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Summary of Commitments to Extend Credit (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Unfunded Commitments To Extend Credit [Line Items]    
Fixed rate $ 1,554 $ 1,113
Adjustable rate 11,640 1,366
Unfunded Commitments to Extend Credit 55,980 42,622
Unused lines of credit on credit cards
    
Unfunded Commitments To Extend Credit [Line Items]    
Unfunded Commitments to Extend Credit 2,981 2,942
Undisbursed commercial and personal lines of credit
    
Unfunded Commitments To Extend Credit [Line Items]    
Unfunded Commitments to Extend Credit 17,413 15,748
Undisbursed portion of construction loans in process
    
Unfunded Commitments To Extend Credit [Line Items]    
Unfunded Commitments to Extend Credit 4,306 4,768
Undisbursed portion of home equity lines of credit
    
Unfunded Commitments To Extend Credit [Line Items]    
Unfunded Commitments to Extend Credit $ 18,086 $ 16,685