Fair Value - Summary of Additional Information about Unobservable Inputs Used in Fair Value Measurement (Detail) - Fair Value, Measurements, Nonrecurring [Member] - Level 3 [Member] $ in Thousands	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Individually Evaluated Real Estate Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	$ 16,764	$ 16,535
Individually Evaluated Real Estate Loans [Member] | Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range	0.05	0.03
Individually Evaluated Real Estate Loans [Member] | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range	0.40	0.34
Individually Evaluated Real Estate Loans [Member] | Weighted Average [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range	0.22	0.19
Individually Evaluated Real Estate Loans [Member] | Cost Approach
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	$ 1,577
Individually Evaluated Real Estate Loans [Member] | Cost Approach | Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range	0.26
Individually Evaluated Real Estate Loans [Member] | Cost Approach | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range	0.70
Individually Evaluated Real Estate Loans [Member] | Cost Approach | Weighted Average [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range	0.29
Individually Evaluated Other Real Estate Owned [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	$ 2,198	$ 1,231
Individually Evaluated Other Real Estate Owned [Member] | Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range	0.03	0.07
Individually Evaluated Other Real Estate Owned [Member] | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range	0.13	0.28
Individually Evaluated Other Real Estate Owned [Member] | Weighted Average [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range	0.08	0.18