenue	59,434	59,535	170,418	173,604
Treasury and Other
Revenue from Contracts with Customers
Net interest income	6,090	(6,172)	11,779	(15,593)
Not in scope of Topic 606	(606)	6,634	(4,632)	13,017
Total noninterest income	1,529	9,089	2,176	20,689
Total revenue	7,619	2,917	13,955	5,096
Service charges on deposit accounts.
Revenue from Contracts with Customers
Revenue by type of service	7,089	6,989	21,433	20,339
Service charges on deposit accounts. | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	6,421	6,151	19,155	18,025
Service charges on deposit accounts. | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	621	335	1,380	899
Service charges on deposit accounts. | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	47	503	898	1,415
Credit and debit card fees
Revenue from Contracts with Customers
Revenue by type of service	17,143	15,407	47,833	45,492
Credit and debit card fees | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	15,831	14,105	44,099	41,322
Credit and debit card fees | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	1,312	1,302	3,734	4,170
Other service charges and fees.
Revenue from Contracts with Customers
Revenue by type of service	7,062	7,671	21,985	22,017
Other service charges and fees. | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	6,081	6,218	18,950	17,765
Other service charges and fees. | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	509	1,036	1,708	3,101
Other service charges and fees. | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	472	417	1,327	1,151
Trust and investment services income
Revenue from Contracts with Customers
Revenue by type of service	9,800	8,625	27,442	25,824
Trust and investment services income | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	9,800	8,625	27,442	25,824
Other.
Revenue from Contracts with Customers
Revenue by type of service	1,647	1,684	7,953	4,734
Other. | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	93	64	396	292
Other. | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	1,250	1,387	6,708	3,506
Other. | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	$ 304	$ 233	$ 849	$ 936