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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2025
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 |  |  |  |  |  | Total
Balance, Dec. 31, 2023 |  | $ | (473,212) |  |  | $ | (125,888) |  |  |  |  |  |  | $ | (599,100) |
Net change in unrealized gain (loss) |  | 263,436 |  |  | — |  |  |  |  |  |  | 263,436 |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |  |  |
Interest revenue, Investment securities |  | — |  |  | 35,641 |  |  |  |  |  |  | 35,641 |
Loss on available-for-sale securities, net |  | 45,828 |  |  | — |  |  |  |  |  |  | 45,828 |
Other comprehensive income (loss), before income taxes |  | 309,264 |  |  | 35,641 |  |  |  |  |  |  | 344,905 |
Federal and state income taxes |  | 72,711 |  |  | 8,383 |  |  |  |  |  |  | 81,094 |
Other comprehensive income (loss), net of income taxes |  | 236,553 |  |  | 27,258 |  |  |  |  |  |  | 263,811 |
Balance, September 30, 2024 |  | $ | (236,659) |  |  | $ | (98,630) |  |  |  |  |  |  | $ | (335,289) |
Balance, Dec. 31, 2024 |  | $ | (412,348) |  |  | $ | (90,692) |  |  |  |  |  |  | $ | (503,040) |
Net change in unrealized gain (loss) |  | 333,866 |  |  | — |  |  |  |  |  |  | 333,866 |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |  |  |
Interest revenue, Investment securities |  | — |  |  | 27,280 |  |  |  |  |  |  | 27,280 |
Gain on available-for-sale securities, net |  | (213) |  |  | — |  |  |  |  |  |  | (213) |
Other comprehensive income (loss), before income taxes |  | 333,653 |  |  | 27,280 |  |  |  |  |  |  | 360,933 |
Federal and state income taxes |  | 78,244 |  |  | 6,313 |  |  |  |  |  |  | 84,557 |
Other comprehensive income (loss), net of income taxes |  | 255,409 |  |  | 20,967 |  |  |  |  |  |  | 276,376 |
Balance, September 30, 2025 |  | $ | (156,939) |  |  | $ | (69,725) |  |  |  |  |  |  | $ | (226,664) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
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