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Other Real Estate Owned (OREO) - Summary of Changes in the Balance for OREO (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Real Estate [Abstract]    
Balance at the beginning of year, gross $ 326 $ 250
Transfers in 0 326
Charge-offs 0 0
Sales proceeds (350) (441)
Gain on disposition 24 191
Balance at the end of period, gross 0 326
Less: valuation allowance 0 0
Balance at the end of period, net $ 0 $ 326 [1]
[1] Derived from audited consolidated financial statements.