Mortgage Servicing Assets - Schedule of Range and Weighted-Average of Significant Unobservable Inputs (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Agency commercial mortgage-backed securities | Minimum
Servicing Assets at Fair Value [Line Items]
Expected defaults	1.00%	1.01%
Discount rate	7.92%	7.48%
Escrow earn rate	1.34%	0.92%
Loan assumption rate	0.00%	0.00%
Agency commercial mortgage-backed securities | Maximum
Servicing Assets at Fair Value [Line Items]
Expected defaults	2.00%	2.00%
Discount rate	10.46%	10.62%
Escrow earn rate	1.74%	1.14%
Loan assumption rate	1.69%	1.77%
Agency commercial mortgage-backed securities | Weighted Average
Servicing Assets at Fair Value [Line Items]
Expected defaults	1.13%	1.18%
Discount rate	9.44%	9.22%
Escrow earn rate	1.34%	1.04%
Loan assumption rate	1.37%	1.43%
Agency residential mortgage-backed securities | Minimum
Servicing Assets at Fair Value [Line Items]
Discount rate	7.50%	7.51%
Prepayment speed	9.65%	12.39%
Servicing cost	$ 62.00	$ 62.00
Agency residential mortgage-backed securities | Maximum
Servicing Assets at Fair Value [Line Items]
Discount rate	11.50%	8.63%
Prepayment speed	49.17%	54.27%
Servicing cost	$ 8,075	$ 5,125
Agency residential mortgage-backed securities | Weighted Average
Servicing Assets at Fair Value [Line Items]
Discount rate	7.53%	7.55%
Prepayment speed	10.97%	17.09%
Servicing cost	$ 66.94	$ 75.37