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Accumulated Other Comprehensive Income Components of Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance     $ 2,229,857 $ 2,121,115
Amortization of net unrealized losses on available for sale securities transferred to held to maturity $ 791 $ 0 791 0
Reclassification of stranded tax effects [1]     0  
Ending Balance 2,283,014 2,225,786 2,283,014 2,225,786
Unrealized Gains (Losses) on Investment Securities Not Other-Than-Temporarily Impaired        
Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance (56,690) (10,157) (18,509) (23,047)
Other comprehensive loss before reclassifications (12,531) 3,320 (46,806) 17,861
Amounts reclassified from accumulated other comprehensive income (loss) (11) (2,988) (30) (4,639)
Amortization of net unrealized losses on available for sale securities transferred to held to maturity 791   791  
Reclassification of stranded tax effects     (3,887)  
Ending Balance (68,441) (9,825) (68,441) (9,825)
Unrealized Non-Credit Gains (Losses) on Other-Than-Temporarily Impaired Debt Securities        
Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance 690 273 458 273
Other comprehensive loss before reclassifications 0 0 232 0
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0 0
Amortization of net unrealized losses on available for sale securities transferred to held to maturity 0   0  
Reclassification of stranded tax effects     0  
Ending Balance 690 273 690 273
Unrecognized Pension and Postretirement Plan Income (Costs)        
Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance (17,258) (14,991) (14,923) (15,675)
Other comprehensive loss before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive income (loss) 369 340 1,248 1,024
Amortization of net unrealized losses on available for sale securities transferred to held to maturity 0   0  
Reclassification of stranded tax effects     (3,214)  
Ending Balance (16,889) (14,651) (16,889) (14,651)
Total        
Accumulated Other Comprehensive Income [Roll Forward]        
Beginning Balance (73,258) (24,875) (32,974) (38,449)
Other comprehensive loss before reclassifications (12,531) 3,320 (46,574) 17,861
Amounts reclassified from accumulated other comprehensive income (loss) 358 (2,648) 1,218 (3,615)
Amortization of net unrealized losses on available for sale securities transferred to held to maturity 791   791  
Reclassification of stranded tax effects [1]     (7,101)  
Ending Balance $ (84,640) $ (24,203) $ (84,640) $ (24,203)
[1] Result of adoption of ASU 2018-02, See Note 1 to Consolidated Financial Statements for further details.