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Fair Value of Financial Instruments - Quantative Information About Unobservable Inputs (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2016	Dec. 31, 2017
Derivative, fair value	$ (72)		$ (354)
Significant Unobservable Inputs (Level 3) | Minimum
IRLC - Loan closing rates	42.00%	39.00%
Significant Unobservable Inputs (Level 3) | Maximum
IRLC - Loan closing rates	100.00%	100.00%
IRLCs
Derivative, fair value	$ 383		551
IRLCs | Quoted Prices in Active Markets for Identical Assets (Level 1)
Derivative, fair value	0		0
IRLCs | Significant Other Observable Inputs (Level 2)
Derivative, fair value	0		0
IRLCs | Significant Unobservable Inputs (Level 3)
Derivative, fair value	383		551
IRLCs Fair Value	$ 383		$ 551
Other securities Valuation Technique	Discounted cash flow	Discounted cash flow
Other securities Unobservable Inputs	Loan closing rates	Loan closing rates

X

- Definition

Fair value portion of derivative financial instrument.

+ References

No definition available.

+ Details

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- Definition

It represents the IRLC on percentage range of fair value assets and Liabilities.

+ References

No definition available.

+ Details

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- Definition

It represents the other securities fair value assets and Liabilities unobservable inputs description.

+ References

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- Definition

It represents the other securities On fair value assets and Liabilities Valuation Technique.

+ References

No definition available.

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611

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