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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Net income, Gross | $ 39,521 | $ 36,201 | $ 64,605 | $ 63,534
Unrealized holding gains during the period, Gross | 45,122 | (91,314) | 78,086 | (87,630)
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, Gross |  | 47 |  | 77
HTM securties, Gross | (221) | (614) | (677) | (1,331)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 469 | 6 | 469 | 13
Realized gains on AFS securities, Gross | (5,008) | (5,288) | (12,237) | (11,264)
Net unrealized gains (losses), Gross | 40,362 | (97,163) | 65,641 | (100,135)
Net actuarial gain, Gross |  |  |  | 44,000
Amount reclassified into Net Income: Net actuarial loss, Gross | 381 | 789 | 761 | 2,629
Amount reclassified into Net Income: Prior service cost, Gross |  |  |  | 10
Amount Reclassified Into Net Income: Curtailment Expense Before Tax |  |  |  | 16
Defined pension and other post-retirement benefit plans, gross | 381 | 789 | 761 | 46,655
Other comprehensive income (loss), Gross | 40,743 | (96,374) | 66,402 | (53,480)
Comprehensive income (loss), Gross | 80,264 | (60,173) | 131,007 | 10,054
Net income, Tax | 10,180 | 9,079 | 17,290 | 15,104
Unrealized holding gains (losses) during the period, Tax | 15,793 | (31,961) | 27,331 | (30,671)
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, Tax |  | 16 |  | 27
HTM securities, Tax | (77) | (215) | (237) | (466)
Non-credit OTTI, Tax | 164 | 3 | 164 | 5
Realized gains on AFS securities, Tax | (1,753) | (1,850) | (4,283) | (3,942)
Net unrealized gains (losses), Tax | 14,127 | (34,007) | 22,975 | (35,047)
Net actuarial gain, Tax |  |  |  | 15,400
Amount reclassified into Net Income: Net actuarial loss, Tax | 133 | 276 | 266 | 920
Amount reclassified into Net Income: Prior service cost, Tax |  |  |  | 4
Amount reclassified into Net Income: Curtailment expense, tax |  |  |  | 5
Defined pension and other post-retirement benefit plans, tax | 133 | 276 | 266 | 16,329
Other comprehensive income (loss), Tax | 14,260 | (33,731) | 23,241 | (18,718)
Comprehensive income (loss), Tax | 24,440 | (24,652) | 40,531 | (3,614)
Net income | 29,341 | 27,122 | 47,315 | 48,430
Unrealized holding gains (losses) arising during period | 29,329 | (59,353) | 50,755 | (56,959)
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income | 0 | 31 | 0 | 50
HTM Securities | (144) | (399) | (440) | (865)
Amounts reclassified into Net Income: Non-credit other-than-temporary impairments | 305 | 3 | 305 | 8
Realized gains on available for sale securities | (3,255) | (3,438) | (7,954) | (7,322)
Total unrealized gains (losses) on investment securities | 26,235 | (63,156) | 42,666 | (65,088)
Net actuarial gain | 0 | 0 | 0 | 28,600
Amount reclassified into Net Income: Net actuarial loss | 248 | 513 | 495 | 1,709
Amount reclassified into Net Income: Prior service cost | 0 | 0 | 0 | 6
Amount reclassified into Net Income: Curtailment expense | 0 | 0 | 0 | 11
Total defined benefit pension and post-retirement plans | 248 | 513 | 495 | 30,326
Other comprehensive income (loss) | 26,483 | (62,643) | 43,161 | (34,762)
Comprehensive income (loss) | $ 55,824 | $ (35,521) | $ 90,476 | $ 13,668

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