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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]          
Loans Held-for-sale, Mortgages $ 27,525   $ 27,525   $ 31,530
Mortgage Loans Held For Sale [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) (334) $ (120) (207) $ 445  
Cost [Member] | Mortgage Loans Held For Sale [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Loans Held-for-sale, Mortgages 27,271   27,271   31,069
Fair value [Member] | Mortgage Loans Held For Sale [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Loans Held-for-sale, Mortgages $ 27,525   $ 27,525   $ 31,530