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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
Preferred Stock [Member]
Common Stock [Member]
Warrant [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balance (in shares) at Dec. 31, 2014 71,900 30,139,396          
Balance at Dec. 31, 2014 $ 71,900 $ 296 $ 946 $ 394,933 $ 150,037 $ 2,647 $ 620,759
Net Income 40,356 40,356
Net change in other comprehensive income, net of tax 499 499
Stock-based compensation 2,407 2,407
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares) 365,622          
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes $ 4 4,530 4,534
Tax benefits realized from stock compensation       1,867     1,867
Vesting of restricted stock awards issued at date of grant,net of shares withheld for payroll taxes (in shares) (16,345)          
Vesting of restricted stock awards issued at date of grant,net of shares withheld for payroll taxes $ 2 (2)
Restricted stock awards granted (in shares) 78,070          
Issuance of common stock related to employee stock purchase plan (in shares) 10,920          
Issuance of common stock related to employee stock purchase plan 368 368
Balance (in shares) at Jun. 30, 2015 71,900 33,394,563          
Balance at Jun. 30, 2015 $ 71,900 $ 330 946 498,704 190,035 3,146 765,061
Shares issued in public offering, net of issuance costs (in shares) 2,816,900          
Shares issued in public offering, net of issuance costs $ 28 94,605 94,633
Cash paid in lieu of fractional shares upon merger with Virginia Heritage (4) (4)
Preferred stock dividends (358) (358)
Balance (in shares) at Dec. 31, 2015 33,467,893          
Balance at Dec. 31, 2015 $ 331 946 503,529 233,604 191 738,601
Net Income 47,467 47,467
Net change in other comprehensive income, net of tax (1,515) (1,515)
Stock-based compensation 3,312 3,312
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares) 21,825          
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes 252 252
Tax benefits realized from stock compensation 140 140
Vesting of restricted stock awards issued at date of grant,net of shares withheld for payroll taxes (in shares) (17,485)          
Vesting of restricted stock awards issued at date of grant,net of shares withheld for payroll taxes $ 2 (2)
Restricted stock awards granted (in shares) 104,775          
Issuance of common stock related to employee stock purchase plan (in shares) 7,890          
Issuance of common stock related to employee stock purchase plan 371 371
Balance (in shares) at Jun. 30, 2016 33,584,898          
Balance at Jun. 30, 2016 $ 333 $ 946 $ 507,602 $ 281,071 $ (1,324) $ 788,628