Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue from Contracts with Customers
Net interest income (expense)	$ 154,427	$ 167,247
Not in scope of Topic 606	5,959	6,159
Total noninterest income	51,371	49,023
Total revenue	205,798	216,270
Retail Banking
Revenue from Contracts with Customers
Net interest income (expense)	128,057	108,920
Not in scope of Topic 606	1,848	1,702
Total noninterest income	26,035	24,267
Total revenue	154,092	133,187
Commercial Banking
Revenue from Contracts with Customers
Net interest income (expense)	45,381	40,939
Not in scope of Topic 606	996	1,111
Total noninterest income	17,958	17,888
Total revenue	63,339	58,827
Treasury and Other
Revenue from Contracts with Customers
Net interest income (expense)	(19,011)	17,388
Not in scope of Topic 606	3,115	3,346
Total noninterest income	7,378	6,868
Total revenue	(11,633)	24,256
Service charges on deposit accounts.
Revenue from Contracts with Customers
Revenue by type of service	7,546	7,231
Service charges on deposit accounts. | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	6,675	6,541
Service charges on deposit accounts. | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	824	626
Service charges on deposit accounts. | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	47	64
Credit and debit card fees
Revenue from Contracts with Customers
Revenue by type of service	15,598	15,710
Credit and debit card fees | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	14,592	14,414
Credit and debit card fees | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	1,006	1,296
Other service charges and fees.
Revenue from Contracts with Customers
Revenue by type of service	7,906	7,104
Other service charges and fees. | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	6,938	6,171
Other service charges and fees. | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	398	420
Other service charges and fees. | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	570	513
Trust and investment services income
Revenue from Contracts with Customers
Revenue by type of service	10,354	9,614
Trust and investment services income | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	10,354	9,614
Other.
Revenue from Contracts with Customers
Revenue by type of service	4,008	3,205
Other. | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	220	239
Other. | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	1,148	1,317
Other. | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	$ 2,640	$ 1,649