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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net Income, Gross                 $ 232,692,000 $ 197,131,000 $ 142,267,000
Net Income, Tax                 66,831,000 55,304,000 35,849,000
Net income $ 45,389,000 $ 46,996,000 $ 33,768,000 $ 39,708,000 $ 41,350,000 $ 53,162,000 $ 29,341,000 $ 17,974,000 165,861,000 141,827,000 106,418,000
Unrealized holding (losses) gains during the period, Gross                 (40,221,000) 72,940,000 (83,934,000)
Unrealized holding (losses) gains during the period, Tax                 (14,078,000) 25,529,000 (29,377,000)
Unrealized holding (losses) gains arising during period                 (26,143,000) 47,411,000 (54,557,000)
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, Gross                     77,000
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, Tax                     27,000
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income                     50,000
Amount reclassified into net income: HTM securities, Gross                 (580,000) (1,299,000) (1,577,000)
Amortization Of Net Unrealized Gains Losses On Held-to-Maturity Transferred From Available-for-Sale Tax                 (203,000) (455,000) (552,000)
Amount reclassified from AOCI, HTM                 (377,000) (844,000) (1,025,000)
Non-credit OTTI, Gross                 357,000 1,669,000 14,000
Non-credit OTTI, Tax                 125,000 584,000 5,000
Amounts reclassified into net income: Non-credit other-than-temporary impairment                 232,000 1,085,000 9,000
Realized gains on AFS securities, Gross                 (14,016,000) (28,864,000) (23,540,000)
Realized gains on AFS securities, Tax                 (4,906,000) (10,102,000) (8,239,000)
Realized gains on available for sale securities                 (9,110,000) (18,762,000) (15,301,000)
Net unrealized (losses) gains, Gross                 (54,460,000) 44,446,000 (108,960,000)
Net unrealized (losses) gains, Tax                 (19,062,000) 15,556,000 (38,136,000)
Total unrealized (losses) gains on investment securities                 (35,398,000) 28,890,000 (70,824,000)
Net actuarial gain (loss), Gross                 2,438,000 (54,136,000) 59,654,000
Net actuarial gain (loss), Tax                 853,000 (18,947,000) 20,879,000
Net actuarial gain (loss)                 1,585,000 (35,189,000) 38,775,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax                 7,077,000 1,902,000 4,374,000
Amount reclassified into Net Income: Net actuarial loss, Tax                 2,477,000 666,000 1,531,000
Amount reclassified into net income: Net actuarial loss                 4,600,000 1,236,000 2,843,000
Amount reclassified into Net Income: Prior service cost, Gross                     10,000
Amount reclassified into Net Income: Prior service cost, Tax                     4,000
Amount reclassified into net income: Prior service cost                 0 0 6,000
Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Curtailment Expense Recognized In Net Periodic Benefit Cost Before Tax                     16,000
Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Curtailment Expense Recognized In Net Periodic Benefit Cost Tax                     5,000
Other Comprehensive Income Loss Amortization Pension And Other Post Retirement Benefit Plans Curtailment Expense Recognized In Net Periodic Benefit Cost Net of Tax                 0 0 11,000
Defined pension and other post-retirement benefit plans, Gross                 9,515,000 (52,234,000) 64,054,000
Defined pension and other post-retirement benefit plans, Tax                 3,330,000 (18,281,000) 22,419,000
Total defined benefit pension and post-retirement plans                 6,185,000 (33,953,000) 41,635,000
Other Comprehensive Loss, Gross                 (44,945,000) (7,788,000) (44,906,000)
Comprehensive Income, Tax                 51,099,000 52,579,000 20,132,000
Other Comprehensive Loss, Tax                 (15,732,000) (2,725,000) (15,717,000)
Other comprehensive loss (3,386,000) 6,290,000 (35,944,000) 3,827,000 (29,337,000) (18,887,000) 26,483,000 16,678,000 (29,213,000) (5,063,000) (29,189,000)
Comprehensive Income, Before Tax                 187,747,000 189,343,000 97,361,000
Comprehensive income $ 42,003,000 $ 53,286,000 $ (2,176,000) $ 43,535,000 $ 12,013,000 $ 34,275,000 $ 55,824,000 $ 34,652,000 136,648,000 136,764,000 77,229,000
Accumulated Other-than-Temporary Impairment [Member]                      
Other comprehensive loss                 232,000 1,085,000  
Accumulated Defined Benefit Plans Adjustment [Member]                      
Total defined benefit pension and post-retirement plans                 4,600,000 1,236,000  
Accumulated other comprehensive income (loss) [Member]                      
Other comprehensive loss                 $ (29,213,000) $ (5,063,000) $ (29,189,000)