Loans and Allowance for Credit Losses - Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	$ 13,605		$ 12,348
Upaid Principal Balance, With no related allowance recorded	15,208		18,628
Recorded Investment, With an allowance recorded	4,573		6,478
Unpaid Principal Balance, With an allowance recorded	4,623		6,665
Related Allowance	284		612
Total Recorded Investment	18,178		18,826
Total Unpaid Principal Balance	19,831		25,293
Average Recorded Investment, With no related allowance recorded	12,572	7,394
Interest Income Recognized, With no related allowance recorded	60	20
Average Recorded Investment, With an allowance recorded	5,918	5,192
Interest Income Recognized, With an allowance recorded	19	70
Average Recorded Investment, Total	18,490	12,586
Interest Income Recognized, Total	79	90
Forgone interest on nonaccrual loans	259	164
Commercial
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded			6,440
Upaid Principal Balance, With no related allowance recorded			11,713
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	6,282		6,440
Upaid Principal Balance, With no related allowance recorded	6,696		9,991
Recorded Investment, With an allowance recorded	140		828
Unpaid Principal Balance, With an allowance recorded	141		835
Related Allowance	37		230
Average Recorded Investment, With no related allowance recorded	6,191	329
Interest Income Recognized, With no related allowance recorded	0	0
Average Recorded Investment, With an allowance recorded	668	872
Interest Income Recognized, With an allowance recorded	0	0
Agricultural land and production
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded			0
Upaid Principal Balance, With no related allowance recorded			1,722
Real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	4,732		3,889
Upaid Principal Balance, With no related allowance recorded	5,238		4,208
Recorded Investment, With an allowance recorded	4,198		4,623
Unpaid Principal Balance, With an allowance recorded	4,225		4,783
Related Allowance	188		162
Average Recorded Investment, With no related allowance recorded	4,066	5,118
Interest Income Recognized, With no related allowance recorded	60	20
Average Recorded Investment, With an allowance recorded	4,626	4,084
Interest Income Recognized, With an allowance recorded	19	70
Owner occupied
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	1,179		1,188
Upaid Principal Balance, With no related allowance recorded	1,253		1,255
Recorded Investment, With an allowance recorded	196		199
Unpaid Principal Balance, With an allowance recorded	219		219
Related Allowance	28		30
Average Recorded Investment, With no related allowance recorded	1,184	3,195
Interest Income Recognized, With no related allowance recorded	0	20
Average Recorded Investment, With an allowance recorded	198	96
Interest Income Recognized, With an allowance recorded	0	0
Real estate construction and other land loans
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	589		547
Upaid Principal Balance, With no related allowance recorded	842		799
Recorded Investment, With an allowance recorded	3,286		3,542
Unpaid Principal Balance, With an allowance recorded	3,286		3,542
Related Allowance	31		72
Average Recorded Investment, With no related allowance recorded	557	1,427
Interest Income Recognized, With no related allowance recorded	60	0
Average Recorded Investment, With an allowance recorded	3,436	3,988
Interest Income Recognized, With an allowance recorded	0	70
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	2,604		1,794
Upaid Principal Balance, With no related allowance recorded	2,783		1,794
Recorded Investment, With an allowance recorded	716		882
Unpaid Principal Balance, With an allowance recorded	720		1,022
Related Allowance	129		60
Average Recorded Investment, With no related allowance recorded	1,965	496
Interest Income Recognized, With no related allowance recorded	0	0
Average Recorded Investment, With an allowance recorded	992	0
Interest Income Recognized, With an allowance recorded	19	0
Agricultural real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	360		360
Upaid Principal Balance, With no related allowance recorded	360		360
Average Recorded Investment, With no related allowance recorded	360	0
Interest Income Recognized, With no related allowance recorded	0	0
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded			2,019
Upaid Principal Balance, With no related allowance recorded			2,707
Recorded Investment, With an allowance recorded	235		1,027
Unpaid Principal Balance, With an allowance recorded	257		1,047
Related Allowance	59		220
Average Recorded Investment, With no related allowance recorded	2,315	1,947
Interest Income Recognized, With no related allowance recorded	0	0
Average Recorded Investment, With an allowance recorded	624	236
Interest Income Recognized, With an allowance recorded	0	0
Equity loans and lines of credit
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded	2,591		2,019
Upaid Principal Balance, With no related allowance recorded	3,274		2,707
Recorded Investment, With an allowance recorded	217		1,008
Unpaid Principal Balance, With an allowance recorded	237		1,026
Related Allowance	57		217
Average Recorded Investment, With no related allowance recorded	2,315	1,943
Interest Income Recognized, With no related allowance recorded	0	0
Average Recorded Investment, With an allowance recorded	605	236
Interest Income Recognized, With an allowance recorded	0	0
Consumer and installment
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance recorded			0
Upaid Principal Balance, With no related allowance recorded			0
Recorded Investment, With an allowance recorded	18		19
Unpaid Principal Balance, With an allowance recorded	20		21
Related Allowance	2		3
Average Recorded Investment, With no related allowance recorded	0	4
Interest Income Recognized, With no related allowance recorded	0	0
Average Recorded Investment, With an allowance recorded	19	0
Interest Income Recognized, With an allowance recorded	$ 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 that are recognized as impaired, for which there is no related allowance for credit losses.

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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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