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Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Preferred Stock | Common Stock | Surplus | Retained Earnings | Other Comprehensive Income (Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2010 | $ 1,459,217 | $ 208,068 | $ 95,711 | $ 162,276 | $ 1,214,743 | $ 28,777 | $ (250,358)
Balance (in shares) at Dec. 31, 2010 |  |  | 95,711,000 |  |  |  |
Increase (decrease) in shareholders' equity |  |  |  |  |  |  |
Net Income | 127,149 |  |  |  | 127,149 |  |
Dividends: |  |  |  |  |  |  |
Cash ($.43, $.40 and $.38 per share for the year ended December 31, 2013, 2012 and 2011, respectively) | (25,648) |  |  |  | (25,648) |  |
Preferred stock (5%) including discount accretion | (10,800) | 2,480 |  |  | (13,280) |  |
Purchase of treasury stock (95,466 and 425,655 shares for the year ended December 31, 2012 and 2011, respectively) | (6,435) |  |  |  |  |  | (6,435)
Exercise of stock options | 113 |  | 9 | 104 |  |  |
Exercise of stock options (in shares) |  |  | 9,000 |  |  |  |
Stock compensation expense recognized in earnings | 387 |  |  | 387 |  |  |
Other comprehensive income (loss), net of tax: |  |  |  |  |  |  |
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments | 56,182 |  |  |  |  | 56,182 |
Balance at Dec. 31, 2011 | 1,600,165 | 210,548 | 95,720 | 162,767 | 1,302,964 | 84,959 | (256,793)
Balance (in shares) at Dec. 31, 2011 |  |  | 95,720,000 |  |  |  |
Increase (decrease) in shareholders' equity |  |  |  |  |  |  |
Net Income | 107,835 |  |  |  | 107,835 |  |
Dividends: |  |  |  |  |  |  |
Cash ($.43, $.40 and $.38 per share for the year ended December 31, 2013, 2012 and 2011, respectively) | (26,894) |  |  |  | (26,894) |  |
Preferred stock (5%) including discount accretion | (8,910) | 5,452 |  |  | (14,362) |  |
Redemption of Series A Preferred Shares (216,000 shares for the year ended December 31, 2012) | (216,000) | (216,000) |  |  |  |  |
Purchase of treasury stock (95,466 and 425,655 shares for the year ended December 31, 2012 and 2011, respectively) | (1,716) |  |  |  |  |  | (1,716)
Exercise of stock options | 51 |  | 5 | 46 |  |  |
Exercise of stock options (in shares) |  |  | 5,000 |  |  |  |
Stock compensation expense recognized in earnings | 474 |  |  | 474 |  |  |
Other comprehensive income (loss), net of tax: |  |  |  |  |  |  |
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments | (19,297) |  |  |  |  | (19,297) |
Balance at Dec. 31, 2012 | 1,435,708 |  | 95,725 | 163,287 | 1,369,543 | 65,662 | (258,509)
Balance (in shares) at Dec. 31, 2012 |  |  | 95,725,000 |  |  |  |
Increase (decrease) in shareholders' equity |  |  |  |  |  |  |
Net Income | 126,351 |  |  |  | 126,351 |  |
Dividends: |  |  |  |  |  |  |
Cash ($.43, $.40 and $.38 per share for the year ended December 31, 2013, 2012 and 2011, respectively) | (28,894) |  |  |  | (28,894) |  |
Exercise of stock options | 265 |  | 19 | 246 |  |  |
Exercise of stock options (in shares) |  |  | 19,000 |  |  |  |
Stock compensation expense recognized in earnings | 414 |  |  | 414 |  |  |
Other comprehensive income (loss), net of tax: |  |  |  |  |  |  |
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments | (109,436) |  |  |  |  | (109,436) |
Balance at Dec. 31, 2013 | $ 1,424,408 |  | $ 95,744 | $ 163,947 | $ 1,467,000 | $ (43,774) | $ (258,509)
Balance (in shares) at Dec. 31, 2013 |  |  | 95,744,000 |  |  |  |

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