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Information in Regard to Troubled Debt Restructurings that Occurred During Period (Detail) (Troubled Debt Restructuring, USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Contract
Dec. 31, 2011
Contract
Financing Receivable, Modifications [Line Items]    
Number of Contracts 5 10
Pre-Modification Outstanding Balance $ 335 $ 2,067
Post-Modification Outstanding Balance 335 2,067
Residential
    
Financing Receivable, Modifications [Line Items]    
Number of Contracts 3 4
Pre-Modification Outstanding Balance 270 331
Post-Modification Outstanding Balance 270 331
Land
    
Financing Receivable, Modifications [Line Items]    
Number of Contracts   1
Pre-Modification Outstanding Balance   135
Post-Modification Outstanding Balance   135
Construction
    
Financing Receivable, Modifications [Line Items]    
Number of Contracts   2
Pre-Modification Outstanding Balance   454
Post-Modification Outstanding Balance   454
Commercial Real Estate
    
Financing Receivable, Modifications [Line Items]    
Number of Contracts   2
Pre-Modification Outstanding Balance   1,139
Post-Modification Outstanding Balance   1,139
Home Equity and Second Mortgage
    
Financing Receivable, Modifications [Line Items]    
Number of Contracts 2 1
Pre-Modification Outstanding Balance 65 8
Post-Modification Outstanding Balance $ 65 $ 8