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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, 2022
Dec. 31, 2021
Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance $ 3,438,325 $ 3,234,625 $ 3,207,770
Other comprehensive (loss) income, net of tax (662,380) (64,836) 78,328
Ending Balance 8,056,186 3,438,325 3,234,625
Available For Sale and Transferred Securities [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 4,536 67,424 17,251
Other comprehensive (loss) before reclassifications (640,656) (62,888) 50,179
Amounts reclassified from accumulated other comprehensive loss 4,960 0 (6)
Other comprehensive (loss) income, net of tax (635,696) (62,888) 50,173
Ending Balance (631,160) 4,536 67,424
Derivative Instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 6,070 19,918 (9,184)
Other comprehensive (loss) before reclassifications (17,810) (17,109) 20,667
Amounts reclassified from accumulated other comprehensive loss 2,866 3,261 8,435
Other comprehensive (loss) income, net of tax (14,944) (13,848) 29,102
Ending Balance (8,874) 6,070 19,918
Defined Benefit Pension and Postretirement Benefit Plans [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (33,186) (45,086) (44,139)
Other comprehensive (loss) before reclassifications (13,350) 8,876 (3,887)
Amounts reclassified from accumulated other comprehensive loss 1,610 3,024 2,940
Other comprehensive (loss) income, net of tax (11,740) 11,900 (947)
Ending Balance (44,926) (33,186) (45,086)
AOCI Attributable to Parent [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (22,580) 42,256 (36,072)
Other comprehensive (loss) before reclassifications (671,816) (71,121) 66,959
Amounts reclassified from accumulated other comprehensive loss 9,436 6,285 11,369
Other comprehensive (loss) income, net of tax (662,380) (64,836) 78,328
Ending Balance $ (684,960) $ (22,580) $ 42,256