Noninterest Income - Credit Card Fees (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Card interchange fees, net	$ 15,314	$ 22,855	$ 37,089	$ 44,248
Revenue from contracts with customers	285,382	221,371	507,822	438,628
Revenue not from contract with customer	83,466	112,379	162,960	175,498
Total credit card fees	21,288	28,790	49,592	56,273
Merchant service fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,030	4,286	10,057	8,821
Card service fees
Disaggregation of Revenue [Line Items]
Revenue not from contract with customer	$ 944	$ 1,649	$ 2,446	$ 3,204