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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 61,819 61,819
Other comprehensive loss, net of tax (1,406) (1,406)
Stock-based compensation 3,660 3,660
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares) 373,027          
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes $ 4 4,636 4,640
Tax benefits realized from stock compensation       1,945     1,945
Vesting of restricted stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares) (17,877)          
Vesting of restricted stock awards issued at date of grant, net of shares withheld for payroll taxes $ 2 (2)
Restricted stock awards (in shares) 78,070          
Restricted stock awards
Issuance of common stock related to employee stock purchase plan (in shares) 15,994          
Issuance of common stock related to employee stock purchase plan 561 1 562
Balance (in shares) at Sep. 30, 2015 71,900 33,405,510          
Balance at Sep. 30, 2015 $ 71,900 $ 330 946 500,334 211,318 1,241 786,069
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 (539) (539)
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 71,990 71,990
Other comprehensive loss, net of tax (1,131) (1,131)
Stock-based compensation 5,159 5,159
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares) 23,614          
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes 282 282
Tax benefits realized from stock compensation 166 166
Vesting of restricted stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares) (17,556)          
Vesting of restricted stock awards issued at date of grant, net of shares withheld for payroll taxes $ 2 (2)
Restricted stock awards (in shares) 104,775          
Restricted stock awards
Issuance of common stock related to employee stock purchase plan (in shares) 12,154          
Issuance of common stock related to employee stock purchase plan 572 572
Balance (in shares) at Sep. 30, 2016 33,590,880          
Balance at Sep. 30, 2016 $ 333 $ 946 $ 509,706 $ 305,594 $ (940) $ 815,639