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Summary of Significant Accounting Policies - AOCL (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance     $ (1,416)  
Increase $ (609) $ 36 1,750 $ 36
Balance 334   334  
Unrealized (loss) gain on available-for-sale securities, net of tax        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance     (1,416)  
Increase     1,941  
Reclassification Adjustment     (191)  
Balance 334   334  
Accumulated other comprehensive (loss) income, net of tax        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance     (1,416)  
Increase     1,941  
Reclassification Adjustment     (191)  
Balance $ 334   $ 334