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Loans and Allowance for Loan Losses - Related Party Loans (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Receivables [Abstract]      
Balance Beginning of the Period $ 27,134us-gaap_LoansAndLeasesReceivableRelatedParties $ 29,030us-gaap_LoansAndLeasesReceivableRelatedParties $ 25,264us-gaap_LoansAndLeasesReceivableRelatedParties
Additions 22,521us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions 11,979us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions 24,706us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions
Collections/ Terminations (24,636)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections (13,875)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections (20,940)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
Balance End of the Period $ 25,019us-gaap_LoansAndLeasesReceivableRelatedParties $ 27,134us-gaap_LoansAndLeasesReceivableRelatedParties $ 29,030us-gaap_LoansAndLeasesReceivableRelatedParties