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Accumulated Other Comprehensive Income (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss), beginning of period     $ (47,000)  
Other comprehensive loss, net of tax $ (15,000) $ (2,000) (69,000) $ (3,000)
Accumulated other comprehensive loss, end of period (116,000)   (116,000)  
Amount reclassified from accumulated other comprehensive income 0 0 0 0
Unrealized Gains and Losses on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss), beginning of period (101,000) [1] 1,000 [1] (47,000) 2,000
Other comprehensive loss before reclassifications [2] (15,000) [1] (2,000) [1] (69,000) (3,000)
Other comprehensive loss, net of tax (15,000) [1] (2,000) [1] (69,000) (3,000)
Accumulated other comprehensive loss, end of period [1] $ (116,000) $ (1,000) $ (116,000) $ (1,000)
[1] All amounts are net of tax. Amounts in parentheses indicate a reduction of other comprehensive income.
[2] There were no amounts reclassified out of other comprehensive income for the three and six months ended June 30, 2018 and 2017.