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Investment Securities - Bond Ratings (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 1,266,205 | $ 1,277,209
Aaa/AAA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 277,142 |
Aa/AA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 832,351 |
A |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 32,589 |
Not rated |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 5,461 |
Agency Backed |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 118,662 |
State and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 1,103,773 | 1,109,480
State and political subdivisions | Aaa/AAA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 233,372 |
State and political subdivisions | Aa/AA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 832,351 |
State and political subdivisions | A |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 32,589 |
State and political subdivisions | Not rated |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 5,461 |
State and political subdivisions | Agency Backed |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 0 |
U.S. government-sponsored enterprises |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 43,770 | $ 43,560
U.S. government-sponsored enterprises | Aaa/AAA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 43,770 |
U.S. government-sponsored enterprises | Aa/AA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 0 |
U.S. government-sponsored enterprises | A |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 0 |
U.S. government-sponsored enterprises | Not rated |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 0 |
U.S. government-sponsored enterprises | Agency Backed |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 0 |
U.S. government-sponsored mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 118,662 |
U.S. government-sponsored mortgage-backed securities | Aaa/AAA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 0 |
U.S. government-sponsored mortgage-backed securities | Aa/AA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 0 |
U.S. government-sponsored mortgage-backed securities | A |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 0 |
U.S. government-sponsored mortgage-backed securities | Not rated |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 0 |
U.S. government-sponsored mortgage-backed securities | Agency Backed |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 118,662 |

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