Loans and Allowance for Credit Losses - Summary of outstanding loans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 572,442us-gaap_NotesReceivableGross	$ 512,516us-gaap_NotesReceivableGross
% of Total Loans	100.00%	100.00%
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	146	(159)
Loans and Leases Receivable, Gross	572,588	512,357
Loans, allowance for credit losses	(8,308)	(9,208)
Loans and Leases Receivable, Net Amount	564,280	503,149
Salaries and employee benefits deferred as loan origination costs	1,657	1,373	754
Acquired During Period [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net Amount	77,882	99,948
Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	176,804	156,781
% of Total Loans	30.90%	30.60%
Agricultural land and production
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	39,140	31,649
% of Total Loans	6.80%	6.10%
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	128,147	118,731
% of Total Loans	22.30%	23.10%
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	89,007	87,082
% of Total Loans	15.50%	17.00%
Real estate construction and other land loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	38,923	42,329
% of Total Loans	6.80%	8.30%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	106,788	86,117
% of Total Loans	18.70%	16.80%
Agricultural real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	57,501	44,164
% of Total Loans	10.00%	8.60%
Other real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	6,611	4,548
% of Total Loans	1.20%	0.90%
Equity loans and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	47,575	48,594
% of Total Loans	8.30%	9.50%
Consumer and installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	10,093	11,252
% of Total Loans	1.80%	2.20%
Real Estate Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	386,627	333,939
% of Total Loans	67.60%	65.20%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	57,668	59,846
% of Total Loans	10.10%	11.70%
Small Business Administration Programs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Real Estate and Commercial	8,782	7,345
Federal Home Loan Bank Advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Pledged as Collateral	183,036
Remaining borrowing capacity	290,851
Securities Pledged as Collateral \| Federal Home Loan Bank Advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investments securing FHLB advances, amortized cost	1,256	3,985
Investments securing FLHB advances, market value	$ 1,364	$ 4,084

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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Salaries and Employee Benefits Deferred As Loan Origination Costs

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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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.

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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.

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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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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.

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