Assets Sold Under Agreements to Repurchase - Summary of Assets Sold under Agreements to Repurchase by Counterparty (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Citibank, N.A. [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 48,619
Weighted average maturity	Sep. 01, 2024
Citibank, N.A. [Member] | Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 35,610
Weighted-average maturity, Advances	Sep. 08, 2024
Weighted-average maturity, Facility	Jun. 27, 2025
JPMorgan Chase & Co. [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 42,526
Weighted average maturity	Jul. 14, 2024
JPMorgan Chase & Co. [Member] | Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 3,275
Weighted-average maturity, Advances	Sep. 08, 2024
Weighted-average maturity, Facility	Jun. 16, 2025
Atlas Securitized Products, L.P. [Member] | Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 33,413
Weighted-average maturity, Advances	Sep. 03, 2024
Weighted-average maturity, Facility	Jun. 26, 2026
Goldman Sachs & Co. LLC [Member] | Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 10,798
Weighted-average maturity, Advances	Sep. 18, 2024
Weighted-average maturity, Facility	Dec. 08, 2025
Goldman Sachs & Co. LLC [Member] | Credit Risk Transfer Agreements [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 22,534
Weighted average maturity	Sep. 05, 2024
Bank of America, N.A. [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 13,118
Weighted average maturity	Jul. 15, 2024
Bank of America, N.A. [Member] | Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 19,043
Weighted-average maturity, Advances	Jul. 28, 2024
Weighted-average maturity, Facility	Jun. 10, 2026
Wells Fargo Securities L L C [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 27,829
Weighted average maturity	Jul. 24, 2024
Wells Fargo Securities L L C [Member] | Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 4,051
Weighted-average maturity, Advances	Sep. 23, 2024
Weighted-average maturity, Facility	May 03, 2025
Santander US Capital [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 16,765
Weighted average maturity	Jul. 21, 2024
Barclays Capital Inc. [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 25,179
Weighted average maturity	Jul. 14, 2024
Barclays Capital Inc. [Member] | Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 3,269
Weighted-average maturity, Advances	Sep. 19, 2024
Weighted-average maturity, Facility	Mar. 06, 2026
Daiwa Capital Markets America Inc. [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 5,446
Weighted average maturity	Jul. 01, 2024
Mizuho Financial Group [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 3,820
Weighted average maturity	Jul. 25, 2024
RBC Capital Markets L.P. [Member] | Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 5,535
Weighted-average maturity, Advances	Oct. 13, 2024
Weighted-average maturity, Facility	May 09, 2025
Morgan Stanley & Co. LLC [Member] | Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 3,373
Weighted-average maturity, Advances	Sep. 22, 2024
Weighted-average maturity, Facility	May 22, 2026
BNP Paribas [Member] | Mortgage loans acquired for sale, mortgage loans, REO and MSRs sold under agreements to repurchase [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 817
Weighted-average maturity, Advances	Sep. 23, 2024
Weighted-average maturity, Facility	Sep. 30, 2025
Nomura Holdings America Inc [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount at risk	$ 3,432
Weighted average maturity	Aug. 04, 2024