Derivative Financial Instruments - Effects of Derivative Instruments on Statements of Operations (Details) - Derivatives not Designated as Hedging Instruments [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Mortgage Banking, Net [Member]
Derivatives, Fair Value [Line Items]
Amount of gain (loss) recognized in mortgage banking, net	$ (1,614)	$ 12,395	$ (10,812)	$ 45,881
Bank Card and Other Fees [Member]
Derivatives, Fair Value [Line Items]
Amount of gain (loss) recognized in bank card and other fees	$ (667)	$ (76)	$ 935	$ (1,736)