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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Fair Value of Financial Instruments [Abstract]        
Unrealized gains (losses) on available-for-sale securities $ (95) $ 857 $ (371) $ 3,933
Unrealized gains (losses) on available-for-sale securities, net of tax $ (58) $ 509 $ (240) $ 2,402