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Securities, at Fair Value - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Allowance for loan loss	$ 37,192,000	$ 35,457,000	$ 37,192,000	$ 44,102,000	$ 36,927,000	$ 39,447,000	$ 54,261,000	$ 63,244,000	$ 86,833,000
Securities, at fair value
Debt Securities, Available-for-sale [Line Items]
Securities, at fair value	148,200,000		148,200,000			153,800,000
Amortized costs	126,700,000		126,700,000			121,400,000
Gross unrealized gains	21,400,000		$ 21,400,000			32,400,000
Weighted average yield		10.30%	12.70%
Weighted average to maturity		1 year 8 months 12 days	10 months 24 days
CRT, Fair Value Option
Debt Securities, Available-for-sale [Line Items]
Debt securities, sold	15,300,000		$ 15,700,000	0
Realized gain	70,000		84,000
Gross unrealized losses	1,200,000		1,200,000			$ 10,000
Non-Agency MBS
Debt Securities, Available-for-sale [Line Items]
Gross unrealized losses	0		0
Allowance for loan loss	$ 0		$ 0	$ 0

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Financial Instruments, Owned, Mortgages, Mortgage-Backed And Asset-Backed Securities, Gross Unrealized Gains

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Financial Instruments, Owned, Mortgages, Mortgage-Backed And Asset-Backed Securities, Weighted Average To Maturity

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Financial Instruments, Owned, Mortgages, Mortgage-backed and Asset-backed Securities, Amortized Costs

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Financial Instruments, Owned, Mortgages, Mortgage-backed and Asset-backed Securities, Weighted Average Yield

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with interest rate reset through auction process, sold at par value.

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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