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Income Taxes (Components of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
 [1]
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:                      
Federal                 $ 8,557 $ 4,250 $ 6,456
State                 1,043 1,638 941
Deferred:                      
Federal                 (3,404) 4,256 301
State                 (117) (259) 18
Total income tax expense $ 1,502 $ 1,481 $ 1,387 $ 1,709 $ 3,576 $ 2,396 $ 2,248 $ 1,665 $ 6,079 [2] $ 9,885 [1],[2] $ 7,716 [2]
[1] Includes one-time, non-cash TCJA charge of $1,824,000
[2] Presented on a tax-equivalent basis assuming a tax rate of 21% for 2018 and 35% for 2017 and 2016. The tax-equivalent adjustment was approximately $2,422,000 for 2018, $5,691,000 for 2017, and $5,550,000 for 2016.