Other Real Estate Owned Net - Summary of Properties Included in Other Real Estate Owned (OREO) (Detail) $ in Thousands	Jun. 30, 2017 USD ($) Property	Dec. 31, 2016 USD ($) Property
Real Estate Properties [Line Items]
No. of Properties | Property	30	14
Carrying Value | $	$ 5,360	$ 2,494	[1]
Land lots
Real Estate Properties [Line Items]
No. of Properties | Property	18	7
Carrying Value | $	$ 3,196	$ 547
Convenience Stores
Real Estate Properties [Line Items]
No. of Properties | Property	1	1
Carrying Value | $	$ 59	$ 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	5	3
Carrying Value | $	$ 1,071	$ 942
Residential
Real Estate Properties [Line Items]
No. of Properties | Property	5	2
Carrying Value | $	$ 979	$ 891

[1] Derived from the audited December 31, 2016 Consolidated Financial Statements