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Loans - Summary of Activities in Allowance for Credit Losses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Loan Losses                      
Balance at beginning of year       $ 5,224       $ 5,091 $ 5,224 $ 5,091 $ 5,706
Provision for loan loss 276 303 112 167 296 236 78 128 858 738 1,715
Loans charged off                 (1,262) (891) (2,681)
Recoveries                 374 286 351
Balance at ending of year 5,194       5,224       5,194 5,224 5,091
Allowance for Unfunded Loan Commitments & Letters of Credit 163       162       163 162 130
Total Allowance for Credit Losses $ 5,357       $ 5,386       $ 5,357 $ 5,386 $ 5,221