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Guarantees, Commitments and Contingencies - Summary of Commitments and Contingent Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Summary Of Commitments And Contingent Liabilities [Line Items]    
Commitments and contingent liabilities      
Standby Letters of Credit [Member]    
Summary Of Commitments And Contingent Liabilities [Line Items]    
Commitments and contingent liabilities 833us-gaap_CommitmentsAndContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_StandbyLettersOfCreditMember
931us-gaap_CommitmentsAndContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_StandbyLettersOfCreditMember
Commitments to Extend Credit [Member]    
Summary Of Commitments And Contingent Liabilities [Line Items]    
Commitments and contingent liabilities $ 31,644us-gaap_CommitmentsAndContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_CommitmentsToExtendCreditMember
$ 28,875us-gaap_CommitmentsAndContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_CommitmentsToExtendCreditMember