Commitments and Contingencies Outstanding Commitments to Extend Credit and Letters of Credit (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Valuation allowances and reserves, balance | $ 400 | $ 800 |
| Commitments to Extend Credit [Member] | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Valuation allowances and reserves, balance | 9,329,977 | 8,710,163 |
| Standby Letters of Credit [Member] | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Valuation allowances and reserves, balance | 298,520 | 311,697 |
| Commercial Letters of Credit [Member] | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Valuation allowances and reserves, balance | $ 25,738 | $ 29,842 |