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Derivatives (Narrative) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) item
Derivative [Line Items] |  |
Notional amount of derivatives | $ 3,024,565 | $ 2,799,296
Gross Amounts Recognized, Derivative Liabilities | 23,811 | 24,015
Derivatives Designated as Hedging Instruments [Member] |  |
Derivative [Line Items] |  |
Notional amount of derivatives | 1,358,110 | $ 1,358,110
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] |  |
Derivative [Line Items] |  |
Number of interest rate swap terminated | item |  | 2
Notional amount of derivatives | 875,000 | $ 875,000
Termination fees | 10,600 | 1,100
Amortization of accumulated other comprehensive loss on terminated cash flow hedges | 6,000 | 600
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 1, Expires 2022 [Member] |  |
Derivative [Line Items] |  |
Notional amount of derivatives | $ 425,000 |
Derivative maturity expiration year | 2022 |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 2, Expires 2023 [Member] |  |
Derivative [Line Items] |  |
Notional amount of derivatives | $ 350,000 |
Derivative maturity expiration year | 2023 |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 3, Expires 2024 [Member] |  |
Derivative [Line Items] |  |
Notional amount of derivatives | $ 100,000 |
Derivative maturity expiration year | 2024 |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement One To Five [Member] |  |
Derivative [Line Items] |  |
Number of interest rate swap agreements | item | 5 |
Number of interest rate swap terminated | item | 5 |
Notional amount of derivatives | $ 450,000 |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] |  |
Derivative [Line Items] |  |
Notional amount of derivatives | 483,110 | $ 483,110
Visa Class B Derivative Contract [Member] |  |
Derivative [Line Items] |  |
Gross Amounts Recognized, Derivative Liabilities | $ 7,300 |

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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 Fair value, before 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 elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 + Details
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