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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Net income, Gross $ 58,929 $ 62,311 $ 126,503 $ 114,186
Unrealized holding gains during the period, Gross 35,887 55,675 61,672 121,412
Non Credit Portion Of Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income Gross 6 (10) 6 (10)
Amounts reclassified into net income: HTM securities, Gross (43) (19) (92) (91)
Amounts reclassified into net income: Realized losses on AFS securities, Gross (1,885) (1,762) (375) 937
Total unrealized gains on investment securities, Gross 33,965 53,884 61,211 122,248
Amount reclassified into net income: Net actuarial loss, Gross 508 1,517 1,015 3,033
Total defined pension and other post-retirement benefit plans, Gross 508 1,517 1,015 3,033
Other comprehensive income, Gross 34,473 55,401 62,226 125,281
Comprehensive income before tax 93,402 117,712 188,729 239,467
Net income, Tax 17,503 18,710 34,637 33,553
Unrealized holding gains during the period, Tax 12,561 19,487 21,585 42,495
Non-Credit Portion of Other-Than-Temporary Impairment Losses Recognized In Other Comprehensive Income, Tax 2 (4) 2 (4)
Amounts reclassified into net income: HTM securities, Tax (15) (7) (32) (32)
Amounts reclassified into net income: Realized losses on AFS securities, Tax (660) (617) (131) 328
Total unrealized gains on investment securities, Tax 11,888 18,859 21,424 42,787
Amount reclassified into net income: Net actuarial loss, Tax 178 532 355 1,062
Total defined pension and other post-retirement benefit plans, Tax 178 532 355 1,062
Other comprehensive income, Tax 12,066 19,391 21,779 43,849
Comprehensive income, Tax 29,569 38,101 56,416 77,402
Net income 41,426 43,601 91,866 80,633
Unrealized holding gains arising during period 23,326 36,188 40,087 78,917
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent 4 6 4 6
Amounts reclassified into net income: HTM Securities (28) (12) (60) (59)
Amounts reclassified into net income: Realized (gains) losses on available-for-sale securities (1,225) (1,145) (244) 609
Total unrealized gains on investment securities 22,077 35,025 39,787 79,461
Amount reclassified into net income: Net actuarial loss 330 985 660 1,971
Total defined benefit pension and post-retirement plans 330 985 660 1,971
Other comprehensive income 22,407 36,010 40,447 81,432
Comprehensive income $ 63,833 $ 79,611 $ 132,313 $ 162,065