Derivative Financial Instruments - Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Interest rate swaps, notional amount	$ 1,366,244	$ 885,469
Interest rate swaps, net carrying value	(75,136)	(17,301)
Designated as Hedging Instrument [Member]
Interest rate swaps, notional amount	321,100	326,000
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Interest rate swaps, notional amount	1,021,500	541,500
Not Designated as Hedging Instrument [Member]
Interest rate swaps, notional amount	23,700	23,700
Interest Rate Swaps 1 [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Interest rate swaps, notional amount		139,960
Interest rate swaps, net carrying value		2,352
Interest Rate Swaps 1 [Member] | Not Designated as Hedging Instrument [Member]
Interest rate swaps, notional amount	2,842
Interest rate swaps, net carrying value	57
Interest Rate Swaps 2 [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Interest rate swaps, notional amount	321,060	186,009
Interest rate swaps, net carrying value	(36,731)	(7,769)
Interest Rate Swap [Member]
Interest rate swaps, notional amount	326,700	326,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Interest rate swaps, notional amount	1,021,500	541,500
Interest rate swaps, net carrying value	(31,242)	(8,350)
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Interest rate swaps, notional amount	20,842	18,000
Interest rate swaps, net carrying value	$ (7,220)	$ (3,534)