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Derivative Financial Instruments Summary of Mortgage Loans Held For Sale (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]      
Loans held for sale $ 40,645   $ 37,828
Mortgage Loans Held For Sale [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 733 $ 21  
Cost [Member] | Mortgage Loans Held For Sale [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Loans held for sale 39,480   37,396
Fair value [Member] | Mortgage Loans Held For Sale [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Loans held for sale $ 40,645   $ 37,828