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Derivatives (Narrative) (Details)	9 Months Ended
	Sep. 30, 2017 USD ($) agreement
Derivative [Line Items]
Notional Amount	$ 59,700,000
Payable under agreements	722,000
Cash collateral	$ 756,000
Interest Rate Swap [Member]
Derivative [Line Items]
Number of interest rate swap agreements | agreement	11
Fair value adjustment on derivatives	$ 2,500,000

X

- Definition

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

+ References

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

Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage.

+ 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 210.9-03.1)
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Fair value, after the effects of master netting arrangements, of a financial asset or other 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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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

Amount of decrease in the fair value of derivatives recognized in the income statement.

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- Definition

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

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