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Accumulated Other Comprehensive Income (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (loss), beginning of period $ (47,000)  
Other comprehensive loss, net of tax (54,000) $ (1,000)
Accumulated other comprehensive income (loss), end of period (101,000)  
Amount reclassified from accumulated other comprehensive income 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 [1] (47,000) 2,000
Other comprehensive gain (loss) before reclassifications [1],[2] (54,000) (1,000)
Other comprehensive loss, net of tax [1] (54,000) (1,000)
Accumulated other comprehensive income (loss), end of period [1] $ (101,000) $ 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 months ended March 31, 2018 and 2017.