Residential Mortgage Loans - Summary (Details) - Residential mortgage loans $ in Thousands	Jun. 30, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Cost	$ 1,374,605	$ 1,063,146
Unpaid principal balance	1,333,995	1,022,461
Net premium on mortgage loans purchased	40,610	40,685
Change in fair value	(95,264)	(1,234)
Fair value	$ 1,279,341	$ 1,061,912
Weighted average interest rate (as a percent)	4.68%	4.49%
Weighted average remaining maturity (years)	31 years	30 years
Number of mortgage loans 90 or more days past due \| loan	4	8
Recorded investment in mortgage loans 90 or more days past due	$ 1,530	$ 3,241
Unpaid principal balance of loans 90 or more days past due	$ 1,683	$ 3,100
Number of mortgage loans in foreclosure \| loan	8	7
Recorded investment in mortgage loans in foreclosure	$ 3,291	$ 2,125
Unpaid principal balance of loans in foreclosure	$ 3,232	$ 2,113

Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due, Number

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- Definition

Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due, Unpaid Principal Balance

+ References

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- Definition

Fair Value, Option, Loans Held as Assets, Foreclosure, Number

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- Definition

Fair Value, Option, Loans Held as Assets, Foreclosure, Unpaid Principal Balance

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- Definition

Financing Receivable, After Allowance for Credit Loss, Before Fair Value Option Adjustment, Unpaid Principal Balance

+ References

No definition available.

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- Definition

Financing Receivable, at Cost

+ References

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- Definition

Financing Receivable, Weighted Average Interest Rate

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Financing Receivable, Weighted Average Remaining Maturity

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- References

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- Definition

This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans and long-term receivables (other than securities categorized as trading, available-for-sale or held-to-maturity) that have contractual principal amounts and for which the fair value option has been elected.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (d)(1)
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- Definition

This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected.

+ References

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-Publisher FASB
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- Definition

Amount of unamortized purchase premium (discount) on financing receivable. Excludes financing receivable covered under loss sharing agreement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
-Section 45
-Paragraph 1
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- Definition

Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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