Other Real Estate Owned Net - Summary of Properties Included in Other Real Estate Owned (OREO) (Detail) $ in Thousands	Mar. 31, 2017 USD ($) Property	Dec. 31, 2016 USD ($) Property
Real Estate Properties [Line Items]
No. of Properties | Property	14	14
Carrying Value | $	$ 2,436	$ 2,494
Land lots
Real Estate Properties [Line Items]
No. of Properties | Property	7	7
Carrying Value | $	$ 586	$ 547
Convenience Stores
Real Estate Properties [Line Items]
No. of Properties | Property	1	1
Carrying Value | $	$ 60	$ 59
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 | $	$ 904	$ 942
Residential
Real Estate Properties [Line Items]
No. of Properties | Property	2	2
Carrying Value | $	$ 831	$ 891