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Fair Value Measurements, Quantitative Information (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available-for-sale debt securities	$ 250,025	$ 254,782
Impaired Loans [Member] | Appraised Collateral Values [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available-for-sale debt securities	$ 3,470	$ 1,569
Impaired Loans [Member] | Appraised Collateral Values [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Holding period	0 months	6 months
Impaired Loans [Member] | Appraised Collateral Values [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Holding period	12 months	12 months
Impaired Loans [Member] | Appraised Collateral Values [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Holding period	11 months 13 days	11 months
Impaired Loans [Member] | Appraised Collateral Values [Member] | Discount for Time Since Appraisal [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available-for-sale, Measurement input	0	0
Impaired Loans [Member] | Appraised Collateral Values [Member] | Discount for Time Since Appraisal [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available-for-sale, Measurement input	1	1
Impaired Loans [Member] | Appraised Collateral Values [Member] | Discount for Time Since Appraisal [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available-for-sale, Measurement input	0.2732	0.3083
Impaired Loans [Member] | Appraised Collateral Values [Member] | Selling Costs [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available-for-sale, Measurement input	0.05	0.05
Impaired Loans [Member] | Appraised Collateral Values [Member] | Selling Costs [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available-for-sale, Measurement input	0.11	0.09
Impaired Loans [Member] | Appraised Collateral Values [Member] | Selling Costs [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available-for-sale, Measurement input	0.0788	0.0835
Other Real Estate Owned [Member] | Appraised Collateral Values [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available-for-sale debt securities	$ 326	$ 1,024
Other Real Estate Owned [Member] | Appraised Collateral Values [Member] | Discount for Time Since Appraisal [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available-for-sale, Measurement input	0.25	0.15
Other Real Estate Owned [Member] | Appraised Collateral Values [Member] | Discount for Time Since Appraisal [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available-for-sale, Measurement input	0.35	0.65
Other Real Estate Owned [Member] | Appraised Collateral Values [Member] | Discount for Time Since Appraisal [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Available-for-sale, Measurement input	0.2745	0.2626

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- Definition

Holding period, used as an input to measure fair value.

+ References

No definition available.

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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- Definition

Value of input used to measure investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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