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Accumulated Other Comprehensive Loss, Net of Tax (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance $ 3,234,625 $ 3,207,770 $ 2,886,515
Other comprehensive (loss) income, net of tax (64,836) 78,328 94,580
Ending Balance 3,438,325 3,234,625 3,207,770
Available For Sale and Transferred Securities [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 67,424 17,251 (71,374)
Other comprehensive (loss) income before reclassifications (62,888) 50,179 88,647
Amounts reclassified from accumulated other comprehensive loss 0 (6) (22)
Other comprehensive (loss) income, net of tax (62,888) 50,173 88,625
Ending Balance 4,536 67,424 17,251
Derivative Instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 19,918 (9,184) (9,313)
Other comprehensive (loss) income before reclassifications (17,109) 20,667 (4,945)
Amounts reclassified from accumulated other comprehensive loss 3,261 8,435 5,074
Other comprehensive (loss) income, net of tax (13,848) 29,102 129
Ending Balance 6,070 19,918 (9,184)
Defined Benefit Pension and Postretirement Benefit Plans [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (45,086) (44,139) (49,965)
Other comprehensive (loss) income before reclassifications 8,876 (3,887) 1,622
Amounts reclassified from accumulated other comprehensive loss 3,024 2,940 4,204
Other comprehensive (loss) income, net of tax 11,900 (947) 5,826
Ending Balance (33,186) (45,086) (44,139)
AOCI Attributable to Parent [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 42,256 (36,072) (130,652)
Other comprehensive (loss) income before reclassifications (71,121) 66,959 85,324
Amounts reclassified from accumulated other comprehensive loss 6,285 11,369 9,256
Other comprehensive (loss) income, net of tax (64,836) 78,328 94,580
Ending Balance $ (22,580) $ 42,256 $ (36,072)