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Derivative Financial Instruments Summary of Mortgage Loans Held For Sale (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]      
Loans Held-for-sale, Mortgages $ 27,768   $ 27,099
Mortgage Loans Held For Sale [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 21 $ (197)  
Cost [Member] | Mortgage Loans Held For Sale [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Loans Held-for-sale, Mortgages 27,054   26,407
Fair value [Member] | Mortgage Loans Held For Sale [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Loans Held-for-sale, Mortgages $ 27,768   $ 27,099