Subsequent Events Subsequent Events (Details) - USD ($)	Jan. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Financing Receivable, CARES Act		$ 296,300,000
Financing Receivable, CARES Act Applications		3,150
Commercial Portfolio Segment [Member]
Subsequent Event [Line Items]
Loans held for investment		$ 2,153,900,000	$ 1,673,700,000
Class A Common Stock | Subsequent Event
Subsequent Event [Line Items]
Dividends (in dollars per share)	$ 0.41