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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Net income, Gross $ 55,443 $ 65,839 $ 169,629 $ 168,894
Unrealized holding (losses) gains during the period, Gross (12,992) 8,371 108,420 (27,896)
Non-credit portion of OTTI recognized in OCI, Gross     (10)  
Amounts reclassified into net income: HTM securities, Gross (13) (97) (104) (543)
Amounts reclassified into net income: Non-credit OTTI, Gross       357
Realized gains on AFS securities, Gross (3,684) (305) (2,747) (16,778)
Total unrealized (losses) gains on investment securities, Gross (16,689) 7,969 105,559 (44,860)
Amount reclassified into net income: Net actuarial loss, Gross 1,615 1,709 4,648 5,127
Total defined pension and other post-retirement benefit plans, Gross 1,615 1,709 4,648 5,127
Other comprehensive (loss) income, Gross (15,074) 9,678 110,207 (39,733)
Comprehensive income before tax 40,369 75,517 279,836 129,161
Net income, Tax 16,941 18,843 50,494 48,422
Unrealized holding (losses) gains during the period, Tax (4,548) 2,929 37,947 (9,764)
Non-credit portion of OTTI recognized in OCI, Tax     (4)  
Amounts reclassified into net income: HTM securities, Tax (4) (34) (36) (190)
Amounts reclassified into net income: Non-credit OTTI, Tax       125
Realized gains on AFS securities, Tax (1,289) (106) (961) (5,872)
Total unrealized (losses) gains on investment securities, Tax (5,841) 2,789 36,946 (15,701)
Amount reclassified into net income: Net actuarial loss, Tax 565 599 1,627 1,795
Total defined pension and other post-retirement benefit plans, Tax 565 599 1,627 1,795
Other comprehensive (loss) income, Tax (5,276) 3,388 38,573 (13,906)
Comprehensive income, Tax 11,665 22,231 89,067 34,516
Net income 38,502 46,996 119,135 120,472
Unrealized holding (losses) gains arising during period (8,444) 5,442 70,473 (18,132)
Non-credit portion of OTTI recognized in OCI     (6)  
Amounts reclassified into net income: HTM Securities (9) (63) (68) (353)
Amounts reclassified into net income: Non-credit OTTI 0 0 0 232
Realized gains on available-for-sale securities (2,395) (199) (1,786) (10,906)
Total unrealized (losses) gains on investment securities (10,848) 5,180 68,613 (29,159)
Amount reclassified into net income: Net actuarial loss 1,050 1,110 3,021 3,332
Total defined benefit pension and post-retirement plans 1,050 1,110 3,021 3,332
Other comprehensive (loss) income (9,798) 6,290 71,634 (25,827)
Comprehensive income $ 28,704 $ 53,286 $ 190,769 $ 94,645