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Loans and Allowance - Impaired Financing Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Recorded Investment with specific reserves	$ 1,671	$ 1,750
Unpaid Principal Balance with specific reserves	1,699	1,779
Interest Income Recognized with specific reserves	5	66
Specific Reserve with specific reserves	782	530
Recorded Investment	1,740	1,845
Recorded Investment with no specific reserve	2,643	3,267
Unpaid Principal Balance with no specific reserve	3,411	4,159
Interest Income Recognized with no specific reserve	50	80
Average Recorded Investment with no specific reserve	3,528	4,131
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment with specific reserves	160	176
Unpaid Principal Balance with specific reserves	160	176
Interest Income Recognized with specific reserves	5
Specific Reserve with specific reserves	52	61
Recorded Investment	205	217
Recorded Investment with no specific reserve	88	193
Unpaid Principal Balance with no specific reserve	88	193
Residential real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment with specific reserves	1,294	1,345
Unpaid Principal Balance with specific reserves	1,322	1,374
Interest Income Recognized with specific reserves		58
Specific Reserve with specific reserves	513	240
Recorded Investment	1,312	1,393
Recorded Investment with no specific reserve	49	226
Unpaid Principal Balance with no specific reserve	49	226
Average Recorded Investment with no specific reserve		122
Commercial
Financing Receivable, Impaired [Line Items]
Recorded Investment with specific reserves	217	229
Unpaid Principal Balance with specific reserves	217	229
Interest Income Recognized with specific reserves		8
Specific Reserve with specific reserves	217	229
Recorded Investment	223	235
Recorded Investment with no specific reserve	992	1,267
Unpaid Principal Balance with no specific reserve	1,760	2,007
Interest Income Recognized with no specific reserve	11	10
Average Recorded Investment with no specific reserve	1,572	2,245
Commercial
Financing Receivable, Impaired [Line Items]
Recorded Investment with no specific reserve	1,194	1,579
Unpaid Principal Balance with no specific reserve	1,194	1,731
Interest Income Recognized with no specific reserve	39	70
Average Recorded Investment with no specific reserve	1,632	1,762
Home Equity Portfolio Segment
Financing Receivable, Impaired [Line Items]
Recorded Investment with no specific reserve	318
Unpaid Principal Balance with no specific reserve	318
Average Recorded Investment with no specific reserve	322
Installment
Financing Receivable, Impaired [Line Items]
Recorded Investment with no specific reserve	2	2
Unpaid Principal Balance with no specific reserve	2	2
Average Recorded Investment with no specific reserve	$ 2	$ 2

X

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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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=84173941&loc=d3e5258-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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- Definition

Amount of interest income, recognized on cash basis, on financing receivables, for which there is no related allowance for credit losses and are recognized as 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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-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

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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 (a)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&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)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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+ References

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-Publisher FASB
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+ References

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-Section 50
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+ References

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-Topic 310
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