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Derivative Financial Instruments - Schedule of Interest Rate Swaps, Unsecured Debt Hedges (Details) - Junior Subordinated Debt [Member] - Maturity 2036 [Member] - Interest Rate Swap [Member] - Unsecured Debt Hedges [Member] - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Derivative [Line Items]    
Notional amount $ 25,000 $ 25,000
Weighted average fixed rate paid by the Company 4.28% 4.28%