Noninterest Income - Lending Related Fees (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lending related fees	$ 15,657	$ 13,125
Unused commitment fees
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lending related fees	12,256	8,406
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lending related fees	$ 3,401	$ 4,719