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Loans - Risk Category of Loans by Portfolio Segment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	$ 583,170	$ 576,343
Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	49,629	44,301
Agricultural Real Estate [Member] | 1-2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	3,510	3,764
Agricultural Real Estate [Member] | 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	15,139	14,588
Agricultural Real Estate [Member] | 4 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	30,363	25,186
Agricultural Real Estate [Member] | 5 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	584	729
Agricultural Real Estate [Member] | 6 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	33	34
Agricultural Real Estate [Member] | 7 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross
Agricultural Real Estate [Member] | 8 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	64,859	65,449
Agricultural [Member] | 1-2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	6,803	9,263
Agricultural [Member] | 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	25,732	27,212
Agricultural [Member] | 4 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	32,304	28,974
Agricultural [Member] | 5 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	20
Agricultural [Member] | 6 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross
Agricultural [Member] | 7 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross
Agricultural [Member] | 8 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	261,634	248,893
Commercial Real Estate [Member] | 1-2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	1,113	1,104
Commercial Real Estate [Member] | 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	53,771	55,060
Commercial Real Estate [Member] | 4 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	199,701	182,277
Commercial Real Estate [Member] | 5 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	1,978	4,987
Commercial Real Estate [Member] | 6 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	5,039	5,092
Commercial Real Estate [Member] | 7 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	32	373
Commercial Real Estate [Member] | 8 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	90,024	99,498
Commercial and Industrial [Member] | 1-2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	1,817	2,525
Commercial and Industrial [Member] | 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	20,615	21,610
Commercial and Industrial [Member] | 4 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	64,399	72,059
Commercial and Industrial [Member] | 5 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	2,074	2,119
Commercial and Industrial [Member] | 6 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	717	758
Commercial and Industrial [Member] | 7 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	402	427
Commercial and Industrial [Member] | 8 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross
Industrial Development Bonds [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	4,334	4,358
Industrial Development Bonds [Member] | 1-2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross
Industrial Development Bonds [Member] | 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	3,845	3,869
Industrial Development Bonds [Member] | 4 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross	489	489
Industrial Development Bonds [Member] | 5 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross
Industrial Development Bonds [Member] | 6 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross
Industrial Development Bonds [Member] | 7 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross
Industrial Development Bonds [Member] | 8 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - Gross

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X

- 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=28367877&loc=d3e4428-111522

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