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Federal Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
 [1]
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
Federal Income Taxes [Abstract]                      
Current tax expense                 $ (164) $ 4,396 $ 2,134
Deferred tax expense (benefit)                 (1) (831) (832)
Income tax provision $ 506 $ 654 $ (1,816) $ 491 $ 1,048 $ 774 $ 950 $ 793 $ (165) $ 3,565 $ 1,302
[1] Includes $2.3 million for revaluation of the net deferred tax assets