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Shareholders' Equity Accumulated Other Comprehensive Income (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 $ 72,371 $ 335,868 $ 104,923
Net change in unrealized gain (loss) (1,227,414) (341,369) 313,796
Transfer of net unrealized loss from AFS to investment securities 0    
Reclassification adjustments included in earnings: [Abstract]      
Interest revenue, Investment securities 42,514 0 0
Operating expense, Personnel (3,483) 0 0
Loss (gain) on available for sale securities, net 971 (3,704) (9,910)
Other comprehensive income (loss), before income taxes (1,187,412) (345,073) 303,886
Federal and state income taxes (278,086) (81,576) 72,941
Other comprehensive income (loss), net of income taxes (909,326) (263,497) 230,945
Ending balance (836,955) 72,371 335,868
Unrealized Gain (Loss) on Available for Sale Securities [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 69,775 335,032 104,996
Net change in unrealized gain (loss) (1,227,414) (343,730) 312,576
Transfer of net unrealized loss from AFS to investment securities 267,509    
Reclassification adjustments included in earnings: [Abstract]      
Interest revenue, Investment securities 0    
Operating expense, Personnel 0    
Loss (gain) on available for sale securities, net 971 (3,704) (9,910)
Other comprehensive income (loss), before income taxes (958,934) (347,434) 302,666
Federal and state income taxes (224,541) (82,177) 72,630
Other comprehensive income (loss), net of income taxes (734,393) (265,257) 230,036
Ending balance (664,618) 69,775 335,032
Accumulated Unrealized Gain/Loss on Investment Securities Transferred from AFS      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 0 0 0
Net change in unrealized gain (loss) 0 0 0
Transfer of net unrealized loss from AFS to investment securities (267,509)    
Reclassification adjustments included in earnings: [Abstract]      
Interest revenue, Investment securities 42,514    
Operating expense, Personnel 0    
Loss (gain) on available for sale securities, net 0 0 0
Other comprehensive income (loss), before income taxes (224,995) 0 0
Federal and state income taxes (52,658) 0 0
Other comprehensive income (loss), net of income taxes (172,337) 0 0
Ending balance (172,337) 0 0
Unrealized Gain (Loss) on Employee Benefit Plans [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 2,596 836 (73)
Net change in unrealized gain (loss) 0 2,361 1,220
Transfer of net unrealized loss from AFS to investment securities 0    
Reclassification adjustments included in earnings: [Abstract]      
Interest revenue, Investment securities 0    
Operating expense, Personnel (3,483)    
Loss (gain) on available for sale securities, net 0 0 0
Other comprehensive income (loss), before income taxes (3,483) 2,361 1,220
Federal and state income taxes (887) 601 311
Other comprehensive income (loss), net of income taxes (2,596) 1,760 909
Ending balance $ 0 $ 2,596 $ 836