Financial Derivatives - Schedule of Credit Exposure to Interest Rate Swap Counterparties (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Liabilities derivatives interest rate swaps	$ 27,429	$ 19,633
Excluding Netting [Member] | Including Accrued Interest [Member]
Derivative [Line Items]
Assets derivatives interest rate swaps	51,760	51,267
Liabilities derivatives interest rate swaps	284,549	78,437
Counterparty Netting [Member] | Including Accrued Interest [Member]
Derivative [Line Items]
Assets derivatives interest rate swaps	47,291	48,124
Liabilities derivatives interest rate swaps	268,132	64,568
Netting [Member] | Including Accrued Interest [Member]
Derivative [Line Items]
Assets derivatives interest rate swaps	4,469	3,143
Liabilities derivatives interest rate swaps	$ 16,417	$ 13,869