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Derivative Instruments and Hedging Activities - Interest Rate Swaps and Interest Rate Caps (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Interest income-investment securities | $ 9,716 | $ 8,587 | $ 29,716 | $ 25,612
Interest expense-investment securities | 5,759 | 4,598 | 17,132 | 12,409
Derivatives Designated as Hedging Instruments | Interest rate swaps |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Interest income-investment securities | 176 | 0 | 249 | 0
Interest expense-investment securities | $ 0 | $ 177 | $ 0 | $ 604

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