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Investment Securities - Bond Ratings (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 1,279,095 | $ 1,283,987
Aaa/AAA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 282,362 |
Aa/AA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 845,788 |
A |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 23,200 |
Not rated |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 1,825 |
Agency Backed |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 125,920 |
State and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 1,109,685 | 1,110,424
State and political subdivisions | Aaa/AAA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 238,872 |
State and political subdivisions | Aa/AA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 845,788 |
State and political subdivisions | A |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 23,200 |
State and political subdivisions | Not rated |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 1,825 |
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 | 43,490 | $ 43,285
U.S. government-sponsored enterprises | Aaa/AAA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 43,490 |
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 | 125,920 |
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 | $ 125,920 |

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