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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The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 4H
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- Definition

Fair value of credit risk derivative asset after deduction of credit risk derivative liability.

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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-Paragraph 4C
-Subparagraph (d)
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-Paragraph 1
-Subparagraph (a)(1),(2)
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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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Date the derivative contract matures, in CCYY-MM-DD format.

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- Definition

The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

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Derivatives (Narrative) (Details) $ in Thousands	6 Months Ended
Derivatives (Narrative) (Details) $ in Thousands	Jun. 30, 2016 USD ($) agreement	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Derivative [Line Items]
Ineffective portion of change in derivative fair value	$ 0
Derivative income reflected in income statement	400	$ 1,400
Impact to interest income from cash flow hedges	1,000	$ 800
Aggregate fair value of derivatives in a net liability position	(40,700)
Collateral obligations for derivative counterparties	40,200
Derivatives Designated as Hedging Instruments [Member]
Derivative [Line Items]
Notional amount of derivatives	$ 800,000		$ 500,000
Interest Rate Swaps [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Cash Flow Hedge [Member]
Derivative [Line Items]
Number of interest rate swap agreements \| agreement	5
Notional amount of derivatives	$ 800,000		$ 500,000
Interest Rate Swaps [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Cash Flow Hedge [Member] \| $300 Million Swap Agreement [Member]
Derivative [Line Items]
Notional amount of derivatives	$ 300,000
Swap agreement expiration date	Jan. 01, 2017
Interest Rate Swaps [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Cash Flow Hedge [Member] \| $200 Million Swap Agreement [Member]
Derivative [Line Items]
Notional amount of derivatives	$ 200,000
Swap agreement expiration date	Jun. 01, 2017
Interest Rate Swaps [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Cash Flow Hedge [Member] \| $100 Million Swap Agreement [Member]
Derivative [Line Items]
Number of interest rate swap agreements \| agreement	3
Notional amount of derivatives	$ 100,000
Interest Rate Swaps [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Cash Flow Hedge [Member] \| Date One [Member] \| $100 Million Swap Agreement [Member]
Derivative [Line Items]
Swap agreement expiration date	Apr. 01, 2018
Interest Rate Swaps [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Cash Flow Hedge [Member] \| Date Two [Member] \| $100 Million Swap Agreement [Member]
Derivative [Line Items]
Swap agreement expiration date	Apr. 01, 2019
Interest Rate Swaps [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Cash Flow Hedge [Member] \| Date Three [Member] \| $100 Million Swap Agreement [Member]
Derivative [Line Items]
Swap agreement expiration date	Apr. 01, 2020