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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Statement of Comprehensive Income [Abstract]        
Net Income $ 34,251 $ 38,566 $ 110,967 $ 119,945
Other Comprehensive Income (Loss), net of tax:        
Unrealized gain (loss) on securities 7,857 (3,011) 5,841 23,912
Reclassification adjustment for postretirement amendment gains included in net income 0 0 0 (944)
Reclassification adjustment for securities gains included in net income (1,124) (52) (5,388) (775)
Reclassification adjustment for loss on derivative financial instruments included in net income 2,456 0 2,456 0
Non-credit related unrealized gain on other-than-temporarily impaired debt securities 0 138 125 650
Amortization of unrealized loss on derivative financial instruments 3 34 71 102
Unrecognized postretirement income arising due to plan amendment 0 0 0 2,144
Amortization of net unrecognized pension and postretirement items 466 104 1,398 304
Other Comprehensive Income (Loss) 9,658 (2,787) 4,503 25,393
Total Comprehensive Income $ 43,909 $ 35,779 $ 115,470 $ 145,338