Noninterest Income - Lending Related Fees (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lending related fees	$ 11,164	$ 11,213	$ 24,289	$ 25,150
Unused commitment fees
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lending related fees	8,324	7,051	16,730	16,721
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lending related fees	$ 2,840	$ 4,162	$ 7,559	$ 8,429