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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands
Common stock [Member]
Additional paid-in capital [Member]
Retained earnings [Member]
Accumulated other comprehensive income (loss) [Member]
Treasury stock [Member]
Comprehensive income [Member]
Total
Beginning of year at Dec. 31, 2009$ 191,646$ 231,933$ 1,138,978$ (12,460)$ (547,722)  
Dividend reinvestment plan (shares: 74,777 - 2011; 81,471 - 2010)1631,098     
Stock purchase and compensation plans (shares: 607,059 - 2011; 284,793 - 2010)5698,441     
Net income  41,766  41,76641,766
Dividends to stockholders ($0.39 per share - 2011 and 2010)  (21,248)    
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, net of deferred income tax   3,026  3,026
Other net unrealized gains on investment securities, net of deferred income tax   55,556   
Total unrealized gains on investment securities   58,582 58,58258,582
Defined benefit pension plans, net of deferred income tax   2,098 2,0982,098
Comprehensive income     102,446102,446
Acquisition of treasury stock (shares: 137,667 - 2011; 98,419 - 2010)    (1,528)  
End of period at Sep. 30, 2010192,378241,4721,159,49648,220(549,250) 1,092,316
Beginning of year at Dec. 31, 2010192,725244,6131,176,1557,024(549,408) 1,071,109
Dividend reinvestment plan (shares: 74,777 - 2011; 81,471 - 2010)1501,066     
Stock purchase and compensation plans (shares: 607,059 - 2011; 284,793 - 2010)1,2148,260     
Net income  3,732  3,7323,732
Dividends to stockholders ($0.39 per share - 2011 and 2010)  (21,579)    
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, net of deferred income tax   336  336
Other net unrealized gains on investment securities, net of deferred income tax   22,617   
Total unrealized gains on investment securities   22,953 22,95322,953
Defined benefit pension plans, net of deferred income tax   2,187 2,1872,187
Comprehensive income     28,87228,872
Acquisition of treasury stock (shares: 137,667 - 2011; 98,419 - 2010)    (2,537)  
End of period at Sep. 30, 2011$ 194,089$ 253,939$ 1,158,308$ 32,164$ (551,945) $ 1,086,555