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Derivatives and Hedging Activities (Narrative) (Details)	9 Months Ended
	Sep. 30, 2017 USD ($) instrument	Dec. 31, 2016 USD ($) instrument
Derivative [Line Items]
Derivative instruments in accumulated other comprehensive income reclassified to interest expense	$ 52,400
Derivative liability, notional amount	60,000,000
Derivative liabilities	2,500,000
Collateral against obligations	$ 3,100,000
Derivatives Not Designated as a Hedging Instruments [Member] | Interest rate products [Member]
Derivative [Line Items]
Number of derivative instruments held (in instrument) | instrument	46	36
Derivative notional amount	$ 698,500,000	$ 582,200,000
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Number of outstanding derivatives | instrument	2

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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Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

+ References

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-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

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The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

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Fair value, after the effects of master netting arrangements, of a 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. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

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

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