Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
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- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

+ References

No definition available.

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- Definition

Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The number of derivative instruments of a particular group held by the entity.

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-Topic 815
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- Definition

Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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-SubTopic 30
-Section 50
-Paragraph 1
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- Definition

Amount of loan with fixed rate of interest.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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-Paragraph 2
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Loans Receivable Fixed Interest Rate

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Loans Receivable with Fixed Rates of Interest, Pool, Maturity Period

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- Definition

Underlying Derivative at Fair Value

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Derivative Instruments and Hedging Activities - Narrative (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) instrument	Dec. 31, 2014 USD ($)	Dec. 31, 2017 USD ($)
Derivative [Line Items]
Loans receivable with fixed rates of interest maturity period		10 years
Loans receivable with fixed rates		$ 29,100,000
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	$ 18,626,000		$ 19,224,000
Derivative Liabilities	0		12,000
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	132,567,000		132,593,000
Derivative Liabilities	$ 44,000		74,000
Interest Rate Swap [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Loans receivable with fixed rates of interest maturity period	15 years
Derivative fixed interest rate	7.43%
Notional Amount	$ 445,000		523,000
Loans receivable fixed interest rate (percentage)	7.43%
Credit Risk Contract [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	$ 84,709,000		75,622,000
Derivative number of instruments held \| instrument	16
Underlying derivative at fair value	$ 24,000
Cash Flow Hedging [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Derivative asset notional amount		$ 20,000,000
Derivative fixed interest rate		2.10%
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months	95,000
Cash Flow Hedging [Member] \| Interest Rate Swap [Member] \| Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	17,269,000		17,836,000
Cash Flow Hedging [Member] \| Interest Rate Swap [Member] \| Designated as Hedging Instrument [Member] \| Other Assets [Member]
Derivative [Line Items]
Derivative Liabilities	$ 485,000
Fair Value Hedging [Member] \| Interest Rate Swap [Member] \| Designated as Hedging Instrument [Member]
Derivative [Line Items]
Loans receivable with fixed rates of interest maturity period	10 years
Derivative fixed interest rate	5.83%
Notional Amount	$ 1,357,000		$ 1,388,000
Loans receivable fixed interest rate (percentage)	5.83%
Minimum [Member] \| Credit Risk Contract [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative remaining maturity	1 year
Maximum [Member] \| Credit Risk Contract [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative remaining maturity	10 years
One-Month LIBOR [Member] \| Interest Rate Swap [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative basis spread on variable rate	2.24%
One-Month LIBOR [Member] \| Fair Value Hedging [Member] \| Interest Rate Swap [Member] \| Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative basis spread on variable rate	3.50%