Stock-Based Compensation - Summary Of Information Regarding Stock Option Plans (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Outstanding, beginning of year (in shares) | shares	51,985
Number of Shares, Options granted (in shares) | shares	26,216
Number of Shares, Options expired (in shares) | shares	(8,629)
Number of Shares, Options exercised (in shares) | shares	(449)
Number of Shares, Outstanding, end of quarter (in shares) | shares	69,123
Number of Shares, Exercisable, end of quarter (in shares) | shares	8,581
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price per Share, Outstanding, beginning of year (usd per share)	$ 10.06
Weighted Average Exercise Price per Share, Options granted (usd per share)	12.83
Weighted Average Exercise Price per Share, Options expired (usd per share)	10.12
Weighted Average Exercise Price per Share, Options exercised (usd per share)	10.25
Weighted Average Exercise Price per Share, Outstanding, end of quarter (usd per share)	11.10
Weighted Average Exercise Price per Share, Exercisable, end of quarter (usd per share)	$ 10.04
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Contractual Term, Outstanding, end of quarter	8 years 7 months 6 days
Weighted Average Contractual Term, Exercisable, end of quarter	8 years 2 months 12 days
Aggregate Intrinsic Value, Outstanding, end of quarter | $	$ 361,591
Aggregate Intrinsic Value, Exercisable, end of quarter | $	$ 53,964
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Option price range at end of quarter (usd per share)	$ 9.97
Option price of exercisable shares (usd per share)	9.97
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Option price range at end of quarter (usd per share)	12.83
Option price of exercisable shares (usd per share)	$ 12.83