Noninterest Income - Credit Card Fees (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Card interchange fees, net	$ 18,168	$ 24,560	$ 55,257	$ 68,808
Revenue from contracts with customers	247,037	205,905	756,847	644,533
Revenue not from contract with customer	300,546	88,104	461,518	263,602
Total credit card fees	22,756	30,158	72,348	86,431
Merchant service fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,670	3,943	13,727	12,763
Card service fees
Disaggregation of Revenue [Line Items]
Revenue not from contract with customer	$ 918	$ 1,655	$ 3,364	$ 4,860