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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, 2016 | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | $ 958 | $ 2,190 |
Current | 737,724 | 683,688 |
Loans after net deferred loan fees and costs | 738,682 | 685,878 | $ 635,239
Recorded Investment > 90 Days and Accruing | 0 | 0 | 0
Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 132 | 162 |
Current | 60,030 | 58,301 |
Loans after net deferred loan fees and costs | 60,162 | 58,463 | 54,995
Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | 145 |
Current | 79,332 | 82,617 |
Loans after net deferred loan fees and costs | 79,332 | 82,762 | 73,310
Commercial And Industrial and Industrial Development Bonds [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 46 | 71 |
Current | 111,907 | 106,618 |
Loans after net deferred loan fees and costs | 111,953 | 106,689 | 91,114
Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 371 | 707 |
Current | 86,527 | 87,240 |
Loans after net deferred loan fees and costs | 86,898 | 87,947 | 88,020
Recorded Investment > 90 Days and Accruing | 0 | 0 |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 395 | 1,077 |
Current | 369,326 | 321,153 |
Loans after net deferred loan fees and costs | 369,721 | 322,230 | 301,342
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 14 | 28 |
Current | 30,602 | 27,759 |
Loans after net deferred loan fees and costs | 30,616 | 27,787 | $ 26,458
30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 170 | 609 |
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 |  | 51 |
30 to 59 Days Past Due [Member] | Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 160 | 303 |
30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | 236 |
30 to 59 Days Past Due [Member] | Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 10 | 19 |
60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 399 | 201 |
60 to 89 Days Past Due [Member] | Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | 145 |
60 to 89 Days Past Due [Member] | Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 0 | 47 |
60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 395 |  |
60 to 89 Days Past Due [Member] | Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 4 | 9 |
Greater Than 90 Days [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 389 | 1,380 |
Greater Than 90 Days [Member] | Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 132 | 162 |
Greater Than 90 Days [Member] | Commercial And Industrial and Industrial Development Bonds [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | 46 | 20 |
Greater Than 90 Days [Member] | Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due | $ 211 | 357 |
Greater Than 90 Days [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Past Due |  | $ 841 |

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