Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue out of scope of ASC 606	$ 79,761	$ 78,518
Total noninterest income	132,060	136,963
Fees and service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Revenue out of scope of ASC 606	328	214
Total noninterest income	25,895	34,597
Wealth management revenue
Disaggregation of Revenue [Line Items]
Revenue out of scope of ASC 606	5,025	5,041
Total noninterest income	6,944	6,151
Card and ATM revenue
Disaggregation of Revenue [Line Items]
Revenue out of scope of ASC 606	3,418	2,501
Total noninterest income	24,661	21,685
Other noninterest income
Disaggregation of Revenue [Line Items]
Revenue out of scope of ASC 606	70,990	70,762
Total noninterest income	74,560	74,530
Consumer Banking
Disaggregation of Revenue [Line Items]
Revenues within the scope of 606	47,448	53,124
Total noninterest income	81,390	81,414
Consumer Banking | Fees and service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Revenues within the scope of 606	22,560	31,828
Consumer Banking | Wealth management revenue
Disaggregation of Revenue [Line Items]
Revenues within the scope of 606	1,919	1,110
Consumer Banking | Card and ATM revenue
Disaggregation of Revenue [Line Items]
Revenues within the scope of 606	21,214	19,182
Consumer Banking | Other noninterest income
Disaggregation of Revenue [Line Items]
Revenues within the scope of 606	1,755	1,004
Commercial Banking
Disaggregation of Revenue [Line Items]
Revenues within the scope of 606	4,821	4,962
Total noninterest income	49,016	55,773
Commercial Banking | Fees and service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Revenues within the scope of 606	3,007	2,555
Commercial Banking | Wealth management revenue
Disaggregation of Revenue [Line Items]
Revenues within the scope of 606	0	0
Commercial Banking | Card and ATM revenue
Disaggregation of Revenue [Line Items]
Revenues within the scope of 606	29	2
Commercial Banking | Other noninterest income
Disaggregation of Revenue [Line Items]
Revenues within the scope of 606	1,785	2,405
Enterprise Services
Disaggregation of Revenue [Line Items]
Revenues within the scope of 606	30	359
Total noninterest income	1,654	(224)
Enterprise Services | Fees and service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Revenues within the scope of 606	0	0
Enterprise Services | Wealth management revenue
Disaggregation of Revenue [Line Items]
Revenues within the scope of 606	0	0
Enterprise Services | Card and ATM revenue
Disaggregation of Revenue [Line Items]
Revenues within the scope of 606	0	0
Enterprise Services | Other noninterest income
Disaggregation of Revenue [Line Items]
Revenues within the scope of 606	$ 30	$ 359