Loans and Allowance for Credit Losses - Loan Portfolio Aging (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 2,338	$ 913
60-89 Days Past Due	30	88
Greater Than 90 Days Past Due	898	476
Total Past Due	3,266	1,477
Current	573,464	570,965
Loans	576,730us-gaap_NotesReceivableGross	572,442us-gaap_NotesReceivableGross
Recorded Investment Greater Than 90 Days Accruing	0	0
Non-accrual	13,696	14,052
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	124,339	128,147
Real Estate Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	398,998	386,627
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	53,393	57,668
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	886	172
60-89 Days Past Due	30	88
Greater Than 90 Days Past Due	62	0
Total Past Due	978	260
Current	89,258	88,747
Loans	90,236	89,007
Recorded Investment Greater Than 90 Days Accruing	0	0
Non-accrual	6,422	7,265
Agricultural land and production
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Greater Than 90 Days Past Due	0	0
Total Past Due	0	0
Current	34,103	39,140
Loans	34,103	39,140
Recorded Investment Greater Than 90 Days Accruing	0	0
Non-accrual	0	0
Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	164
60-89 Days Past Due	0	0
Greater Than 90 Days Past Due	247	249
Total Past Due	247	413
Current	175,509	176,391
Loans	175,756	176,804
Recorded Investment Greater Than 90 Days Accruing	0	0
Non-accrual	1,375	1,363
Real estate construction and other land loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	547
60-89 Days Past Due	0	0
Greater Than 90 Days Past Due	589	0
Total Past Due	589	547
Current	39,691	38,376
Loans	40,280	38,923
Recorded Investment Greater Than 90 Days Accruing	0	0
Non-accrual	589	547
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Greater Than 90 Days Past Due	0	0
Total Past Due	0	0
Current	108,086	106,788
Loans	108,086	106,788
Recorded Investment Greater Than 90 Days Accruing	0	0
Non-accrual	2,124	1,468
Agricultural real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Greater Than 90 Days Past Due	0	0
Total Past Due	0	0
Current	67,202	57,501
Loans	67,202	57,501
Recorded Investment Greater Than 90 Days Accruing	0	0
Non-accrual	360	360
Other real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Greater Than 90 Days Past Due	0	0
Total Past Due	0	0
Current	7,674	6,611
Loans	7,674	6,611
Recorded Investment Greater Than 90 Days Accruing	0	0
Non-accrual	0	0
Equity loans and lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,437	0
60-89 Days Past Due	0	0
Greater Than 90 Days Past Due	0	227
Total Past Due	1,437	227
Current	44,307	47,348
Loans	45,744	47,575
Recorded Investment Greater Than 90 Days Accruing	0	0
Non-accrual	2,808	3,030
Consumer and installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	15	30
60-89 Days Past Due	0	0
Greater Than 90 Days Past Due	0	0
Total Past Due	15	30
Current	7,634	10,063
Loans	7,649	10,093
Recorded Investment Greater Than 90 Days Accruing	0	0
Non-accrual	$ 18	$ 19

Financing receivables that are less than 60 days past due but more than 29 days past due.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7A

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524

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Financing receivables that are current.

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+ 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 210.9-03.10(3))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Subparagraph 3

-Article 9

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