Loans and Allowance for Credit Losses - Summary of outstanding loans (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loans
Loans	$ 514,537,000	$ 512,516,000
% of Total Loans	100.00%	100.00%
Deferred loan fees, net	(116,000)	(159,000)
Total gross loans	514,421,000	512,357,000
Allowance for credit losses	(8,321,000)	(9,208,000)	(9,208,000)
Total loans	506,100,000	503,149,000
Small Business Administration programs
Loans
Real estate and commercial loans	7,236,000	7,345,000
Commercial
Loans
Loans	112,322,000	118,731,000
% of Total Loans	21.80%	23.10%
Real Estate Portfolio Segment
Loans
Loans	343,845,000	333,939,000
% of Total Loans	66.80%	65.20%
Real estate
Loans
Loans	343,845,000	333,939,000
Consumer
Loans
Loans	58,370,000	59,846,000
% of Total Loans	11.40%	11.70%
Commercial and industrial
Loans
Loans	87,353,000	87,082,000
% of Total Loans	17.00%	17.00%
Agricultural land and production
Loans
Loans	24,969,000	31,649,000
% of Total Loans	4.80%	6.10%
Owner occupied
Loans
Loans	159,343,000	156,781,000
% of Total Loans	31.00%	30.60%
Real estate construction and other land loans
Loans
Loans	37,081,000	42,329,000
% of Total Loans	7.20%	8.30%
Commercial real estate
Loans
Loans	90,794,000	86,117,000
% of Total Loans	17.60%	16.80%
Agricultural real estate
Loans
Loans	52,107,000	44,164,000
% of Total Loans	10.10%	8.60%
Other real estate
Loans
Loans	4,520,000	4,548,000
% of Total Loans	0.90%	0.90%
Equity loans and lines of credit
Loans
Loans	47,210,000	48,594,000
% of Total Loans	9.20%	9.50%
Consumer and installment
Loans
Loans	11,160,000	11,252,000
% of Total Loans	2.20%	2.20%
Acquired During Period
Loans
Total loans	$ 92,000,000	$ 100,000,000

Loans and Leases Receivable, Gross, Real Estate and Commercial

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Loans and Leases Receivable, Percentage of Gross Loans

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for 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 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)(1)(ii)

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

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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.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ 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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7)

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Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for 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 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533

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