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Financial Instruments with Off-Balance Sheet Risk - Summary of Financial Instruments whose Contract Amount Represents Credit Risk (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Off Balance Sheet Financing [Line Items]    
Fair value of financial instruments $ 1,778us-gaap_LettersOfCreditOutstandingAmount $ 679us-gaap_LettersOfCreditOutstandingAmount
Commitments to Extend Credit [Member]    
Off Balance Sheet Financing [Line Items]    
Fair value of financial instruments $ 126,387us-gaap_UnusedCommitmentsToExtendCredit
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember		 $ 119,571us-gaap_UnusedCommitmentsToExtendCredit
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember