Statements of Comprehensive Income - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Statement of Comprehensive Income [Abstract] | ||||||||
| Net Income | $ 157,603 | $ 159,741 | $ 464,806 | $ 468,461 | ||||
| Other Comprehensive income (loss) | ||||||||
| Net change in unrealized gains (losses) on available-for-sale securities | (457,243) | 88,323 | (562,802) | 378,331 | ||||
| Net change in non-credit portion on held-to-maturity securities | 0 | 479 | 0 | 569 | ||||
| Net change due to hedging activities | ||||||||
| Cash flow hedges | [1] | 10,858 | (6,419) | 13,462 | (34,191) | |||
| Fair value hedges | [2] | 363,308 | (42,564) | 456,854 | (292,336) | |||
| Total net change due to hedging activities | 374,166 | (48,983) | 470,316 | (326,527) | ||||
| Net change in pension and postretirement benefits | 122 | (69) | 365 | (206) | ||||
| Total other comprehensive income (loss) | (82,955) | 39,750 | (92,121) | 52,167 | ||||
| Total comprehensive income (loss) | $ 74,648 | $ 199,491 | $ 372,685 | $ 520,628 | ||||
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