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Derivatives (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Derivative [Line Items] |  |  |  |  |
Notional amount of derivatives | $ 2,740,984 |  | $ 2,740,984 |  | $ 2,342,791
Ineffective portion of change in derivative fair value | 0 | $ 0 | 0 | $ 0 |
Derivative income reflected in the income statement | 1,300 | 1,300 | 4,400 | 1,700 |
Impact to interest income from cash flow hedges | (100) | 700 | (200) | 1,700 |
Aggregate fair value of derivatives in a net liability position | 16,600 |  | 16,600 |  |
Deposits | 21,789 | $ 12,590 | 52,972 | $ 36,926 |
Derivatives Designated as Hedging Instruments [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of derivatives | 1,238,000 |  | 1,238,000 |  | 1,100,000
Interest Rate Swaps [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Deposits | 200 |  | 600 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of derivatives | 875,000 |  | 875,000 |  | $ 1,100,000
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date One [Member] | Swap Agreement 3, Expires 2019 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of derivatives | 250,000 |  | $ 250,000 |  |
Derivative maturity expiration year |  |  | 2019 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date Two [Member] | Swap Agreement 4, Expires 2020 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of derivatives | 200,000 |  | $ 200,000 |  |
Derivative maturity expiration year |  |  | 2020 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date Three [Member] | Swap Agreement 5, Expires 2022 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of derivatives | $ 425,000 |  | $ 425,000 |  |
Derivative maturity expiration year |  |  | 2022 |  |

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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 assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + 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 (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624258-113959 + 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=64837297&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 Aggregate amount of interest expense on all deposits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.6) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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