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Troubled Debt Restructurings Defaulted During Period (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Financing Receivable, Modifications [Line Items]    
Recorded Investment $ 175 $ 2,567
Charge-Offs 98 0
Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Recorded Investment 0 2,079
Charge-Offs 0 0
Consumer Loans
    
Financing Receivable, Modifications [Line Items]    
Recorded Investment 2 488
Charge-Offs 2 0
Subsequent Default Number Of Loans 1 3
1-4 Family - closed end | Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Recorded Investment 0 93
Charge-Offs 0 0
Subsequent Default Number Of Loans 0 1
Equity Lines | Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Recorded Investment 0 213
Charge-Offs 0 0
Subsequent Default Number Of Loans 0 1
Commercial real estate - owner occupied | Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Recorded Investment 0 1,773
Charge-Offs 0 0
Subsequent Default Number Of Loans 0 2
Agricultural
    
Financing Receivable, Modifications [Line Items]    
Recorded Investment 0 0
Charge-Offs 0 0
Subsequent Default Number Of Loans 0 0
Commercial and Industrial
    
Financing Receivable, Modifications [Line Items]    
Recorded Investment 173 0
Charge-Offs 96 0
Subsequent Default Number Of Loans 2 0
Small Business Loans
    
Financing Receivable, Modifications [Line Items]    
Recorded Investment 0 0
Charge-Offs $ 0 $ 0
Subsequent Default Number Of Loans 0 0