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Accumulated Other Comprehensive Income (Loss) (Components of AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Amounts reclassified from accumulated other comprehensive loss $ (11,622) $ 5,933 $ (27,704) $ 14,926
Net current period other comprehensive (loss) income (4,092) 8,959 112,967 63,415
Unrealized Losses on Investment Securities Available for Sale        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 113,102   5,792  
Net unrealized gains arising during period 7,530 3,026 140,671 48,489
Amounts reclassified from accumulated other comprehensive loss (16,497) (874) (42,328) (5,278)
Net current period other comprehensive (loss) income (8,967) 2,152 98,343 43,211
Ending balance 104,135 4,706 104,135 4,706
Unrealized Losses On Securities Available For Sale Transferred To Held To Maturity        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 0   0  
Net unrealized gains arising during period 0 0 0 0
Amounts reclassified from accumulated other comprehensive loss 0 4,693 0 13,863
Net current period other comprehensive (loss) income 0 4,693 0 13,863
Ending balance 0 (57,286) 0 (57,286)
Defined Benefit Pension Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (122,766)   (132,515)  
Net unrealized gains arising during period 0 0 0 0
Amounts reclassified from accumulated other comprehensive loss 4,875 2,114 14,624 6,341
Net current period other comprehensive (loss) income 4,875 2,114 14,624 6,341
Ending balance (117,891) (119,192) (117,891) (119,192)
Accumulated Other Comprehensive (Loss) Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (9,664)   (126,723)  
Net unrealized gains arising during period 7,530 3,026 140,671 48,489
Amounts reclassified from accumulated other comprehensive loss (11,622) 5,933 (27,704) 14,926
Net current period other comprehensive (loss) income (4,092) 8,959 112,967 63,415
Ending balance $ (13,756) (171,772) $ (13,756) (171,772)
Previously Reported | Unrealized Losses on Investment Securities Available for Sale        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance   2,554   (38,505)
Previously Reported | Unrealized Losses On Securities Available For Sale Transferred To Held To Maturity        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance   (61,979)   (71,149)
Previously Reported | Defined Benefit Pension Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance   (121,306)   (125,533)
Previously Reported | Accumulated Other Comprehensive (Loss) Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance   $ (180,731)   $ (235,187)