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Accumulated Other Comprehensive Income (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss), beginning of period     $ 2,000  
Other comprehensive income (loss), net of tax $ (3,000) $ (23,000) (6,000) $ 66,000
Accumulated other comprehensive income (loss), end of period (4,000)   (4,000)  
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 (1,000) [1] 80,000 [1] 2,000 (9,000)
Other comprehensive gain (loss) before reclassifications [2] (3,000) [1] (23,000) [1] (6,000) 66,000
Other comprehensive income (loss), net of tax (3,000) [1] (23,000) [1] (6,000) 66,000
Accumulated other comprehensive income (loss), end of period [1] $ (4,000) $ 57,000 $ (4,000) $ 57,000
[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 nine months ended September 30, 2017 and 2016.