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Loans - Impaired Loans Classified as Troubled Debt Restructured (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Agricultural Real Estate [Member]
Contract
Sep. 30, 2014
Agricultural Real Estate [Member]
Contract
Sep. 30, 2013
Commercial and Industrial [Member]
Contract
Sep. 30, 2013
Commercial and Industrial [Member]
Contract
Financing Receivable, Modifications [Line Items]        
Number of Contracts Modified, Troubled Debt Restructurings 0 2 0 1
Pre- Modification Outstanding Recorded Investment $ 0 $ 153 $ 0 $ 81
Post- Modification Outstanding Recorded Investment $ 0 $ 141 $ 0 $ 43