Other Real Estate Owned Net - Summary of Properties Included in Other Real Estate Owned (OREO) (Detail) $ in Thousands	Sep. 30, 2015 USD ($) Property	Dec. 31, 2014 USD ($) Property
Real Estate Properties [Line Items]
No. of Properties | Property	19	27
Carrying Value	$ 2,343	$ 2,791	[1]
Residential
Real Estate Properties [Line Items]
No. of Properties | Property	6	10
Carrying Value	$ 910	$ 1,559
Land lots
Real Estate Properties [Line Items]
No. of Properties | Property	7	13
Carrying Value	$ 442	$ 587
Convenience Stores
Real Estate Properties [Line Items]
No. of Properties | Property	2	2
Carrying Value	$ 191	$ 234
Restaurant
Real Estate Properties [Line Items]
No. of Properties | Property	1	1
Carrying Value	$ 107	$ 107
Commercial properties
Real Estate Properties [Line Items]
No. of Properties | Property	3	1
Carrying Value	$ 693	$ 304

[1] Derived from the audited consolidated financial statements.