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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, 2012 | Jun. 30, 2012
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | $ 283 | $ 570
Charge-Offs | 108 | 395
Agricultural |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 0 | 0
Commercial and Industrial |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 1 | 1
Recorded Investment | 108 | 108
Charge-Offs | 108 | 108
Consumer loans |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 0 | 1
Recorded Investment |  | 192
Charge-Offs |  | 192
Small Business Administration Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 1 | 1
Recorded Investment | 106 | 106
Real Estate Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | 69 | 164
Charge-Offs |  | 95
Real Estate Loans | Other construction/Land |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 1 | 1
Recorded Investment | 69 | 69
Real Estate Loans | 1-4 Family - closed end |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 0 | 1
Recorded Investment |  | 95
Charge-Offs |  | $ 95
Real Estate Loans | Equity Lines |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 0 | 0
Real Estate Loans | Commercial real estate - owner occupied |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 0 | 0
Real Estate Loans | Commercial real estate - non-owner occupied |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 0 | 0

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