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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]          
Loans held for sale $ 93,621   $ 93,621   $ 37,828
Mortgage Loans Held For Sale [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) 658 $ 499 2,800 $ 174  
Cost [Member] | Mortgage Loans Held For Sale [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Loans held for sale 90,416   90,416   37,396
Fair value [Member] | Mortgage Loans Held For Sale [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Loans held for sale $ 93,621   $ 93,621   $ 37,828