Derivatives and Hedging - Outstanding Derivatives (Details) - Back-to-back swaps - Not Designated as Hedging Instrument $ in Thousands	Sep. 30, 2020 USD ($) derivative	Dec. 31, 2019 USD ($) derivative
Derivative [Line Items]
Number of Instruments | derivative	60	56
Notional Amount | $	$ 545,559	$ 380,050