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Fair Value of Financial Instruments (Unrealized gain (loss) on available-for-sale securities in OCI) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Fair Value of Financial Instruments [Abstract]        
Unrealized gains (losses) on available-for-sale securities $ 272 $ (882) $ (99) $ 3,051
Unrealized gains (losses) on available-for-sale securities, net of tax $ 168 $ (536) $ (72) $ 1,866