Commitments and Contingent Liabilities - Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Financial instruments with off-balance sheet risk | ||
| Contract amount | $ 6,800,000 | $ 6,900,000 |
| Commitments to extend credit | ||
| Financial instruments with off-balance sheet risk | ||
| Contract amount | 6,554,288 | 6,635,946 |
| Standby letters of credit | ||
| Financial instruments with off-balance sheet risk | ||
| Contract amount | 252,591 | 252,166 |
| Commercial letters of credit | ||
| Financial instruments with off-balance sheet risk | ||
| Contract amount | $ 2,366 | $ 2,040 |