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Disclosure About Fair Value of Financial Instruments - Schedule of Assets Measured at Fair Value on a Non-recurring Basis (Detail) - Fair Value Measurements, Nonrecurring [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Losses (charged off amount) adjustments to the assets at fair value $ 142 $ 437
Assets measured at fair value on a nonrecurring basis 124 431
Repossessed Assets [Member] | Level 3 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis $ 124 $ 431