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Derivatives (Narrative) (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 USD ($) agreement | Mar. 31, 2015 USD ($)
Derivative [Line Items] |  |
Ineffective portion of change in derivative fair value | $ 0 |
Derivative income reflected in income statement | (100) | $ (100)
Impact to interest income from cash flow hedges | 300 | $ 400
Aggregate fair value of derivatives in a net liability position | (31,900) |
Collateral obligations for derivative counterparties | $ 33,100 |
Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Number of interest rate swap agreements | agreement | 5 |
Interest Rate Swaps [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] | $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] | $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] | Date One [Member] | $100 Million Swap Agreement [Member] |  |
Derivative [Line Items] |  |
Swap agreement expiration date | Apr. 01, 2018 |
Interest Rate Swaps [Member] | Date Two [Member] | $100 Million Swap Agreement [Member] |  |
Derivative [Line Items] |  |
Swap agreement expiration date | Apr. 01, 2019 |
Interest Rate Swaps [Member] | Date Three [Member] | $100 Million Swap Agreement [Member] |  |
Derivative [Line Items] |  |
Swap agreement expiration date | Apr. 01, 2020 |

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- 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 + Details
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- Definition 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 -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959 + Details
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- Definition Fair value of credit risk derivative asset after deduction of credit risk derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5708775-113959 Reference 2: 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=49121117&loc=d3e13495-108611 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=49121117&loc=d3e13433-108611 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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