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Loans - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
SecurityLoan
TDRs
Dec. 31, 2012
Receivables [Abstract]    
Financing receivable, recorded investment, 90 days past due and still accruing $ 0 $ 0
Maximum period of noncovered loans past due and accruing 90 days 90 days
Accrued interest receivable for loans 2,553,000 2,708,000
TDR four loan totaling 707,000  
Other performing TDR not defaulted subsequent to restructuring or to the date financial statements available 0  
Number of loans modified as TDR in current year 4  
Troubled debt restructuring performed $ 0