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 |