Investment Securities - Schedule of Restricted Equity Securities, At Cost (Details) - USD ($) $ in Thousands |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Total restricted equity securities, at cost | $ 84,168 | $ 79,046 |
| Federal Reserve Bank stock | ||
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Total restricted equity securities, at cost | 45,493 | 45,227 |
| FHLB stock | ||
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Total restricted equity securities, at cost | 37,257 | 32,401 |
| First National Banker's Bankshares, Inc. stock | ||
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Total restricted equity securities, at cost | 1,168 | 1,168 |
| Pacific Coast Banker's Bank stock | ||
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Total restricted equity securities, at cost | $ 250 | $ 250 |