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Consolidated Statements of Stockholders' Equity (USD $) In Thousands | Common stock [Member] | Additional paid-in capital [Member] | Retained earnings [Member] | Accumulated other comprehensive income (loss) [Member] | Treasury stock [Member] | Comprehensive income [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Beginning of year at Dec. 31, 2008 | $ 190,527 | $ 217,195 | $ 1,128,149 | $ (100,666) | $ (544,712) |  |
Dividend reinvestment plan (shares: 100,383 - 2011; 106,437 - 2010; 123,880 - 2009) | 248 | 1,514 |  |  |  |  |
Stock purchase and compensation plans (shares: 783,661 - 2011; 433,271 - 2010; 435,571 - 2009) | 871 | 13,224 |  |  |  |  |
Cumulative effect adjustment due to adoption of other-than-temporary impairment guidance under ASC 320, net of deferred income tax |  |  | 2,380 | (2,380) |  |  | 2,380
Net income |  |  | 36,398 |  |  | 36,398 | 36,398
Dividends to stockholders ($0.52 per share - 2011, 2010, and 2009) |  |  | (27,949) |  |  |  |
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, net of deferred income tax |  |  |  | (5,629) |  |  | (5,629)
Other net unrealized gains on investment securities, net of deferred income tax |  |  |  | 92,183 |  |  |
Total unrealized gains on investment securities |  |  |  | 86,554 |  | 86,554 | 86,554
Defined benefit pension plans, net of deferred income tax |  |  |  | 4,032 |  | 4,032 | 4,032
Comprehensive income |  |  |  |  |  | 126,984 | 126,984
Acquisition of treasury stock (shares: 149,997 - 2011; 107,425 - 2010; 191,858 - 2009) |  |  |  |  | (3,010) |  | (3,010)
End of period at Dec. 31, 2009 | 191,646 | 231,933 | 1,138,978 | (12,460) | (547,722) | (12,460) | 1,002,375
Dividend reinvestment plan (shares: 100,383 - 2011; 106,437 - 2010; 123,880 - 2009) | 213 | 1,465 |  |  |  |  |
Stock purchase and compensation plans (shares: 783,661 - 2011; 433,271 - 2010; 435,571 - 2009) | 866 | 11,215 |  |  |  |  |
Cumulative effect adjustment due to adoption of other-than-temporary impairment guidance under ASC 320, net of deferred income tax |  |  | 0 | 0 |  |  | 0
Net income |  |  | 65,541 |  |  | 65,541 | 65,541
Dividends to stockholders ($0.52 per share - 2011, 2010, and 2009) |  |  | (28,364) |  |  |  |
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, net of deferred income tax |  |  |  | 3,416 |  |  | 3,416
Other net unrealized gains on investment securities, net of deferred income tax |  |  |  | 21,113 |  |  |
Total unrealized gains on investment securities |  |  |  | 24,529 |  | 24,529 | 24,529
Defined benefit pension plans, net of deferred income tax |  |  |  | (5,045) |  | (5,045) | (5,045)
Comprehensive income |  |  |  |  |  | 85,025 | 85,025
Acquisition of treasury stock (shares: 149,997 - 2011; 107,425 - 2010; 191,858 - 2009) |  |  |  |  | (1,686) |  | (1,686)
End of period at Dec. 31, 2010 | 192,725 | 244,613 | 1,176,155 | 7,024 | (549,408) |  | 1,071,109
Dividend reinvestment plan (shares: 100,383 - 2011; 106,437 - 2010; 123,880 - 2009) | 201 | 1,417 |  |  |  |  |
Stock purchase and compensation plans (shares: 783,661 - 2011; 433,271 - 2010; 435,571 - 2009) | 1,568 | 11,340 |  |  |  |  |
Cumulative effect adjustment due to adoption of other-than-temporary impairment guidance under ASC 320, net of deferred income tax |  |  | 0 | 0 |  |  | 0
Net income |  |  | 19,865 |  |  | 19,865 | 19,865
Dividends to stockholders ($0.52 per share - 2011, 2010, and 2009) |  |  | (28,801) |  |  |  |
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, net of deferred income tax |  |  |  | 1,093 |  |  | 1,093
Other net unrealized gains on investment securities, net of deferred income tax |  |  |  | 42,287 |  |  |
Total unrealized gains on investment securities |  |  |  | 43,380 |  | 43,380 | 43,380
Defined benefit pension plans, net of deferred income tax |  |  |  | (8,110) |  | (8,110) | (8,110)
Comprehensive income |  |  |  |  |  | 55,135 | 55,135
Acquisition of treasury stock (shares: 149,997 - 2011; 107,425 - 2010; 191,858 - 2009) |  |  |  |  | (2,741) |  | (2,741)
End of period at Dec. 31, 2011 | $ 194,494 | $ 257,370 | $ 1,167,219 | $ 42,294 | $ (552,149) |  | $ 1,109,228

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