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Shareholders' Equity Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ (836,955) | $ 72,371 | $ 335,868
Net change in unrealized gain (loss) | 218,293 | (1,227,414) | (341,369)
Transfer of net unrealized loss from AFS to investment securities |  | 0 |
Reclassification adjustments included in earnings: [Abstract] |  |  |
Interest revenue, Investment securities | 60,394 | 42,514 | 0
Operating expense, Personnel |  | (3,483) |
Loss (gain) on available for sale securities, net | 30,636 | 971 | (3,704)
Other comprehensive income (loss), before income taxes | 309,323 | (1,187,412) | (345,073)
Federal and state income taxes | 71,468 | (278,086) | (81,576)
Other comprehensive income (loss), net of income taxes | 237,855 | (909,326) | (263,497)
Ending balance | (599,100) | (836,955) | 72,371
Unrealized Gain (Loss) on Available for Sale Securities [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (664,618) | 69,775 | 335,032
Net change in unrealized gain (loss) | 218,293 | (1,227,414) | (343,730)
Transfer of net unrealized loss from AFS to investment securities |  | 267,509 |
Reclassification adjustments included in earnings: [Abstract] |  |  |
Interest revenue, Investment securities | 0 | 0 |
Operating expense, Personnel |  | 0 |
Loss (gain) on available for sale securities, net | 30,636 | 971 | (3,704)
Other comprehensive income (loss), before income taxes | 248,929 | (958,934) | (347,434)
Federal and state income taxes | 57,523 | (224,541) | (82,177)
Other comprehensive income (loss), net of income taxes | 191,406 | (734,393) | (265,257)
Ending balance | (473,212) | (664,618) | 69,775
Accumulated Unrealized Gain/Loss on Investment Securities Transferred from AFS |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (172,337) | 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 | 60,394 | 42,514 |
Operating expense, Personnel |  | 0 |
Loss (gain) on available for sale securities, net | 0 | 0 | 0
Other comprehensive income (loss), before income taxes | 60,394 | (224,995) | 0
Federal and state income taxes | 13,945 | (52,658) | 0
Other comprehensive income (loss), net of income taxes | 46,449 | (172,337) | 0
Ending balance | (125,888) | (172,337) | 0
Unrealized Gain (Loss) on Employee Benefit Plans [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 0 | 2,596 | 836
Net change in unrealized gain (loss) | 0 | 0 | 2,361
Transfer of net unrealized loss from AFS to investment securities |  | 0 |
Reclassification adjustments included in earnings: [Abstract] |  |  |
Interest revenue, Investment securities | 0 | 0 |
Operating expense, Personnel |  | (3,483) |
Loss (gain) on available for sale securities, net | 0 | 0 | 0
Other comprehensive income (loss), before income taxes | 0 | (3,483) | 2,361
Federal and state income taxes | 0 | (887) | 601
Other comprehensive income (loss), net of income taxes | 0 | (2,596) | 1,760
Ending balance | $ 0 | $ 0 | $ 2,596

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