Loans and Allowance for Credit Losses - Loan Portfolio Aging (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 913	$ 1,642
60-89 Days Past Due	88	517
Greater Than 90 Days Past Due	476	670
Total Past Due	1,477	2,829
Current	570,965	509,687
Loans	572,442us-gaap_NotesReceivableGross	512,516us-gaap_NotesReceivableGross
Recorded Investment Greater Than 90 Days Accruing	0	0
Non-accrual	14,052	7,586
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	172	274
60-89 Days Past Due	88	236
Greater Than 90 Days Past Due	0	0
Total Past Due	260	510
Current	88,747	86,572
Loans	89,007	87,082
Recorded Investment Greater Than 90 Days Accruing	0	0
Non-accrual	7,265	1,527
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	39,140	31,649
Loans	39,140	31,649
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	164	1,272
60-89 Days Past Due	0	134
Greater Than 90 Days Past Due	249	418
Total Past Due	413	1,824
Current	176,391	154,957
Loans	176,804	156,781
Recorded Investment Greater Than 90 Days Accruing	0	0
Non-accrual	1,363	2,161
Real estate construction and other land loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	547	0
60-89 Days Past Due	0	0
Greater Than 90 Days Past Due	0	0
Total Past Due	547	0
Current	38,376	42,329
Loans	38,923	42,329
Recorded Investment Greater Than 90 Days Accruing	0	0
Non-accrual	547	1,450
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	106,788	86,117
Loans	106,788	86,117
Recorded Investment Greater Than 90 Days Accruing	0	0
Non-accrual	1,468	158
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	57,501	44,164
Loans	57,501	44,164
Recorded Investment Greater Than 90 Days Accruing	0	0
Non-accrual	360	0
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	6,611	4,548
Loans	6,611	4,548
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	0	10
60-89 Days Past Due	0	147
Greater Than 90 Days Past Due	227	252
Total Past Due	227	409
Current	47,348	48,185
Loans	47,575	48,594
Recorded Investment Greater Than 90 Days Accruing	0	0
Non-accrual	3,030	2,286
Consumer and installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	30	86
60-89 Days Past Due	0	0
Greater Than 90 Days Past Due	0	0
Total Past Due	30	86
Current	10,063	11,166
Loans	10,093	11,252
Recorded Investment Greater Than 90 Days Accruing	0	0
Non-accrual	$ 19	$ 4

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

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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

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Financing receivables that are current.

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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

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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

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

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