Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenue from Contracts with Customers
Net interest income (expense)	$ 163,583	$ 152,851	$ 324,109	$ 307,278
Not in scope of Topic 606	7,325	5,960	14,471	11,920
Total noninterest income	53,958	51,768	104,435	103,139
Total revenue	217,541	204,619	428,544	410,417
Retail Banking
Revenue from Contracts with Customers
Net interest income (expense)	130,245	124,696	260,127	252,753
Not in scope of Topic 606	1,885	2,065	3,756	3,914
Total noninterest income	27,754	26,296	54,405	52,331
Total revenue	157,999	150,992	314,532	305,084
Commercial Banking
Revenue from Contracts with Customers
Net interest income (expense)	39,468	45,019	82,010	90,400
Not in scope of Topic 606	1,406	1,556	3,158	2,553
Total noninterest income	19,039	18,623	36,794	36,581
Total revenue	58,507	63,642	118,804	126,981
Treasury and Other
Revenue from Contracts with Customers
Net interest income (expense)	(6,130)	(16,864)	(18,028)	(35,875)
Not in scope of Topic 606	4,034	2,339	7,557	5,453
Total noninterest income	7,165	6,849	13,236	14,227
Total revenue	1,035	(10,015)	(4,792)	(21,648)
Service charges on deposit accounts
Revenue from Contracts with Customers
Revenue by type of service	7,830	7,793	15,365	15,339
Service charges on deposit accounts | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	6,631	6,778	12,995	13,453
Service charges on deposit accounts | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	1,090	894	2,153	1,718
Service charges on deposit accounts | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	109	121	217	168
Credit and debit card fees
Revenue from Contracts with Customers
Revenue by type of service	15,340	15,290	29,243	30,887
Credit and debit card fees | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	14,375	14,272	27,304	28,863
Credit and debit card fees | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	965	1,018	1,939	2,024
Other service charges and fees
Revenue from Contracts with Customers
Revenue by type of service	11,064	8,873	20,997	16,778
Other service charges and fees | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	9,815	7,772	18,659	14,709
Other service charges and fees | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	652	510	1,226	908
Other service charges and fees | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	597	591	1,112	1,161
Trust and investment services income
Revenue from Contracts with Customers
Revenue by type of service	9,154	9,426	18,524	19,780
Trust and investment services income | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	9,154	9,426	18,524	19,780
Other
Revenue from Contracts with Customers
Revenue by type of service	3,245	4,426	5,835	8,435
Other | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	269	255	471	475
Other | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	1,516	1,391	2,953	2,539
Other | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	$ 1,460	$ 2,780	$ 2,411	$ 5,421