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Loans - Contractual Maturity Schedule by Major Category of Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | $ 839,508 | $ 823,771
Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 83,134 | 83,620
Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 68,548 | 64,073
Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 103,624 | 95,111
Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 417,217 | 410,520
Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 119,536 | 126,275
Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 41,444 | 37,757
Major Category Of Receivables Due Within One Year [Member] | Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 4,537 |
Major Category Of Receivables Due Within One Year [Member] | Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 1,168 |
Major Category Of Receivables Due Within One Year [Member] | Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 65,987 |
Major Category Of Receivables Due Within One Year [Member] | Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 16,295 |
Major Category Of Receivables Due Within One Year [Member] | Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 64,513 |
Major Category Of Receivables Due Within One Year [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 4,960 |
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 | 16,239 |
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 | 5,448 |
Major Category Of Receivables Due Within One Year to Five Years [Member] | Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 25,287 |
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 | 146,828 |
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 | 46,655 |
Major Category Of Receivables Due Within One Year to Five Years [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 26,926 |
Major Category Of Receivables Over Five Years [Member] | Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 62,358 |
Major Category Of Receivables Over Five Years [Member] | Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 61,932 |
Major Category Of Receivables Over Five Years [Member] | Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 12,350 |
Major Category Of Receivables Over Five Years [Member] | Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 254,094 |
Major Category Of Receivables Over Five Years [Member] | Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 8,368 |
Major Category Of Receivables Over Five Years [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 9,558 |
Industrial Development Bonds [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 6,005 | $ 6,415
Industrial Development Bonds [Member] | Major Category Of Receivables Due Within One Year [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 600 |
Industrial Development Bonds [Member] | Major Category Of Receivables Due Within One Year to Five Years [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | 65 |
Industrial Development Bonds [Member] | Major Category Of Receivables Over Five Years [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans - Gross | $ 5,340 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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