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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]          
Loans held for sale $ 77,415   $ 77,415   $ 37,828
Mortgage Loans Held For Sale [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair Value, Option, Changes in Fair Value, Gain (Loss) 1,400 $ 304 2,100 $ 325  
Cost [Member] | Mortgage Loans Held For Sale [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Loans held for sale 74,868   74,868   37,396
Fair value [Member] | Mortgage Loans Held For Sale [Member]          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Loans held for sale $ 77,415   $ 77,415   $ 37,828