Fair Value Measurements - Summary of Assets Measured at Fair Value on Nonrecurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans, net	$ 1,958	$ 2,077
Other real estate owned, net	2,791	3,897
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans, net	1,958	2,077
Other real estate owned, net	$ 2,791	$ 3,897