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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2022
Stockholders' Equity Note [Abstract] |
Accumulated Other Comprehensive Income (Loss) [Table Text Block] | A rollforward of the components of accumulated other comprehensive income (loss) is included as follows (in thousands):
|  | Unrealized Gain (Loss) on |  |  |  |
|  | Available for Sale Securities |  | Investment Securities Transferred from AFS |  | Employee Benefit Plans |  |  |  | Total
Balance, Dec. 31, 2020 |  | $ | 335,032 |  |  | $ | — |  |  | $ | 836 |  |  |  |  | $ | 335,868 |
Net change in unrealized gain (loss) |  | (216,176) |  |  | — |  |  | — |  |  |  |  | (216,176) |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |  |  |
Gain on available for sale securities, net |  | (3,152) |  |  | — |  |  | — |  |  |  |  | (3,152) |
Other comprehensive loss, before income taxes |  | (219,328) |  |  | — |  |  | — |  |  |  |  | (219,328) |
Federal and state income taxes |  | (52,632) |  |  | — |  |  | — |  |  |  |  | (52,632) |
Other comprehensive loss, net of income taxes |  | (166,696) |  |  | — |  |  | — |  |  |  |  | (166,696) |
Balance, September 30, 2021 |  | $ | 168,336 |  |  | $ | — |  |  | $ | 836 |  |  |  |  | $ | 169,172 |
Balance, Dec. 31, 2021 |  | $ | 69,775 |  |  | $ | — |  |  | $ | 2,596 |  |  |  |  | $ | 72,371 |
Net change in unrealized gain (loss) |  | (1,293,661) |  |  | — |  |  | — |  |  |  |  | (1,293,661) |
Transfer of net unrealized loss from AFS to investment securities |  | 267,509 |  |  | (267,509) |  |  | — |  |  |  |  | — |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |  |  |
Interest revenue, Investment securities |  | — |  |  | 24,130 |  |  | — |  |  |  |  | 24,130 |
Operating expense, Personnel |  | — |  |  | — |  |  | (3,483) |  |  |  |  | (3,483) |
Gain on available for sale securities, net |  | (3,017) |  |  | — |  |  | — |  |  |  |  | (3,017) |
Other comprehensive loss, before income taxes |  | (1,029,169) |  |  | (243,379) |  |  | (3,483) |  |  |  |  | (1,276,031) |
Federal and state income taxes |  | (240,868) |  |  | (56,960) |  |  | (887) |  |  |  |  | (298,715) |
Other comprehensive loss, net of income taxes |  | (788,301) |  |  | (186,419) |  |  | (2,596) |  |  |  |  | (977,316) |
Balance, September 30, 2022 |  | $ | (718,526) |  |  | $ | (186,419) |  |  | $ | — |  |  |  |  | $ | (904,945) |

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