Fair Value Measurements - Valuation Techniques and Unobservable Inputs Related to Level 3 Assets (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	$ 50,898	$ 125,477
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	$ 34,329	$ 125,477
Level 3 | Valuation, Market Approach | Measurement Input Selling Cost
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Individually evaluated loans requiring specific allowance, net	0.080	0.080
Real estate owned, net	0.080	0.080
Level 3 | Discounted Cash Flow | Discount rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment, at fair value	0.072	0.058
Loans held for sale		0.058
Level 3 | Minimum | Discounted Cash Flow | Discount rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mortgage servicing rights, at fair value	0.080	0.080
Level 3 | Minimum | Discounted Cash Flow | Collateral Value (% of UPB)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment, at fair value	0.963	0.950
Level 3 | Minimum | Discounted Cash Flow | Timing of Resolution/Payoff
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment,at fair value	1 month	1 month
Loans held for sale		3 months
Level 3 | Minimum | Discounted Cash Flow | Measurement Input, Prepayment Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment, at fair value	0.010	0.192
Mortgage servicing rights, at fair value	0.035	0.024
Level 3 | Minimum | Discounted Cash Flow | Interest Rate Multiples
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mortgage servicing rights, at fair value	0.4
Level 3 | Minimum | Discounted Cash Flow | Default Rate [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment, at fair value	0.001	0.000
Level 3 | Minimum | Discounted Cash Flow | Loss Severity Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment, at fair value	0.000	0.000
Level 3 | Maximum | Discounted Cash Flow | Discount rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mortgage servicing rights, at fair value	0.082	0.120
Level 3 | Maximum | Discounted Cash Flow | Collateral Value (% of UPB)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment, at fair value	1.195	1.200
Level 3 | Maximum | Discounted Cash Flow | Timing of Resolution/Payoff
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment,at fair value	40 months	38 months
Loans held for sale		37 months
Level 3 | Maximum | Discounted Cash Flow | Measurement Input, Prepayment Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment, at fair value	0.300	0.50
Mortgage servicing rights, at fair value	0.105	0.035
Level 3 | Maximum | Discounted Cash Flow | Interest Rate Multiples
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mortgage servicing rights, at fair value	35.6
Level 3 | Maximum | Discounted Cash Flow | Default Rate [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment, at fair value	0.065	0.067
Level 3 | Maximum | Discounted Cash Flow | Loss Severity Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment, at fair value	0.209	0.134
Level 3 | Weighted Average | Valuation, Market Approach | Measurement Input Selling Cost
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Individually evaluated loans requiring specific allowance, net	0.080	0.080
Real estate owned, net	0.080	0.080
Level 3 | Weighted Average | Discounted Cash Flow | Discount rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment, at fair value	0.072	0.058
Loans held for sale		0.058
Mortgage servicing rights, at fair value	0.081	0.080
Level 3 | Weighted Average | Discounted Cash Flow | Collateral Value (% of UPB)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment, at fair value	1.070	1.060
Level 3 | Weighted Average | Discounted Cash Flow | Timing of Resolution/Payoff
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment,at fair value	37 months	34 months 24 days
Loans held for sale		13 months
Level 3 | Weighted Average | Discounted Cash Flow | Measurement Input, Prepayment Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment, at fair value	0.300	0.300
Mortgage servicing rights, at fair value	0.053	0.032
Level 3 | Weighted Average | Discounted Cash Flow | Interest Rate Multiples
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mortgage servicing rights, at fair value	9.9
Level 3 | Weighted Average | Discounted Cash Flow | Default Rate [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment, at fair value	0.006	0.010
Level 3 | Weighted Average | Discounted Cash Flow | Loss Severity Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment, at fair value	0.040	0.030
Level 3 | Individually evaluated loans requiring allowance net
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	$ 10,347	$ 11,987
Level 3 | Real Estate Owned, Net
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	13,188	17,557
Level 3 | Loans Held for Investment
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	926	1,359
Level 3 | Loans Held For Sale
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements		87,422
Level 3 | Mortgage Servicing Rights
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	$ 9,868	$ 7,152