Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenue from Contracts with Customers
Net interest income (expense)	$ 160,526	$ 154,427
Not in scope of Topic 606	7,144	5,959
Total noninterest income	50,477	51,371
Total revenue	211,003	205,798
Retail Banking
Revenue from Contracts with Customers
Net interest income (expense)	129,882	128,057
Not in scope of Topic 606	1,871	1,848
Total noninterest income	26,651	26,035
Total revenue	156,533	154,092
Commercial Banking
Revenue from Contracts with Customers
Net interest income (expense)	42,542	45,381
Not in scope of Topic 606	1,750	996
Total noninterest income	17,755	17,958
Total revenue	60,297	63,339
Treasury and Other
Revenue from Contracts with Customers
Net interest income (expense)	(11,898)	(19,011)
Not in scope of Topic 606	3,523	3,115
Total noninterest income	6,071	7,378
Total revenue	(5,827)	(11,633)
Service charges on deposit accounts
Revenue from Contracts with Customers
Revenue by type of service	7,535	7,546
Service charges on deposit accounts | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	6,364	6,675
Service charges on deposit accounts | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	1,064	824
Service charges on deposit accounts | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	107	47
Credit and debit card fees
Revenue from Contracts with Customers
Revenue by type of service	13,904	15,598
Credit and debit card fees | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	12,930	14,592
Credit and debit card fees | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	974	1,006
Other service charges and fees
Revenue from Contracts with Customers
Revenue by type of service	9,933	7,906
Other service charges and fees | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	8,844	6,938
Other service charges and fees | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	574	398
Other service charges and fees | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	515	570
Trust and investment services income
Revenue from Contracts with Customers
Revenue by type of service	9,370	10,354
Trust and investment services income | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	9,370	10,354
Other
Revenue from Contracts with Customers
Revenue by type of service	2,591	4,008
Other | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	202	220
Other | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	1,437	1,148
Other | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	$ 952	$ 2,640