Fair Value Measurements - Fair Value Measurement Inputs and Valuation Techniques (Details)	12 Months Ended
	Dec. 31, 2021
Scenario Shock, Plus 30%
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assumptions used to estimate fair value, prepayment speed	(16.00%)
Scenario Shock, Minus 30%
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assumptions used to estimate fair value, prepayment speed	15.00%
Scenario Shock, Minus 200 Basis Points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assumptions used to estimate fair value, discount rate	7.00%
Scenario Shock, Plus 200 Basis Points
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assumptions used to estimate fair value, discount rate	(7.00%)