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Derivative Financial Instruments Summary of Mortgage Loans Held For Sale (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Fair Value, Option, Quantitative Disclosures [Line Items]          
Loans Held-for-sale, Mortgages $ 23,049   $ 23,049   $ 28,697
Mortgage Loans Held For Sale [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) (120) $ (360) 445 $ 504  
Cost | Mortgage Loans Held For Sale [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Loans Held-for-sale, Mortgages 22,615   22,615   28,708
Fair value | Mortgage Loans Held For Sale [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Loans Held-for-sale, Mortgages $ 23,049   $ 23,049   $ 28,697