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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net Income $ 65,633 $ 48,905 $ 150,310 $ 137,752
Other Comprehensive (Loss) Income, net of tax:        
Unrealized (loss) gain on securities (12,531) 3,320 (46,806) 17,861
Reclassification adjustment for securities gains included in net income (11) (2,988) (30) (4,639)
Amortization of net unrealized losses on available for sale securities transferred to held to maturity 791 0 791 0
Non-credit related unrealized gain on other-than-temporarily impaired debt securities 0 0 232 0
Amortization of net unrecognized pension and postretirement items 369 340 1,248 1,024
Other Comprehensive (Loss) Income (11,382) 672 (44,565) 14,246
Total Comprehensive Income $ 54,251 $ 49,577 $ 105,745 $ 151,998