Fair Value of Assets and Liabilities - Summary of Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2022		Jun. 30, 2022	Dec. 31, 2021		Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Assets
Impaired loans	$ 19,600			$ 20,500
Mortgage Loans in Process of Foreclosure, Amount	24,331	[1]	$ 26,974	37,430	[1]	$ 42,544	$ 49,039	$ 54,560
Fair Value, Nonrecurring
Assets
Equity investments	10,670			9,726
Impaired loans	30,780			35,571
Mortgage Loans in Process of Foreclosure, Amount	24,331			37,430
Total	65,781			82,727
Fair Value, Nonrecurring | Level 3 [Member]
Assets
Equity investments	10,670			9,726
Impaired loans	30,780			35,571
Mortgage Loans in Process of Foreclosure, Amount	24,331			37,430
Total	$ 65,781			$ 82,727

[1] Includes financed sales of this collateral to third parties that are reported separately from the loan portfolio, of $7.8 million as of September 30, 2022 and $7.4 million as of December 31, 2021