Quarterly report pursuant to Section 13 or 15(d)

Fair Value - Summary of Commercial Mortgage Agricultural Loans (Detail)

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Fair Value - Summary of Commercial Mortgage Agricultural Loans (Detail) - Commercial Mortgage Agricultural Loans [Member]
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Minimum [Member] | Prepayment Rate [Member]    
Fair Value Agricultural Loans Classified Under Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Prepayment rate (SMM)   9.00%
Minimum [Member] | Default Rate [Member]    
Fair Value Agricultural Loans Classified Under Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Default rate (CDR) 0.00% 0.00%
Maximum [Member] | Prepayment Rate [Member]    
Fair Value Agricultural Loans Classified Under Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Prepayment rate (SMM)   100.00%
Maximum [Member] | Default Rate [Member]    
Fair Value Agricultural Loans Classified Under Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Default rate (CDR) 1.00% 0.70%
Weighted Average [Member] | Discount rate [Member]    
Fair Value Agricultural Loans Classified Under Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Discount rate 8.10% 4.80%
Weighted Average [Member] | Prepayment Rate [Member]    
Fair Value Agricultural Loans Classified Under Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Prepayment rate (SMM) 23.10% 22.10%
Weighted Average [Member] | Default Rate [Member]    
Fair Value Agricultural Loans Classified Under Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Default rate (CDR) 1.00% 0.90%