Financial Derivatives - Schedule of Credit Exposure to Interest Rate Swap Counterparties (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Liabilities derivatives interest rate swaps	$ 30,542	$ 19,633
Excluding Netting [Member] | Including Accrued Interest [Member]
Derivative [Line Items]
Assets derivatives interest rate swaps	54,469	51,267
Liabilities derivatives interest rate swaps	421,166	78,437
Counterparty Netting [Member] | Including Accrued Interest [Member]
Derivative [Line Items]
Assets derivatives interest rate swaps	52,071	48,124
Liabilities derivatives interest rate swaps	399,955	64,568
Netting [Member] | Including Accrued Interest [Member]
Derivative [Line Items]
Assets derivatives interest rate swaps	2,398	3,143
Liabilities derivatives interest rate swaps	$ 21,211	$ 13,869