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Derivative Financial Instruments Summary of Mortgage Loans Held For Sale (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]          
Loans Held-for-sale, Mortgages $ 45,754   $ 45,754   $ 27,099
Mortgage Loans Held For Sale [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) 304 $ 324 325 $ 127  
Cost [Member] | Mortgage Loans Held For Sale [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Loans Held-for-sale, Mortgages 44,737   44,737   26,407
Fair value [Member] | Mortgage Loans Held For Sale [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Loans Held-for-sale, Mortgages $ 45,754   $ 45,754   $ 27,099