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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Preferred Stock
Common [Member]
Warrant
Additional Paid in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total
Beginning balace at Dec. 31, 2014 $ 71,900 $ 296 $ 946 $ 394,933 $ 150,037 $ 2,647 $ 620,759
Beginning balace (in shares) at Dec. 31, 2014 71,900 30,139,396          
Net Income         84,167   84,167
Other comprehensive income (loss)           (2,456) (2,456)
Stock-based compensation expense       5,073     5,073
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes   $ 5   5,171     5,176
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares)   439,582          
Tax benefits realized from stock compensation       2,984     2,984
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes   $ 2   (2)      
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)   (26,701)          
Vesting of performance based stock awards, net of shares withheld for payroll taxes   (26,701)          
Time based stock awards granted (in shares)   78,070          
Issuance of common stock related to employee stock purchase plan       769     769
Issuance of common stock related to employee stock purchase plan (in shares)   20,646          
Redemption of Series B & C Preferred Stock $ (71,900)           (71,900)
Redemption of Series B & C Preferred Stock (in shares) (71,900)            
Preferred stock dividends         (600)   (600)
Shares issued in public offering, net of issuance costs   $ 28   94,605     94,633
Shares issued in public offering, net of issuance costs (in shares)   2,816,900          
Cash paid in lieu of fractional shares upon merger with Virginia Heritage       (4)     (4)
Ending balance at Dec. 31, 2015   $ 331 946 503,529 233,604 191 738,601
Ending balance (in shares) at Dec. 31, 2015   33,467,893          
Net Income         97,707   97,707
Other comprehensive income (loss)           (2,572) (2,572)
Stock-based compensation expense       6,907     6,907
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes   $ 1   954     955
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares)   74,215          
Tax benefits realized from stock compensation       400     400
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes   $ 2   (2)      
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)   (18,490)          
Vesting of performance based stock awards, net of shares withheld for payroll taxes   (18,490)          
Time based stock awards granted (in shares)   104,775          
Issuance of common stock related to employee stock purchase plan       801     801
Issuance of common stock related to employee stock purchase plan (in shares)   16,962          
Issuance of common stock in full redemption of warrants   $ 4 $ (946) 942      
Issuance of common stock in full redemption of warrants (in shares)   378,495          
Ending balance at Dec. 31, 2016   $ 338   513,531 331,311 (2,381) 842,799
Ending balance (in shares) at Dec. 31, 2016   34,023,850          
Net Income         100,232   100,232
Other comprehensive income (loss)           631 631
Stock-based compensation expense       5,568     5,568
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes   $ 1   371     372
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares)   69,040          
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes   $ 2   (2)      
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)   (17,801)          
Vesting of performance based stock awards, net of shares withheld for payroll taxes   (17,801)          
Vesting of performance based stock awards, net of shares withheld for payroll taxes (in shares)   4,293          
Time based stock awards granted (in shares)   91,097          
Issuance of common stock related to employee stock purchase plan   $ (1)   836 1   836
Issuance of common stock related to employee stock purchase plan (in shares)   14,684          
Ending balance at Dec. 31, 2017   $ 340   $ 520,304 $ 431,544 $ (1,750) $ 950,438
Ending balance (in shares) at Dec. 31, 2017   34,185,163