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Fair Value of Financial Instruments (Level 3 assets and liabilities measured at fair value) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Foreclosed real estate	$ 12,571	$ 9,532
Impaired Loans [Member]
Impaired loans	$ 14,086	$ 12,284
Valuation technique	Appraised value; PV of expected cash flows	Appraised value; PV of expected cash flows
Significant unobservable inputs	Discounts to reflect current market conditions, ultimate collectability, and estimated costs to sell	Discounts to reflect current market conditions, ultimate collectability, and estimated costs to sell
General range of significant input values, minimum	0.00%	0.00%
General range of significant input values, maximum	10.00%	10.00%
Foreclosed Real Estate [Member]
Foreclosed real estate	$ 12,571	$ 9,532
Valuation technique	Appraised value; List or contract price	Appraised value; List or contract price
Significant unobservable inputs	Discounts to reflect current market conditions and estimated costs to sell	Discounts to reflect current market conditions and estimated costs to sell
General range of significant input values, minimum	0.00%	0.00%
General range of significant input values, maximum	10.00%	10.00%

X

- Definition

The maximum general range of significant unobservable input values.

+ References

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- Definition

The minimum general range of significant unobservable input values.

+ References

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- Definition

Fair value of impaired loans covered by loss sharing arrangements.

+ References

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- Definition

Description of significant assumptions used by management to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

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- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(4))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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