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Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total other comprehensive income (loss) $ (221,380) $ 57,869 $ (563,842) $ (60,176)
Income tax benefit (expense) 46,490 (12,152) 118,407 12,637
Other comprehensive income (loss), net of tax (174,890) 45,717 (445,435) (47,539)
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]        
Total reclassifications before tax 315,891 193,868 535,330 383,485
Income tax benefit (expense) (66,623) (40,817) (111,049) (80,413)
Total reclassifications, net of tax 249,268 153,051 424,281 303,072
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period     4,861,382  
Other comprehensive income (loss) before reclassifications     (444,416)  
Less: Amounts reclassified from AOCI     1,019  
Balance, end of period 4,573,019 4,914,707 4,573,019 4,914,707
Reclassification from Accumulated Other Comprehensive Income        
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]        
Total reclassifications before tax (3,053) 1,638 1,290 4,473
Income tax benefit (expense) 641 (344) (271) (939)
Total reclassifications, net of tax (2,412) 1,294 1,019 3,534
Accumulated other comprehensive income (loss)        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other comprehensive income (loss), net of tax (174,890) 45,717 (445,435) (47,539)
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (150,848) 123,565 119,697 216,821
Balance, end of period (325,738) 169,282 (325,738) 169,282
Net unrealized gains and (losses) on available-for-sale securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total other comprehensive income (loss) (222,000) 57,030 (564,960) (62,120)
Income tax benefit (expense) 46,620 (11,976) 118,642 13,045
Other comprehensive income (loss), net of tax (175,380) 45,054 (446,318) (49,075)
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period     150,038  
Other comprehensive income (loss) before reclassifications     (444,416)  
Less: Amounts reclassified from AOCI     1,902  
Balance, end of period (296,280)   (296,280)  
Net unrealized gains and (losses) on available-for-sale securities | Reclassification from Accumulated Other Comprehensive Income        
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]        
Total reclassifications before tax (2,433) 2,477 2,408 6,417
Income tax benefit (expense) 511 (520) (506) (1,347)
Total reclassifications, net of tax (1,922) 1,957 1,902 5,070
Net benefit plan assets and (obligations) recognized in shareholders' equity        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total other comprehensive income (loss) 620 839 1,118 1,944
Income tax benefit (expense) (130) (176) (235) (408)
Other comprehensive income (loss), net of tax 490 663 883 1,536
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period     (30,341)  
Other comprehensive income (loss) before reclassifications     0  
Less: Amounts reclassified from AOCI     (883)  
Balance, end of period (29,458)   (29,458)  
Net benefit plan assets and (obligations) recognized in shareholders' equity | Reclassification from Accumulated Other Comprehensive Income        
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract]        
Total reclassifications before tax (620) (839) (1,118) (1,944)
Income tax benefit (expense) 130 176 235 408
Total reclassifications, net of tax $ (490) $ (663) $ (883) $ (1,536)