Other Real Estate Owned Net - Summary of Properties Included in Other Real Estate Owned (OREO) (Detail) $ in Thousands	Dec. 31, 2016 USD ($) Property	Dec. 31, 2015 USD ($) Property
Real Estate Properties [Line Items]
No. of Properties | Property	14	16
Carrying Value | $	$ 2,494	$ 1,870
Residential
Real Estate Properties [Line Items]
No. of Properties | Property	2	3
Carrying Value | $	$ 891	$ 540
Land lots
Real Estate Properties [Line Items]
No. of Properties | Property	7	7
Carrying Value | $	$ 547	$ 413
Convenience Stores
Real Estate Properties [Line Items]
No. of Properties | Property	1	2
Carrying Value | $	$ 59	$ 191
Restaurant
Real Estate Properties [Line Items]
No. of Properties | Property	1	1
Carrying Value | $	$ 55	$ 55
Commercial properties
Real Estate Properties [Line Items]
No. of Properties | Property	3	3
Carrying Value | $	$ 942	$ 671