Annual report pursuant to Section 13 and 15(d)

Other Financing Lines of Credit - Summary Of Components of other financing lines of credit (Detail)

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Other Financing Lines of Credit - Summary Of Components of other financing lines of credit (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Line of Credit Facility [Line Items]    
Total Capacity [1] $ 6,540,329  
Outstanding borrowings 3,347,442 $ 2,973,743
Mortgage Line Of Credit [Member]    
Line of Credit Facility [Line Items]    
Total Capacity [1] 3,876,559  
Outstanding borrowings 1,996,538 1,997,464
Reverse Line Of Credit [Member]    
Line of Credit Facility [Line Items]    
Total Capacity [1] 1,863,729  
Outstanding borrowings 1,129,402 767,959
Commercial Lines Of Credit [Member]    
Line of Credit Facility [Line Items]    
Total Capacity [1] 800,041  
Outstanding borrowings $ 221,502 208,320
March 2026 | Mortgage Line Of Credit [Member]    
Line of Credit Facility [Line Items]    
Maturity date March 2026  
Interest rate LIBOR/AMERIBOR + applicable margin  
Collateral pledge MSRs  
Total Capacity [1] $ 150,000  
Outstanding borrowings $ 138,524 0
April 2022 - September 2023 | Reverse Line Of Credit [Member]    
Line of Credit Facility [Line Items]    
Maturity date April 2022 - September 2023  
Interest rate Bond accrual rate + applicable margin  
Collateral pledge Mortgage Related Assets  
Total Capacity [1] $ 398,729  
Outstanding borrowings $ 297,893 252,880
February 2024 | Reverse Line Of Credit [Member]    
Line of Credit Facility [Line Items]    
Maturity date February 2024  
Interest rate LIBOR + applicable margin  
Collateral pledge MSRs  
Total Capacity [1] $ 90,000  
Outstanding borrowings $ 78,952 0
April 2022 | Reverse Line Of Credit [Member]    
Line of Credit Facility [Line Items]    
Maturity date April 2022  
Interest rate Prime + .50%; 6% floor  
Collateral pledge Unsecuritized Tails  
Total Capacity [1] $ 50,000  
Outstanding borrowings $ 38,544 37,442
February 2022 - November 2023 | Commercial Lines Of Credit [Member]    
Line of Credit Facility [Line Items]    
Maturity date February 2022 - November 2023  
Interest rate LIBOR/SOFR + applicable margin  
Collateral pledge Encumbered Agricultural Loans  
Total Capacity [1] $ 225,000  
Outstanding borrowings $ 25,127 52,300
August 2022 - September 2022 | Commercial Lines Of Credit [Member]    
Line of Credit Facility [Line Items]    
Maturity date August 2022 -September 2022  
Interest rate LIBOR + applicable margin  
Collateral pledge First Lien Mortgages  
Total Capacity [1] $ 545,000  
Outstanding borrowings $ 167,159 128,134
August 2022 | Commercial Lines Of Credit [Member]    
Line of Credit Facility [Line Items]    
Maturity date August 2022  
Interest rate 10%  
Collateral pledge Second Lien Mortgages  
Total Capacity [1] $ 25,000  
Outstanding borrowings $ 24,175 21,475
Mortgage Related Assets | Commercial Lines Of Credit [Member]    
Line of Credit Facility [Line Items]    
Interest rate LIBOR + applicable margin  
Collateral pledge Mortgage Related Assets  
Total Capacity [1] $ 5,041  
Outstanding borrowings $ 5,041 6,411
March 2022 - June 2023 | Mortgage Line Of Credit [Member]    
Line of Credit Facility [Line Items]    
Maturity date March 2022 - June 2023  
Interest rate LIBOR/SOFR + applicable margin  
Collateral pledge First Lien Mortgages  
Total Capacity [1] $ 3,625,000  
Outstanding borrowings $ 1,802,348 1,997,464
February 2022 - March 2022 | Mortgage Line Of Credit [Member]    
Line of Credit Facility [Line Items]    
Maturity date February 2022 - March 2022  
Interest rate LIBOR + applicable margin  
Collateral pledge Mortgage Related Assets  
Total Capacity [1] $ 101,559  
Outstanding borrowings $ 55,666  
March 2022 - April 2023 | Reverse Line Of Credit [Member]    
Line of Credit Facility [Line Items]    
Maturity date March 2022 - April 2023  
Interest rate LIBOR + applicable margin  
Collateral pledge First Lien Mortgages  
Total Capacity [1] $ 1,325,000  
Outstanding borrowings $ 714,013 $ 477,637
[1] Capacity is dependent upon maintaining compliance with, or obtaining waivers of, the terms, conditions and covenants of the respective agreements, including asset-eligibility requirements. Capacity amounts presented are as of December 31, 2021.