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Premises and Equipment - Summary of Minimum Annual Rental Commitments Under Sale Lease Back (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
2014 $ 112us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinOneYear
2015 112us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinTwoYears
2016 112us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinThreeYears
2017 112us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinFourYears
2018 112us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinFiveYears
Thereafter 781us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsThereafter
Total $ 1,341us-gaap_MinimumLeasePaymentsSaleLeasebackTransactions