Loans and Allowance for Credit Losses - Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	$ 12,348	$ 7,494
Upaid Principal Balance, With no related allowance recorded	18,628	10,402
Recorded Investment, With an allowance recorded	6,478	5,863
Unpaid Principal Balance, With an allowance recorded	6,665	5,955
Related Allowance	612	1,007
Total Recorded Investment	18,826	13,357
Total Unpaid Principal Balance	25,293	16,357
Average Recorded Investment, With no related allowance recorded	6,413	7,278	8,806
Interest Income Recognized, With no related allowance recorded	26	0	0
Average Recorded Investment, With an allowance recorded	5,013	7,090	9,486
Interest Income Recognized, With an allowance recorded	322	573	601
Average Recorded Investment, Total	11,426	14,368	18,292
Interest Income Recognized, Total	348	573	601
Forgone interest on nonaccrual loans	716	661	693
Commercial
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	6,440	350
Upaid Principal Balance, With no related allowance recorded	11,713	385
Recorded Investment, With an allowance recorded	828	1,177
Unpaid Principal Balance, With an allowance recorded	835	1,222
Related Allowance	230	469
Average Recorded Investment, With no related allowance recorded	638	329	952
Interest Income Recognized, With no related allowance recorded	0	0	0
Average Recorded Investment, With an allowance recorded	423	1,309	1,581
Interest Income Recognized, With an allowance recorded	0	111	226
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	6,440	350
Upaid Principal Balance, With no related allowance recorded	9,991	385
Recorded Investment, With an allowance recorded	828	1,177
Unpaid Principal Balance, With an allowance recorded	835	1,222
Related Allowance	230	469
Average Recorded Investment, With no related allowance recorded	638	329	952
Interest Income Recognized, With no related allowance recorded	0	0	0
Average Recorded Investment, With an allowance recorded	423	1,309	1,581
Interest Income Recognized, With an allowance recorded	0	111	226
Agricultural land and production
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	0	0
Upaid Principal Balance, With no related allowance recorded	1,722	0
Recorded Investment, With an allowance recorded	0	0
Unpaid Principal Balance, With an allowance recorded	0	0
Related Allowance	0	0
Real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	3,889	5,111
Upaid Principal Balance, With no related allowance recorded	4,208	7,186
Recorded Investment, With an allowance recorded	4,623	4,429
Unpaid Principal Balance, With an allowance recorded	4,783	4,469
Related Allowance	162	465
Average Recorded Investment, With no related allowance recorded	3,941	4,942	6,287
Interest Income Recognized, With no related allowance recorded	26	0	0
Average Recorded Investment, With an allowance recorded	4,260	5,292	7,268
Interest Income Recognized, With an allowance recorded	322	462	375
Owner occupied
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	1,188	3,160
Upaid Principal Balance, With no related allowance recorded	1,255	4,159
Recorded Investment, With an allowance recorded	199	385
Unpaid Principal Balance, With an allowance recorded	219	425
Related Allowance	30	3
Average Recorded Investment, With no related allowance recorded	2,063	2,321	1,053
Interest Income Recognized, With no related allowance recorded	2	0	0
Average Recorded Investment, With an allowance recorded	264	997	633
Interest Income Recognized, With an allowance recorded	0	86	0
Real estate construction and other land loans
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	547	1,449
Upaid Principal Balance, With no related allowance recorded	799	2,136
Recorded Investment, With an allowance recorded	3,542	4,044
Unpaid Principal Balance, With an allowance recorded	3,542	4,044
Related Allowance	72	462
Average Recorded Investment, With no related allowance recorded	1,276	2,342	4,933
Interest Income Recognized, With no related allowance recorded	24	0	0
Average Recorded Investment, With an allowance recorded	3,782	4,295	6,490
Interest Income Recognized, With an allowance recorded	267	329	375
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	1,794	502
Upaid Principal Balance, With no related allowance recorded	1,794	891
Recorded Investment, With an allowance recorded	882	0
Unpaid Principal Balance, With an allowance recorded	1,022	0
Related Allowance	60	0
Average Recorded Investment, With no related allowance recorded	574	279	301
Interest Income Recognized, With no related allowance recorded	0	0	0
Average Recorded Investment, With an allowance recorded	214	0	145
Interest Income Recognized, With an allowance recorded	55	47	0
Agricultural real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	360	0
Upaid Principal Balance, With no related allowance recorded	360	0
Recorded Investment, With an allowance recorded	0	0
Unpaid Principal Balance, With an allowance recorded	0	0
Related Allowance	0	0
Average Recorded Investment, With no related allowance recorded	28	0	0
Interest Income Recognized, With no related allowance recorded	0	0	0
Other real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	0	0
Upaid Principal Balance, With no related allowance recorded	0	0
Recorded Investment, With an allowance recorded	0	0
Unpaid Principal Balance, With an allowance recorded	0	0
Related Allowance	0	0
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	2,019	2,033
Upaid Principal Balance, With no related allowance recorded	2,707	2,831
Recorded Investment, With an allowance recorded	1,027	257
Unpaid Principal Balance, With an allowance recorded	1,047	264
Related Allowance	220	73
Average Recorded Investment, With no related allowance recorded	1,834	2,007	1,567
Interest Income Recognized, With no related allowance recorded	0	0	0
Average Recorded Investment, With an allowance recorded	330	489	637
Interest Income Recognized, With an allowance recorded	0	0	0
Equity loans and lines of credit
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	2,019	2,029
Upaid Principal Balance, With no related allowance recorded	2,707	2,826
Recorded Investment, With an allowance recorded	1,008	257
Unpaid Principal Balance, With an allowance recorded	1,026	264
Related Allowance	217	73
Average Recorded Investment, With no related allowance recorded	1,826	1,998	1,561
Interest Income Recognized, With no related allowance recorded	0	0	0
Average Recorded Investment, With an allowance recorded	303	489	600
Interest Income Recognized, With an allowance recorded	0	0	0
Consumer and installment
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	0	4
Upaid Principal Balance, With no related allowance recorded	0	5
Recorded Investment, With an allowance recorded	19	0
Unpaid Principal Balance, With an allowance recorded	21	0
Related Allowance	3	0
Average Recorded Investment, With no related allowance recorded	8	9	6
Interest Income Recognized, With no related allowance recorded	0	0	0
Average Recorded Investment, With an allowance recorded	27	0	37
Interest Income Recognized, With an allowance recorded	$ 0	$ 0	$ 0

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5258-111524

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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953550-111524

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Amount of allowance for credit losses related to recorded investment.

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Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

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Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.

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Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

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Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554

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