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Derivative Financial Instruments Fair Value Option (Details) - Mortgage loans held for sale - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Mortgage Banking Income    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value Loss $ (313) $ (140)
Mortgage loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Cost 28,708 16,584
Fair Value $ 28,697 $ 16,886