Consolidated Statements of Stockholders' Equity (USD $)
Total
Common Stock [Member]
Additional Paid In Capital [Member]
Stock Subscription Receivable [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Balance at Dec. 31, 2010 $ 160,003,000 $ 129,000 $ 86,987,000 $ (2,000) $ (132,000) $ 73,021,000
Balance, Shares at Dec. 31, 2010   12,864,665        
Issuance of common stock 172,000 0 172,000 0 0 0
Issuance of common stock, shares   14,597        
Repurchase of common stock (6,449,000) (6,000) (6,443,000) 0 0 0
Repurchase of common stock, shares   (544,766)        
Exercise of stock options 1,234,000 2,000 1,232,000 0 0 0
Exercise of stock options, shares 169,611 169,611        
Excess tax benefits from stock-based payment arrangements 1,283,000 0 1,283,000 0 0 0
Stock option compensation recognized 96,000 0 96,000 0 0 0
Payment of receivables 0 0 0 0 0 0
Restricted stock grant 0 3,000 (3,000) 0 0 0
Restricted stock grant, shares   256,159        
Restricted stock compensation recognized 2,220,000 0 2,220,000 0 0 0
Net change related to derivatives, net of tax 97,000 0 0 0 97,000 0
Net change in unrealized gain/loss on securities available for sale, net of tax 36,000 0 0 0 36,000 0
Net income 6,175,000 0 0 0 0 6,175,000
Cash dividends paid (766,000)         (766,000)
Balance at Dec. 31, 2011 164,101,000 128,000 85,544,000 (2,000) 1,000 78,430,000
Balance, Shares at Dec. 31, 2011   12,760,266        
Issuance of common stock 136,000 0 136,000 0 0 0
Issuance of common stock, shares   8,788        
Repurchase of common stock (2,189,000) (2,000) (2,187,000) 0 0 0
Repurchase of common stock, shares   (145,315)        
Exercise of stock options 851,000 1,000 850,000 0 0 0
Exercise of stock options, shares 89,900 89,900        
Excess tax benefits from stock-based payment arrangements 592,000 0 592,000 0 0 0
Stock option compensation recognized 34,000 0 34,000 0 0 0
Restricted stock grant 0 1,000 (1,000) 0 0 0
Restricted stock grant, shares   61,190        
Restricted stock compensation recognized 2,526,000 0 2,526,000 0 0 0
Net change related to derivatives, net of tax 32,000 0 0 0 32,000 0
Net change in unrealized gain/loss on securities available for sale, net of tax 22,000 0 0 0 22,000 0
Net income 11,697,000 0 0 0 0 11,697,000
Cash dividends paid (3,552,000) 0 0 0 0 (3,552,000)
Balance at Dec. 31, 2012 174,250,000 128,000 87,494,000 (2,000) 55,000 86,575,000
Balance, Shares at Dec. 31, 2012 12,774,829 12,774,829        
Issuance of common stock 270,000 0 270,000 0 0 0
Issuance of common stock, shares   14,727        
Repurchase of common stock (1,168,000) (1,000) (1,167,000) 0 0 0
Repurchase of common stock, shares   (53,988)        
Exercise of stock options 1,524,000 1,000 1,523,000 0 0 0
Exercise of stock options, shares 127,957 127,957        
Excess tax benefits from stock-based payment arrangements 1,052,000 0 1,052,000 0 0 0
Stock option compensation recognized 188,000 0 188,000 0 0 0
Restricted stock grant 0 2,000 (2,000) 0 0 0
Restricted stock grant, shares   131,233        
Restricted stock compensation recognized 2,372,000 0 2,372,000 0 0 0
Net change related to derivatives, net of tax 0 0 0 0 0 0
Net change in unrealized gain/loss on securities available for sale, net of tax (312,000) 0 0 0 (312,000) 0
Net income 16,231,000 0 0 0 0 16,231,000
Cash dividends paid (31,369,000) 0 0 0 0 (31,369,000)
Balance at Dec. 31, 2013 $ 163,038,000 $ 130,000 $ 91,730,000 $ (2,000) $ (257,000) $ 71,437,000
Balance, Shares at Dec. 31, 2013 12,994,758 12,994,758