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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table presents changes in accumulated other comprehensive income (loss) for unrealized gains and losses on available-for-sale securities (in thousands):
 
Year Ended
December 31,
 
2017
 
2016
Balance at beginning of period
$
(1,080
)
 
$
182

Other comprehensive income (loss) before reclassifications
795

 
(2,139
)
Less: amounts reclassified from accumulated other comprehensive income (loss)
78

 
(877
)
Net current period other comprehensive income (loss)
717

 
(1,262
)
Balance at end of period
$
(363
)
 
$
(1,080
)