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Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income [Member]
--- | --- | --- | --- | --- | ---
Balance, value at Dec. 31, 2010 | $ 255,032 | $ 9,662 | $ 23,443 | $ 219,568 | $ 2,359
Balance, shares at Dec. 31, 2010 |  | 18,551,540 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 20,878 | 0 | 0 | 20,878 | 0
Unrealized loss on investment, net of tax effect | (85) | 0 | 0 | 0 | (85)
Share-based compensation | 522 | 0 | 651 | (129) | 0
Exercise of stock options and similar instruments, value | (84) | 7 | (91) | 0 | 0
Exercise of stock options and similar instruments, shares |  | 13,896 |  |  |
Employee stock purchase plan, value | 525 | 14 | 511 | 0 | 0
Dividends | (12,823) | 0 | 0 | (12,823) | 0
Employee stock purchase plan, shares | 25,712 | 25,712 |  |  |
Dividend reinvestment and stock purchase plan, value | 39 | 1 | 38 | 0 | 0
Dividend reinvestment and stock purchase plan, shares |  | 1,679 |  |  |
Balance, value at Dec. 31, 2011 | 264,004 | 9,684 | 24,552 | 227,494 | 2,274
Balance, shares at Dec. 31, 2011 |  | 18,592,827 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 22,318 | 0 | 0 | 22,318 | 0
Unrealized loss on investment, net of tax effect | 36 | 0 | 0 | 0 | 36
Share-based compensation | 436 | 0 | 564 | (128) | 0
Exercise of stock options and similar instruments, value | 370 | 23 | 347 | 0 | 0
Exercise of stock options and similar instruments, shares |  | 44,784 |  |  |
Employee stock purchase plan, value | 588 | 15 | 573 | 0 | 0
Dividends | (13,231) | 0 | 0 | (13,231) | 0
Employee stock purchase plan, shares | 29,468 | 29,468 |  |  |
Dividend reinvestment and stock purchase plan, value | 83 | 2 | 81 | 0 | 0
Dividend reinvestment and stock purchase plan, shares |  | 3,487 |  |  |
Balance, value at Dec. 31, 2012 | 274,604 | 9,724 | 26,117 | 236,453 | 2,310
Balance, shares at Dec. 31, 2012 | 18,670,566 | 18,670,566 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 22,384 | 0 | 0 | 22,384 | 0
Unrealized loss on investment, net of tax effect | 1,077 | 0 | 0 | 0 | 1,077
Share-based compensation | 784 | 0 | 912 | (128) | 0
Exercise of stock options and similar instruments, value | 69 | 23 | 46 | 0 | 0
Exercise of stock options and similar instruments, shares |  | 43,665 |  |  |
Employee stock purchase plan, value | 722 | 16 | 706 | 0 | 0
Dividends | (14,443) | 0 | 0 | (14,443) | 0
Employee stock purchase plan, shares | 30,869 | 30,869 |  |  |
Dividend reinvestment and stock purchase plan, value | 84 | 2 | 82 | 0 | 0
Common stock issued, shares |  | 1,421,000 |  |  |
Common stock issued | 35,894 | 740 | 35,154 | 0 | 0
Dividend reinvestment and stock purchase plan, shares |  | 3,111 |  |  |
Balance, value at Dec. 31, 2013 | $ 321,175 | $ 10,505 | $ 63,017 | $ 244,266 | $ 3,387
Balance, shares at Dec. 31, 2013 | 20,169,211 | 20,169,211 |  |  |

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