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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Other comprehensive income, before tax:          
Change in accumulated unrealized gain or loss for pension and other post retirement obligations $ 682 $ (18,157) $ 2,047 $ (17,808)  
Change in unrealized losses on derivative instruments used in cash flow hedging relationships 0 871 0 2,463  
Unrealized gains on securities, net:          
Unrealized holding gains, net arising during period 14,067 39,642 58,452 68,043  
Reclassification adjustment for (gains) losses included in net income (291) 6 (291) (99)  
Other comprehensive income, before tax: 14,458 22,362 60,208 52,599  
Income tax expense related to other comprehensive loss (5,488) (8,400) (23,237) (19,841)  
Other comprehensive income, net of tax: 8,970 13,962 36,971 32,758  
Net income 18,367 20,008 58,264 54,154  
Comprehensive income 27,337 33,970 95,235 86,912  
Tax Effect Allocated To Each Component Of Comprehensive Income:          
Tax effect of unrealized loss for pension and other postretirement obligations (264) 6,996 (794) 6,861  
Tax effect of unrealized losses on derivative instruments used in cash flow hedging relationships 0 (336) 0 (949)  
Tax effect of unrealized gains and losses on available-for-sale securities arising during period (5,224) (15,060) (22,443) (25,753)  
Income tax expense related to other comprehensive loss (5,488) (8,400) (23,237) (19,841)  
Accumulated Other Comprehensive Income By Component: [Abstract]          
Unrealized loss for pension and other postretirement obligations (38,430)   (38,430)   (40,477)
Tax effect 14,809   14,809   15,603
Net unrealized loss for pension and other postretirement obligations (23,621)   (23,621)   (24,874)
Unrealized gain, net on available-for-sale securities 143,673   143,673   85,512
Tax effect (53,916)   (53,916)   (31,473)
Net unrealized gain, net on available-for-sale securities 89,757   89,757   54,039
Accumulated other comprehensive income (loss) $ 66,136   $ 66,136   $ 29,165