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Derivative Instruments and Hedging Activities - Interest Rate Swaps Included in Interest Income or Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Interest income-investment securities	$ 68,518	$ 43,909	$ 33,696
Interest expense-investment securities	$ 44,050	25,344	17,764
Designated as Hedging Instrument | Interest rate swaps
Derivative [Line Items]
Interest income-investment securities		267	0
Interest expense-investment securities		$ 0	$ 743

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- Definition

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Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities.

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Amount of interest expense classified as other.

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