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Derivative Instruments and Hedging Activities - Interest Rate Swaps and Interest Rate Caps (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative [Line Items] |  |  |
Interest income-investment securities | $ 43,909 | $ 33,696 | $ 36,320
Interest expense-investment securities | 25,344 | 17,764 | 13,737
Designated as Hedging Instrument | Interest rate swaps |  |  |
Derivative [Line Items] |  |  |
Interest income-investment securities | 267 | 0 | 0
Interest expense-investment securities | $ 0 | $ 743 | $ 1,619

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- Definition Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities. + 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 210.9-04.2,3) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895926&loc=d3e24721-111560 + Details
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