Commitments and Contingencies - Mortgage Repurchase Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Mortgage repurchase liability:
Balance, beginning of period	$ 9,699	$ 7,823
Net provision (recovery)	(1,234)	2,527	$ 7,823
Loss on loan repurchases	(5,511)	(651)
Balance, end of the period	2,954	9,699	7,823
Advantage Loan Program
Mortgage repurchase liability:
Balance, beginning of period	$ 2,527	7,823
Balance, end of the period		$ 2,527	$ 7,823