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Derivative Financial Instruments - Impact of Derivatives on Consolidated Statements of Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Trading |  |  |  |  |  |  |  |  |  |  |
Total | $ 6,238 | $ (4,949) | $ (5,268) | $ 3,892 | $ (940) | $ 1,661 | $ (3,609) | $ (5,378) |  |  |
Interest Rate Swaps |  |  |  |  |  |  |  |  |  |  |
Trading |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  | $ (14,340) | $ (10,554) | $ 8,597
Interest Rate Swaps | Designated as Hedging Instrument | Fair Value |  |  |  |  |  |  |  |  |  |  |
Fair Value Hedges |  |  |  |  |  |  |  |  |  |  |
Interest recognized on derivatives |  |  |  |  |  |  |  |  | (11,642) | 8,286 | 27,810
Hedged items recorded in interest expense |  |  |  |  |  |  |  |  | (7,966) | 16,155 | 14,447
Derivatives recorded in interest expense |  |  |  |  |  |  |  |  | 8,123 | (20,115) | (15,482)
Trading |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  | (11,485) | 4,326 | 26,775
Interest Rate Swaps | Designated as Hedging Instrument | Cash Flow |  |  |  |  |  |  |  |  |  |  |
Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income into interest expense |  |  |  |  |  |  |  |  | (1,455) | (11,187) | (17,665)
Trading |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  | (1,455) | (11,187) | (17,665)
Interest Rate Swaps | Trading |  |  |  |  |  |  |  |  |  |  |
Trading |  |  |  |  |  |  |  |  |  |  |
Change in fair value of future interest payments recorded in earnings |  |  |  |  |  |  |  |  | (1,400) | (3,693) | (513)
Total |  |  |  |  |  |  |  |  | $ (1,400) | $ (3,693) | $ (513)

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- Definition Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net, Hedge Ineffectiveness + References No definition available. + Details
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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 + 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- Definition The net gain (loss) relating to components of the gain (loss) on the cash flow hedging instrument excluded from the assessment of cash flow hedge effectiveness. Recognized in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Net gain (loss) relating to components of the gain (loss) on the fair value hedging instrument excluded from the assessment of fair value hedge effectiveness. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 + Details
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