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Derivative Financial Instruments Summary of Mortgage Loans Held For Sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans Held-for-sale, Mortgages $ 27,836 $ 16,886
Cost | Mortgage Loans Held For Sale [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans Held-for-sale, Mortgages 27,030 16,584
Fair value | Mortgage Loans Held For Sale [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans Held-for-sale, Mortgages $ 27,836 $ 16,886