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Allowance for Loan Losses (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Ending allowance balance attributable to loans:            
Individually evaluated for impairment $ 1,394   $ 1,529      
Collectively evaluated for impairment 3,672   3,393      
Acquired with deteriorated credit quality 0   0      
Ending balance 5,066 5,011 4,922 4,835 4,792 4,736
Residential
            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 61   112      
Collectively evaluated for impairment 782   699      
Acquired with deteriorated credit quality 0   0      
Ending balance 843 838 811 905 940 922
Land
            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 153   152      
Acquired with deteriorated credit quality 0   0      
Ending balance 153 144 152 73 69 71
Construction
            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 78   63      
Acquired with deteriorated credit quality 0   0      
Ending balance 78 70 63 60 50 0
Commercial Real Estate
            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 107   145      
Collectively evaluated for impairment 1,173   1,139      
Acquired with deteriorated credit quality 0   0      
Ending balance 1,280 1,276 1,284 1,291 1,291 1,310
Commercial Business
            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 1,226   1,259      
Collectively evaluated for impairment 218   187      
Acquired with deteriorated credit quality 0   0      
Ending balance 1,444 1,450 1,446 1,260 1,226 1,223
Home Equity and Second Mortgage
            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 0   13      
Collectively evaluated for impairment 932   864      
Acquired with deteriorated credit quality 0   0      
Ending balance 932 902 877 894 886 919
Other Consumer
            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 336   289      
Acquired with deteriorated credit quality 0   0      
Ending balance $ 336 $ 331 $ 289 $ 352 $ 330 $ 291