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Loans - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Classification of Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | $ 2,232 | $ 2,285 |
Current | 633,007 | 619,641 |
Loans after net deferred loan fees and costs | 635,239 | 621,926 | $ 608,604
Recorded Investment > 90 Days and Accruing | 0 | 0 | 0
Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 222 |  |
Current | 54,773 | 50,895 |
Loans after net deferred loan fees and costs | 54,995 | 50,895 | 48,812
Recorded Investment > 90 Days and Accruing | 0 | 0 |
Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | 25 |
Current | 73,310 | 74,586 |
Loans after net deferred loan fees and costs | 73,310 | 74,611 | 67,221
Recorded Investment > 90 Days and Accruing | 0 | 0 |
Commercial And Industrial and Industrial Development Bonds [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 30 | 8 |
Current | 91,084 | 104,816 |
Loans after net deferred loan fees and costs | 91,114 | 104,824 | 97,780
Recorded Investment > 90 Days and Accruing | 0 | 0 |
Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 926 | 1,199 |
Current | 87,094 | 96,351 |
Loans after net deferred loan fees and costs | 88,020 | 97,550 | 97,651
Recorded Investment > 90 Days and Accruing | 0 | 0 |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 1,032 | 991 |
Current | 300,310 | 269,197 |
Loans after net deferred loan fees and costs | 301,342 | 270,188 | 274,074
Recorded Investment > 90 Days and Accruing | 0 | 0 |
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 22 | 62 |
Current | 26,436 | 23,796 |
Loans after net deferred loan fees and costs | 26,458 | 23,858 | $ 23,066
Recorded Investment > 90 Days and Accruing | 0 | 0 |
30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 491 | 841 |
30 to 59 Days Past Due [Member] | Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | 25 |
30 to 59 Days Past Due [Member] | Commercial And Industrial and Industrial Development Bonds [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 20 |  |
30 to 59 Days Past Due [Member] | Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 441 | 713 |
30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 8 | 78 |
30 to 59 Days Past Due [Member] | Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 22 | 25 |
60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 233 | 270 |
60 to 89 Days Past Due [Member] | Commercial And Industrial and Industrial Development Bonds [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | 8 |
60 to 89 Days Past Due [Member] | Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 233 | 50 |
60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | 204 |
60 to 89 Days Past Due [Member] | Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | 8 |
Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 1,508 | 1,174 |
Greater Than 90 Days [Member] | Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 222 |  |
Greater Than 90 Days [Member] | Commercial And Industrial and Industrial Development Bonds [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 10 |  |
Greater Than 90 Days [Member] | Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 252 | 436 |
Greater Than 90 Days [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | $ 1,024 | 709 |
Greater Than 90 Days [Member] | Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | $ 29 |

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