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Accumulated Other Comprehensive (Loss), Net of Tax - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net unrealized gains (losses) | $ 220 | $ (136,224) | $ (33,620)
Tax (expense) benefit | (257,347) | (248,300) | (216,664)
Net income | 1,002,802 | 768,707 | 867,840
Hedge terminations | (1,523,614) | (1,588,899) | (1,290,991)
Time-value premiums | 4,021,508 | 3,927,286 | 3,628,260
Other expense | (155,996) | (139,309) | (168,748)
Cash Flow Hedging |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Estimate of amount to be reclassified from AOCL | (4,100) |  |
Investment Securities Available- for-Sale | Reclassification out of accumulated comprehensive income |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net unrealized gains (losses) | 528 | (141,418) | (31,533)
Tax (expense) benefit | (143) | 37,839 | 8,477
Net income | 385 | (103,579) | (23,056)
Derivative Financial Instruments | Reclassification out of accumulated comprehensive income |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Tax (expense) benefit | 2,768 | 11,324 | 4,050
Net income | (7,439) | (30,715) | (10,888)
Interest payments | (10,207) | (41,472) | (12,279)
Hedge terminations | 0 | (34) | (310)
Time-value premiums | 0 | (533) | (2,349)
Defined Benefit Pension and Other Postretirement Benefit Plans | Reclassification out of accumulated comprehensive income |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Tax (expense) benefit | 412 | 517 | 1,072
Net income | (1,108) | (1,390) | (2,880)
Transition obligation | Reclassification out of accumulated comprehensive income |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other expense | 2 | 0 | 0
Net actuarial (losses) | Reclassification out of accumulated comprehensive income |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other expense | (1,522) | (1,907) | (2,083)
Other | Reclassification out of accumulated comprehensive income |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other expense | $ 0 | $ 0 | $ (1,869)

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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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