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Loans - Contractual Maturity Schedule by Major Category of Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | $ 823,771 | $ 758,820
Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 64,073 | 62,375
Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 95,111 | 84,563
Industrial Development Bonds [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 6,415 | 5,732
Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 83,620 | 86,234
Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 410,520 | 377,481
Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 37,757 | 33,179
Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 126,275 | $ 109,256
Major Category Of Receivables Due Within One Year [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 169,788 |
Major Category Of Receivables Due Within One Year [Member] | Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 756 |
Major Category Of Receivables Due Within One Year [Member] | Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 60,164 |
Major Category Of Receivables Due Within One Year [Member] | Industrial Development Bonds [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 800 |
Major Category Of Receivables Due Within One Year [Member] | Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 1,185 |
Major Category Of Receivables Due Within One Year [Member] | Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 29,728 |
Major Category Of Receivables Due Within One Year [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 5,634 |
Major Category Of Receivables Due Within One Year [Member] | Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 71,521 |
Major Category Of Receivables Due Within One Year to Five Years [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 231,495 |
Major Category Of Receivables Due Within One Year to Five Years [Member] | Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 5,910 |
Major Category Of Receivables Due Within One Year to Five Years [Member] | Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 25,499 |
Major Category Of Receivables Due Within One Year to Five Years [Member] | Industrial Development Bonds [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 65 |
Major Category Of Receivables Due Within One Year to Five Years [Member] | Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 13,979 |
Major Category Of Receivables Due Within One Year to Five Years [Member] | Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 125,694 |
Major Category Of Receivables Due Within One Year to Five Years [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 23,946 |
Major Category Of Receivables Due Within One Year to Five Years [Member] | Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 36,402 |
Major Category Of Receivables Over Five Years [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 422,488 |
Major Category Of Receivables Over Five Years [Member] | Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 57,407 |
Major Category Of Receivables Over Five Years [Member] | Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 9,448 |
Major Category Of Receivables Over Five Years [Member] | Industrial Development Bonds [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 5,550 |
Major Category Of Receivables Over Five Years [Member] | Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 68,456 |
Major Category Of Receivables Over Five Years [Member] | Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 255,098 |
Major Category Of Receivables Over Five Years [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 8,177 |
Major Category Of Receivables Over Five Years [Member] | Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | $ 18,352 |

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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