Financial Derivatives - Schedule of Credit Exposure to Interest Rate Swap Counterparties (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Liabilities derivatives interest rate swaps	$ 22,203	$ 19,633
Excluding Netting [Member] | Including Accrued Interest [Member]
Derivative [Line Items]
Assets derivatives interest rate swaps	42,551	51,267
Liabilities derivatives interest rate swaps	139,843	78,437
Counterparty Netting [Member] | Including Accrued Interest [Member]
Derivative [Line Items]
Assets derivatives interest rate swaps	38,417	48,124
Liabilities derivatives interest rate swaps	133,793	64,568
Netting [Member] | Including Accrued Interest [Member]
Derivative [Line Items]
Assets derivatives interest rate swaps	4,134	3,143
Liabilities derivatives interest rate swaps	$ 6,050	$ 13,869