Share-Based Compensation (Details) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Share-Based Compensation [Abstract]
Options maximum term period	10 years	10 years
Shares [Roll Forward]
Options outstanding, beginning of period (in shares)	60,605
Granted (in shares)	0
Exercised (in shares)	(24,806)
Canceled or expired (in shares)	0
Options outstanding, end of period (in shares)	35,799
Options exercisable, end of period (in shares)	35,799
Weighted Average Exercise Price [Roll Forward]
Options outstanding, beginning of period (in dollars per share)	$ 20.05
Granted (in dollars per share)	0
Exercised (in dollars per share)	20.05
Canceled or expired (in dollars per share)	0
Options outstanding, end of period (in dollars per share)	20.05
Options exercisable, end of period (in dollars per share)	$ 20.05
Weighted Average Remaining Contractual Life (in years) [Abstract]
Options outstanding, end of period	3 months 14 days
Options exercisable, end of period	3 months 14 days
Aggregate Intrinsic Value [Abstract]
Options outstanding, end of period	$ 459,000
Options exercisable, end of period	459,000
Proceeds from exercise of stock options	497,000	$ 0
Unrecognized compensation expense related to nonvested options	$ 0	$ 0
Common Stock, Capital Shares Reserved for Future Issuance	247,314	0
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date	5.00%	0.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans	1,687	0