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Other Real Estate Owned - Summary of Activity Related to Total OREO (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]    
Balance, beginning of period $ 420 $ 4,527
Additions 4,889 420
Dispositions (420) (4,527)
Valuation adjustments 0  
Balance, end of period $ 4,889 $ 420