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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net income, Gross $ 62,311 $ 46,765 $ 114,186 $ 103,055
Unrealized holding gains (losses) during the period, Gross 55,675 (60,244) 121,412 (36,267)
Non-credit portion of OTTI recognized in OCI, Gross (10)   (10)  
Amounts reclassified into net income: HTM securities, Gross (19) (185) (91) (446)
Amounts reclassified into net income: Non-credit OTTI, Gross       357
Realized (gains) losses on AFS securities, Gross (1,762) 3,422 937 (16,473)
Total unrealized gains (losses) on investment securities, Gross 53,884 (57,007) 122,248 (52,829)
Amount reclassified into net income: Net actuarial loss, Gross 1,517 1,709 3,033 3,418
Total defined pension and other post-retirement benefit plans, Gross 1,517 1,709 3,033 3,418
Other comprehensive income (loss), Gross 55,401 (55,298) 125,281 (49,411)
Comprehensive income (loss) before tax 117,712 (8,533) 239,467 53,644
Net income, Tax 18,710 12,997 33,553 29,579
Unrealized holding gains (losses) during the period, Tax 19,487 (21,084) 42,495 (12,693)
Non-credit portion of OTTI recognized in OCI, Tax (4)   (4)  
Amounts reclassified into net income: HTM securities, Tax (7) (65) (32) (156)
Amounts reclassified into net income: Non-credit OTTI, Tax       125
Realized (gains) losses on AFS securities, Tax (617) 1,197 328 (5,766)
Total unrealized gains (losses) on investment securities, Tax 18,859 (19,952) 42,787 (18,490)
Amount reclassified into net income: Net actuarial loss, Tax 532 598 1,062 1,196
Total defined pension and other post-retirement benefit plans, Tax 532 598 1,062 1,196
Other comprehensive income (loss), Tax 19,391 (19,354) 43,849 (17,294)
Comprehensive income (loss), Tax 38,101 (6,357) 77,402 12,285
Net income 43,601 33,768 80,633 73,476
Unrealized holding gains (losses) arising during period 36,188 (39,160) 78,917 (23,574)
Non-credit portion of OTTI recognized in OCI (6)   (6)  
Amounts reclassified into net income: HTM Securities (12) (120) (59) (290)
Amounts reclassified into net income: Non-credit OTTI 0 0 0 232
Realized (gains) losses on available-for-sale securities (1,145) 2,225 609 (10,707)
Total unrealized gains (losses) on investment securities 35,025 (37,055) 79,461 (34,339)
Amount reclassified into net income: Net actuarial loss 985 1,111 1,971 2,222
Total defined benefit pension and post-retirement plans 985 1,111 1,971 2,222
Other comprehensive income (loss) 36,010 (35,944) 81,432 (32,117)
Comprehensive income (loss) $ 79,611 $ (2,176) $ 162,065 $ 41,359