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Income Taxes (Components of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current:                      
Federal                 $ 4,423 $ 8,557 $ 4,250
State                 1,392 1,043 1,638
Deferred:                      
Federal                 1,097 (3,404) 4,256
State                 150 (117) (259)
Total income tax expense $ 1,791 $ 1,787 $ 1,739 $ 1,745 $ 1,502 $ 1,481 $ 1,387 $ 1,709 $ 7,062 [1] $ 6,079 [1] $ 9,885 [1]
[1] Presented on a tax-equivalent basis assuming a tax rate of 21% for 2019 and 2018 and 35% for 2017. The tax-equivalent adjustment was approximately $2,084,000 for 2019, $2,422,000 for 2018, and $5,691,000 for 2017.