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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