Noninterest Income - Credit Card Fees (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Card interchange fees, net	$ 75,562	$ 93,553	$ 74,381
Revenue from contracts with customers	1,056,842	880,951	511,656
Revenue not from contracts with customer	783,306	340,528	233,328
Total credit card fees	97,737	118,719	94,072
Merchant service fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	17,732	18,355	14,420
Card service fees
Disaggregation of Revenue [Line Items]
Revenue not from contracts with customer	$ 4,443	$ 6,811	$ 5,271