Fair Value of Assets and Liabilities - Summary of Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2022		Mar. 31, 2022	Dec. 31, 2021		Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Assets
Impaired loans	$ 19,700			$ 20,500
Mortgage Loans in Process of Foreclosure, Amount	26,974	[1]	$ 33,834	37,430	[1]	$ 49,039	$ 50,733	$ 54,560
Fair Value, Nonrecurring
Assets
Equity investments	10,942			9,726
Impaired loans	33,285			35,571
Mortgage Loans in Process of Foreclosure, Amount	26,974			37,430
Total	71,201			82,727
Fair Value, Nonrecurring | Level 3 [Member]
Assets
Equity investments	10,942			9,726
Impaired loans	33,285			35,571
Mortgage Loans in Process of Foreclosure, Amount	26,974			37,430
Total	$ 71,201			$ 82,727

[1] Includes financed sales of this collateral to third parties that are reported separately from the loan portfolio, of $7.7 million as of June 30, 2022 and $7.4 million as of December 31, 2021