Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - Non-recurring Basis - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent loans	$ 37,226	$ 63,114
Other real estate owned	1,545	2,360
Repossessed personal property	681	857
Quoted Prices in Active Markets for Identical Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent loans	0	0
Other real estate owned	0	0
Repossessed personal property	0	0
Significant Observable Inputs with No Active Market with Identical Characteristics
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent loans	0	0
Other real estate owned	0	0
Repossessed personal property	0	0
Significant Unobservable Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent loans	37,226	63,114
Other real estate owned	1,545	2,360
Repossessed personal property	$ 681	$ 857