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Loans - Summary of Loans to Related Parties (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Loans and Leases Receivable, Related Parties Disclosure [Abstract]      
Beginning balance $ 6,761us-gaap_LoansAndLeasesReceivableRelatedParties $ 6,310us-gaap_LoansAndLeasesReceivableRelatedParties $ 5,681us-gaap_LoansAndLeasesReceivableRelatedParties
New loans and advances 2,516us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions 1,647us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions 3,755us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions
Repayments (1,517)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections (1,196)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections (3,126)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
Ending balance $ 7,760us-gaap_LoansAndLeasesReceivableRelatedParties $ 6,761us-gaap_LoansAndLeasesReceivableRelatedParties $ 6,310us-gaap_LoansAndLeasesReceivableRelatedParties