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Fair Value Measurements (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value Disclosures [Abstract]      
Fair value measurement transfers from one level to another $ 0 $ 0 $ 0
Loans Held For Sale [Member] | Gain (Loss) on Sale of Loans [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) $ (155,000) $ 994,000 $ 0