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Loans - Impaired Loans - Average Recorded Investment and Interest Income Recognized (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Average Recorded Investment
With no related allowance recorded	$ 19,105	$ 20,219
With an allowance recorded	926	317
Total impaired loans	20,031	20,536
Interest Income Recognized
With no related allowance recorded	61	78
Total impaired loans	61	78
Commercial
Average Recorded Investment
With no related allowance recorded	132	67
With an allowance recorded		238
Lease financing receivables
Average Recorded Investment
With no related allowance recorded	425
Real estate - commercial | Owner occupied general purpose
Average Recorded Investment
With no related allowance recorded	1,270	2,506
Interest Income Recognized
With no related allowance recorded		22
Real estate - commercial | Owner occupied special purpose
Average Recorded Investment
With no related allowance recorded	380	823
Real estate - commercial | Non-owner occupied general purpose
Average Recorded Investment
With no related allowance recorded	1,445	1,029
With an allowance recorded	123
Interest Income Recognized
With no related allowance recorded	1	1
Real estate - commercial | Non-owner occupied special purpose
Average Recorded Investment
With no related allowance recorded	506
Real estate - commercial | Retail properties
Average Recorded Investment
With no related allowance recorded	1,170
Real estate - commercial | Farm
Average Recorded Investment
With no related allowance recorded		636
Real estate - residential | Investor
Average Recorded Investment
With no related allowance recorded	1,744	1,889
Interest Income Recognized
With no related allowance recorded	12	12
Real estate - residential | Owner occupied
Average Recorded Investment
With no related allowance recorded	9,202	10,440
With an allowance recorded	803	56
Interest Income Recognized
With no related allowance recorded	39	41
Real estate - residential | Revolving and junior liens
Average Recorded Investment
With no related allowance recorded	2,447	2,747
With an allowance recorded		23
Interest Income Recognized
With no related allowance recorded	9	2
Consumer
Average Recorded Investment
With no related allowance recorded	106
Construction Loans | Real estate - commercial | Commercial speculative
Average Recorded Investment
With no related allowance recorded	72	$ 82
Construction Loans | Real estate - commercial | All other
Average Recorded Investment
With no related allowance recorded	$ 206

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
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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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 17
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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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
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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+ References

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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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-Publisher FASB
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-Topic 310
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-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524

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