Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contracts with Customers
Net interest income	$ 530,559	$ 535,734	$ 573,402
Not in scope of Topic 606	25,149	48,106	25,137
Total noninterest income	184,916	197,380	192,533
Total revenue	715,475	733,114	765,935
Retail Banking
Revenue from Contracts with Customers
Net interest income	385,656	375,145	413,029
Not in scope of Topic 606	8,270	16,264	8,844
Total noninterest income	91,672	98,026	95,413
Total revenue	477,328	473,171	508,442
Commercial Banking
Revenue from Contracts with Customers
Net interest income	162,997	151,622	141,227
Not in scope of Topic 606	6,491	19,945	7,368
Total noninterest income	72,781	78,202	73,635
Total revenue	235,778	229,824	214,862
Treasury and Other
Revenue from Contracts with Customers
Net interest income	(18,094)	8,967	19,146
Not in scope of Topic 606	10,388	11,897	8,925
Total noninterest income	20,463	21,152	23,485
Total revenue	2,369	30,119	42,631
Service charges on deposit accounts.
Revenue from Contracts with Customers
Revenue by type of service	27,510	28,169	33,778
Service charges on deposit accounts. | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	24,413	25,326	30,298
Service charges on deposit accounts. | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	1,225	1,305	1,238
Service charges on deposit accounts. | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	1,872	1,538	2,242
Credit and debit card fees
Revenue from Contracts with Customers
Revenue by type of service	61,143	53,372	64,846
Credit and debit card fees | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	55,728	48,999	58,034
Credit and debit card fees | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	5,415	4,373	6,812
Other service charges and fees.
Revenue from Contracts with Customers
Revenue by type of service	29,058	23,167	24,705
Other service charges and fees. | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	23,917	20,084	20,454
Other service charges and fees. | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	3,547	1,550	2,096
Other service charges and fees. | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	1,594	1,533	2,155
Trust and investment services income
Revenue from Contracts with Customers
Revenue by type of service	34,719	35,652	35,102
Trust and investment services income | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	34,719	35,652	35,102
Other.
Revenue from Contracts with Customers
Revenue by type of service	7,337	8,914	8,965
Other. | Retail Banking
Revenue from Contracts with Customers
Revenue by type of service	353	700	715
Other. | Commercial Banking
Revenue from Contracts with Customers
Revenue by type of service	5,790	6,403	4,899
Other. | Treasury and Other
Revenue from Contracts with Customers
Revenue by type of service	$ 1,194	$ 1,811	$ 3,351