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Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Preferred Shares | Common Shares | Retained Earnings | Treasury Stock | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2009 | $ 717,264 | $ 96,483 | $ 306,569 | $ 423,872 | $ (125,321) | $ 15,661
Beginning balance, shares at Dec. 31, 2009 |  | 100,000 | 14,882,780 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 58,101 |  |  | 58,101 |  |
Other comprehensive income (loss), net of tax: |  |  |  |  |  |
Changes in pension plan assets and benefit obligations recognized in other comprehensive income | (2,427) |  |  |  |  | (2,427)
Unrealized net holding gain (loss) on cash flow hedge, net of income taxes | (98) |  |  |  |  | (98)
Unrealized net holding gain (loss) on securities available-for-sale, net of income taxes | (15,004) |  |  |  |  | (15,004)
Cash dividends | (57,076) |  |  | (57,076) |  |
Fractional shares issued in dividend reinvestment plan, shares |  |  | (50) |  |  |
Cash payment for fractional shares in dividend reinvestment plan | (4) |  | (4) |  |  |
Reissuance of common stock from treasury shares held, shares |  |  | 509,184 |  |  |
Reissuance of common shares from treasury shares held | 33,327 |  | (898) | (12,729) | 46,954 |
Accretion of discount on preferred shares | 0 | 807 |  | (807) |  |
Common share warrants issued | 176 |  | 176 |  |  |
Common share warrants expired |  |  | (166) | 166 |  |
Preferred share dividends | (5,000) |  |  | (5,000) |  |
Treasury stock reissued for director grants, shares |  |  | 7,020 |  |  |
Treasury shares reissued for director grants | 449 |  |  | (185) | 634 |
Ending balance at Dec. 31, 2010 | 729,708 | 97,290 | 305,677 | 406,342 | (77,733) | (1,868)
Ending balance, shares at Dec. 31, 2010 |  | 100,000 | 15,398,934 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 82,140 |  |  | 82,140 |  |
Other comprehensive income (loss), net of tax: |  |  |  |  |  |
Changes in pension plan assets and benefit obligations recognized in other comprehensive income | (5,027) |  |  |  |  | (5,027)
Unrealized net holding gain (loss) on cash flow hedge, net of income taxes | 512 |  |  |  |  | 512
Unrealized net holding gain (loss) on securities available-for-sale, net of income taxes | (2,448) |  |  |  |  | (2,448)
Cash dividends | (57,907) |  |  | (57,907) |  |
Fractional shares issued in dividend reinvestment plan, shares |  |  | (42) |  |  |
Cash payment for fractional shares in dividend reinvestment plan | (2) |  | (2) |  |  |
Accretion of discount on preferred shares | 0 | 856 |  | (856) |  |
Common share warrants expired | 0 |  | (176) | 176 |  |
Preferred share dividends | (5,000) |  |  | (5,000) |  |
Treasury stock reissued for director grants, shares |  |  | 7,020 |  |  |
Treasury shares reissued for director grants | 388 |  |  | (338) | 726 |
Ending balance at Dec. 31, 2011 | 742,364 | 98,146 | 305,499 | 424,557 | (77,007) | (8,831)
Ending balance, shares at Dec. 31, 2011 |  | 100,000 | 15,405,912 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 78,630 |  |  | 78,630 |  |
Other comprehensive income (loss), net of tax: |  |  |  |  |  |
Changes in pension plan assets and benefit obligations recognized in other comprehensive income | (6,180) |  |  |  |  | (6,180)
Unrealized net holding gain (loss) on cash flow hedge, net of income taxes | 550 |  |  |  |  | 550
Unrealized net holding gain (loss) on securities available-for-sale, net of income taxes | (3,057) |  |  |  |  | (3,057)
Cash dividends | (57,932) |  |  | (57,932) |  |
Fractional shares issued in dividend reinvestment plan, shares |  |  | (34) |  |  |
Cash payment for fractional shares in dividend reinvestment plan | (2) |  | (2) |  |  |
Common share warrants redeemed | (2,843) |  | (2,843) |  |  |
Preferred shares redeemed | (100,000) | (100,000) |  |  |  |
Preferred shares redeemed, shares |  | (100,000) |  |  |  |
Accretion of discount on preferred shares | 0 | 1,854 |  | (1,854) |  |
Preferred share dividends | (1,571) |  |  | (1,571) |  |
Treasury stock reissued for director grants, shares |  |  | 6,120 |  |  |
Treasury shares reissued for director grants | 407 |  |  | (225) | 632 |
Ending balance at Dec. 31, 2012 | $ 650,366 | $ 0 | $ 302,654 | $ 441,605 | $ (76,375) | $ (17,518)
Ending balance, shares at Dec. 31, 2012 |  | 0 | 15,411,998 |  |  |

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