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Other Real Estate Owned (OREO) - Summary of Changes in the Balance for OREO (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Real Estate [Abstract]    
Balance at the beginning of year, gross $ 250 $ 2,903
Transfers in 0 287
Charge-offs 0 (251)
Sales proceeds 0 (2,882)
Gain on disposition 0 193
Balance at the end of period, gross 250 250
Less: valuation allowance 0 0
Balance at the end of period, net $ 250 $ 250 [1]
[1] Derived from audited consolidated financial statements.