Capital (Regulatory Capital Requirements) (Details) - USD ($) $ in Thousands |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Regulatory capital requirements: | ||
| Risk-based capital, Required | $ 867,559 | $ 835,212 |
| Risk-based capital, Actual | $ 4,035,916 | $ 3,777,209 |
| Total regulatory capital-to-asset ratio, Actual | 5.40% | 5.60% |
| Total regulatory capital, Required | $ 3,200,491 | $ 3,036,039 |
| Total regulatory capital, Actual | $ 4,282,461 | $ 4,242,916 |
| Leverage capital ratio, Actual | 7.90% | 8.10% |
| Leverage capital, Required | $ 4,000,613 | $ 3,795,049 |
| Leverage capital, Actual | $ 6,300,419 | $ 6,131,521 |