Commitments and Contingencies - Activity in the Repurchase Reserve (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Commitments and Contingencies [Roll Forward]
Balance at beginning of period	$ 4,802	$ 5,928
Provision for loan repurchases or indemnifications	(389)	440
Losses on loans repurchased or indemnified	(96)	(84)
Balance at end of period	$ 4,317	$ 6,284