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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 $ 19,418 19,418
Net change in other comprehensive income, net of tax $ 633 633
Stock-based compensation $ 1,148 1,148
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares) 279,373          
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes $ 3 3,435 3,438
Tax benefits realized from stock compensation       1,450     $ 1,450
Vesting of restricted stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares) (15,039)          
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) 4,767          
Issuance of common stock related to employee stock purchase plan 154 $ 154
Balance (in shares) at Mar. 31, 2015 71,900 33,303,467          
Balance at Mar. 31, 2015 $ 71,900 $ 329 $ 946 495,784 $ 169,291 $ 3,280 741,530
Shares issued in public offering, net of issuance costs of $5,302 (in shares) 2,816,900          
Shares issued in public offering, net of issuance costs of $5,302 $ 28 94,670 94,698
Cash paid in lieu of fractional shares upon merger with Virginia Heritage $ (4) (4)
Preferred stock dividends $ (164) (164)
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 $ 23,322 23,322
Net change in other comprehensive income, net of tax $ (1,238) (1,238)
Stock-based compensation $ 1,430 1,430
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares) 15,915          
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes 159 159
Tax benefits realized from stock compensation 65 $ 65
Vesting of restricted stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares) (10,434)          
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) 3,450          
Issuance of common stock related to employee stock purchase plan 157 $ 157
Balance (in shares) at Mar. 31, 2016 33,581,599          
Balance at Mar. 31, 2016 $ 333 $ 946 $ 505,338 $ 256,926 $ (1,047) $ 762,496