XML 86 R70.htm IDEA: XBRL DOCUMENT v3.8.0.1
Employee Benefit Plans - Summary of Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for stock options (in shares) 59,728      
Issuance of common stock (in shares) 114,935 23,163 18,314  
Weighted average number of net shares issued (redeemed)   34,965 36,296  
Forfeiture Of Shares Of Common Stock Shares (in shares) 3,934 1,264 1,042  
Number of Shares        
Options Outstanding Beginning Balance (in shares) 19,380 19,380 19,380  
Granted (in shares) 0 0 0  
Exercised (in shares) (9,160) 0 0  
Options Outstanding Ending Balance (in shares) 10,220 19,380 19,380 19,380
Weighted- Average Exercise Price        
Options Outstanding Weighted Average Exercise Price Beginning Balance (in dollars per share) $ 29.92 $ 29.92 $ 29.92  
Options Outstanding Weighted Average Exercise Price Ending Balance (in dollars per share) $ 33.44 $ 29.92 $ 29.92 $ 29.92
Weighted-Average Remaining Contractual Term (Years)        
Weighted-Average Remaining Contractual Term 4 years 5 months 12 days 3 years 11 days 4 years 11 days 5 years 11 days
Aggregate Intrinsic Value (In Thousands)        
Aggregate Intrinsic Value $ 342 $ 580 $ 580 $ 580
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for stock options (in shares) 59,728 83,201    
Issuance of common stock (in shares) 27,407      
Weighted average number of net shares issued (redeemed) 52,750      
Forfeiture Of Shares Of Common Stock Shares (in shares) 3,934      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value $ 39,660