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Troubled Debt Restructurings Defaulted During Period (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Financing Receivable, Modifications [Line Items]    
Recorded Investment $ 1,217 $ 1,545
Charge-Offs 368 591
Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Recorded Investment 1,087 1,239
Charge-Offs 304 351
Consumer Loans
    
Financing Receivable, Modifications [Line Items]    
Recorded Investment 65 67
Charge-Offs 64 66
Subsequent Default Number Of Loans 3 4
1-4 Family - closed end | Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Recorded Investment 779 779
Charge-Offs 94 94
Subsequent Default Number Of Loans 2 2
Equity Lines | Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Recorded Investment 0 0
Charge-Offs 0 0
Subsequent Default Number Of Loans 0 0
Commercial real estate - owner occupied | Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Recorded Investment 308 308
Charge-Offs 210 210
Subsequent Default Number Of Loans 1 1
Commercial and Industrial
    
Financing Receivable, Modifications [Line Items]    
Recorded Investment 65 239
Charge-Offs 0 174
Subsequent Default Number Of Loans 2 5
Small Business Loans
    
Financing Receivable, Modifications [Line Items]    
Recorded Investment 0 0
Charge-Offs 0 0
Subsequent Default Number Of Loans 0 0
Other construction/Land | Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Recorded Investment 0 152
Charge-Offs $ 0 $ 47
Subsequent Default Number Of Loans 0 1