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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Net income, Gross $ 46,765 $ 39,521 $ 103,055 $ 64,605
Unrealized holding (losses) gains during the period, Gross (60,244) 45,122 (36,267) 78,086
Amounts reclassified into net income: HTM securities, Gross (185) (221) (446) (677)
Amounts reclassified into net income: non-credit OTTI   469 357 469
Realized losses (gains) on AFS securities, Gross 3,422 (5,008) (16,473) (12,237)
Net unrealized (losses) gains, Gross (57,007) 40,362 (52,829) 65,641
Amount reclassified into Net Income: Net actuarial loss, Gross 1,709 381 3,418 761
Defined pension and other post-retirement benefit plans, gross 1,709 381 3,418 761
Other comprehensive (loss) income, Gross (55,298) 40,743 (49,411) 66,402
Comprehensive (loss) income before tax (8,533) 80,264 53,644 131,007
Net income, Tax 12,997 10,180 29,579 17,290
Unrealized holding (losses) gains during the period, Tax (21,084) 15,793 (12,693) 27,331
HTM securities, Tax (65) (77) (156) (237)
Non-credit OTTI, Tax   164 125 164
Realized losses (gains) on AFS securities, Tax 1,197 (1,753) (5,766) (4,283)
Net unrealized (losses) gains, Tax (19,952) 14,127 (18,490) 22,975
Amount reclassified into Net Income: Net actuarial loss, Tax 598 133 1,196 266
Defined pension and other post-retirement benefit plans, tax 598 133 1,196 266
Other comprehensive (loss) income, Tax (19,354) 14,260 (17,294) 23,241
Comprehensive (loss) income tax (6,357) 24,440 12,285 40,531
Net income 33,768 29,341 73,476 47,315
Unrealized holding (losses) gains arising during period (39,160) 29,329 (23,574) 50,755
HTM Securities (120) (144) (290) (440)
Amounts reclassified into Net Income: Non-credit other-than-temporary impairments on disposed securities 0 305 232 305
Realized losses (gains) on available for sale securities 2,225 (3,255) (10,707) (7,954)
Total unrealized (losses) gains on investment securities (37,055) 26,235 (34,339) 42,666
Amount reclassified into net income: Net actuarial loss 1,111 248 2,222 495
Total defined benefit pension and post-retirement plans 1,111 248 2,222 495
Other comprehensive (loss) income (35,944) 26,483 (32,117) 43,161
Comprehensive (loss) income $ (2,176) $ 55,824 $ 41,359 $ 90,476