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Loans - Impaired Loans - Average Recorded Investment and Interest Income Recognized (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Average Recorded Investment
With no related allowance recorded	$ 21,492	$ 29,891
With an allowance recorded	513	618
Total impaired loans	22,005	30,509
Interest Income Recognized
With no related allowance recorded	232	227
With an allowance recorded	31	2
Total impaired loans	263	229
Commercial
Average Recorded Investment
With no related allowance recorded	226	1,014
With an allowance recorded	2	2
Real estate - commercial | Owner occupied general purpose
Average Recorded Investment
With no related allowance recorded	2,412	4,857
Interest Income Recognized
With no related allowance recorded	66	62
Real estate - commercial | Owner occupied special purpose
Average Recorded Investment
With no related allowance recorded	580	1,288
Real estate - commercial | Non-owner occupied general purpose
Average Recorded Investment
With no related allowance recorded	1,655	2,583
With an allowance recorded	132	38
Interest Income Recognized
With no related allowance recorded	2
With an allowance recorded	31
Real estate - commercial | Non-owner occupied special purpose
Average Recorded Investment
With no related allowance recorded	506	712
Real estate - commercial | Retail properties
Average Recorded Investment
With no related allowance recorded	990
Real estate - commercial | Farm
Average Recorded Investment
With no related allowance recorded	636	636
Real estate - residential | Investor
Average Recorded Investment
With no related allowance recorded	1,864	2,050
With an allowance recorded		67
Interest Income Recognized
With no related allowance recorded	35	33
Real estate - residential | Owner occupied
Average Recorded Investment
With no related allowance recorded	9,916	11,309
With an allowance recorded	356	12
Interest Income Recognized
With no related allowance recorded	120	128
Real estate - residential | Revolving and junior liens
Average Recorded Investment
With no related allowance recorded	2,527	2,500
With an allowance recorded	23	364
Interest Income Recognized
With no related allowance recorded	9	4
With an allowance recorded		2
Consumer
Average Recorded Investment
With no related allowance recorded	100
Construction Loans | Real estate - commercial | Homebuilder
Average Recorded Investment
With no related allowance recorded		896
Construction Loans | Real estate - commercial | Commercial speculative
Average Recorded Investment
With no related allowance recorded	$ 80	1,780
Construction Loans | Real estate - commercial | All other
Average Recorded Investment
With no related allowance recorded		266
With an allowance recorded		$ 135

X

- Definition

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=66008989&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=66008989&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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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Amount of average investment of impaired financing receivables for which there is no 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 17
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524

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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 15
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-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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+ References

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-Publisher FASB
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-Topic 310
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-Section 50
-Paragraph 15
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-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524

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