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Loans - Maturity Schedule by Major Category of Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	$ 760,875	$ 686,516
Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	63,391	58,525
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	84,563	82,654
Industrial Development Bonds [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	5,732	6,491
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	87,273	88,189
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	377,481	322,762
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	33,179	27,770
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	109,256	$ 100,125
Major Category Of Receivables Due Within One Year [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	119,526
Major Category Of Receivables Due Within One Year [Member] | Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	911
Major Category Of Receivables Due Within One Year [Member] | Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	51,411
Major Category Of Receivables Due Within One Year [Member] | Industrial Development Bonds [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	1,031
Major Category Of Receivables Due Within One Year [Member] | Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	2,900
Major Category Of Receivables Due Within One Year [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	7,636
Major Category Of Receivables Due Within One Year [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	5,880
Major Category Of Receivables Due Within One Year [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	49,757
Major Category Of Receivables Due Within One Year to Five Years [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	199,259
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	3,156
Major Category Of Receivables Due Within One Year to Five Years [Member] | Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	22,771
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	85
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	12,258
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	105,377
Major Category Of Receivables Due Within One Year to Five Years [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	20,212
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	35,400
Major Category Of Receivables Over Five Years [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	442,090
Major Category Of Receivables Over Five Years [Member] | Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	59,324
Major Category Of Receivables Over Five Years [Member] | Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	10,381
Major Category Of Receivables Over Five Years [Member] | Industrial Development Bonds [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	4,616
Major Category Of Receivables Over Five Years [Member] | Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	72,115
Major Category Of Receivables Over Five Years [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	264,468
Major Category Of Receivables Over Five Years [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	7,087
Major Category Of Receivables Over Five Years [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	$ 24,099

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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=65884687&loc=d3e4428-111522

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