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Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, except Share data | Common Stock [Member] | Capital Surplus [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income [Member] | Total
--- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2008 | $ 15,281 | $ 67,975 | $ 315,858 | $ 14,677 |
Balance, shares at Dec. 31, 2008 | 15,281,141 |  |  |  |
Common stock issued | 28 | 460 |  |  |
Common stock issued, shares | 27,600 |  |  |  |
Tax effect of stock options |  | 252 |  |  |
Stock based compensation arrangements |  | 1,038 |  |  |
Net income |  |  | 32,609 |  | 32,609
Dividends on common stock ($1.04, $0.96 and $0.90 per share, respectively) |  |  | (13,774) |  |
Net change |  |  |  | (3,654) | (3,654)
Balance at end of period at Dec. 31, 2009 | 15,309 | 69,725 | 334,693 | 11,023 | 430,750
Balance, shares at Dec. 31, 2009 | 15,308,741 |  |  |  |
Common stock issued | 76 | 1,581 |  |  |
Common stock issued, shares | 76,476 |  |  |  |
Tax effect of stock options |  | 516 |  |  |
Stock based compensation arrangements |  | 1,218 |  |  |
Net income |  |  | 42,309 |  | 42,309
Dividends on common stock ($1.04, $0.96 and $0.90 per share, respectively) |  |  | (14,733) |  |
Common stock acquired and canceled | (16) |  | (589) |  |
Shares acquired and canceled, shares | (16,500) |  |  |  |
Net change |  |  |  | (2,518) | (2,518)
Balance at end of period at Dec. 31, 2010 | 15,369 | 73,040 | 361,680 | 8,505 | 458,594
Balance, shares at Dec. 31, 2010 | 15,368,717 |  |  |  |
Common stock issued | 51 | 990 |  |  |
Common stock issued, shares | 50,862 |  |  |  |
Tax effect of stock options |  | 357 |  |  |
Stock based compensation arrangements |  | 3,075 |  |  |
Net income |  |  | 45,621 |  | 45,621
Dividends on common stock ($1.04, $0.96 and $0.90 per share, respectively) |  |  | (15,787) |  |
Common stock acquired and canceled | (302) |  | (10,497) |  |
Shares acquired and canceled, shares | (302,149) |  |  |  |
Net change |  |  |  | 939 | 939
Balance at end of period at Dec. 31, 2011 | $ 15,118 | $ 77,462 | $ 381,017 | $ 9,444 | $ 483,041
Balance, shares at Dec. 31, 2011 | 15,117,430 |  |  |  |

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