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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Trading |  |  |  |  |  |  |  |  |  |  |
Total | $ (940) | $ 1,661 | $ (3,609) | $ (5,378) | $ (4,114) | $ 1,368 | $ 2,142 | $ (354) |  |  |
Interest Rate Swaps |  |  |  |  |  |  |  |  |  |  |
Trading |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  | $ (11,167) | $ 9,188 | $ 13,765
Interest Rate Swaps | Designated as Hedging Instrument | Fair Value |  |  |  |  |  |  |  |  |  |  |
Fair Value Hedges |  |  |  |  |  |  |  |  |  |  |
Hedge ineffectiveness (losses) gains recorded in earnings |  |  |  |  |  |  |  |  | (4,557) | (1,035) | 2,695
Realized gains recorded in interest expense |  |  |  |  |  |  |  |  | 8,286 | 27,810 | 29,940
Trading |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  | 3,729 | 26,775 | 32,635
Interest Rate Swaps | Designated as Hedging Instrument | Cash Flow |  |  |  |  |  |  |  |  |  |  |
Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |
Hedge ineffectiveness losses recorded in earnings |  |  |  |  |  |  |  |  | 53 | (1,579) | (1,427)
Realized losses recorded in interest expense |  |  |  |  |  |  |  |  | (11,187) | (17,665) | (21,475)
Trading |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  | (11,134) | (19,244) | (22,902)
Interest Rate Swaps | Trading |  |  |  |  |  |  |  |  |  |  |
Trading |  |  |  |  |  |  |  |  |  |  |
Interest reclassification |  |  |  |  |  |  |  |  | (69) | 2,170 | 3,451
Realized gains (losses) recorded in earnings |  |  |  |  |  |  |  |  | (3,693) | (513) | 581
Total |  |  |  |  |  |  |  |  | $ (3,762) | $ 1,657 | $ 4,032

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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 Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net, Interest Reclassification + References No definition available. + 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=84234895&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=84234895&loc=SL5624171-113959 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=84234895&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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness. + 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)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Amount of gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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