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Derivatives - Outstanding hedges (Details) - Cash Flow Hedging - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Interest rate swaps \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative, notional amount	$ 450,000	$ 450,000
Interest rate swaps \| Designated as Hedging Instrument \| Other Assets
Derivative [Line Items]
Derivative asset, fair value, gross asset	0	0
Interest rate swaps \| Designated as Hedging Instrument \| Other Liabilities
Derivative [Line Items]
Derivative liability, fair value, gross liability	$ 17,436	6,875
Foreign currency contracts \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative, notional amount		25,592
Foreign currency contracts \| Designated as Hedging Instrument \| Other Assets
Derivative [Line Items]
Derivative asset, fair value, gross asset		20
Foreign currency contracts \| Designated as Hedging Instrument \| Other Liabilities
Derivative [Line Items]
Derivative liability, fair value, gross liability		0
Foreign currency contracts \| Not Designated as Hedging Instrument, Economic Hedge
Derivative [Line Items]
Derivative, notional amount		32,683
Foreign currency contracts \| Not Designated as Hedging Instrument, Economic Hedge \| Other Assets
Derivative [Line Items]
Derivative asset, fair value, gross asset		0
Foreign currency contracts \| Not Designated as Hedging Instrument, Economic Hedge \| Other Liabilities
Derivative [Line Items]
Derivative liability, fair value, gross liability		$ 198