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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