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Investment Securities - Bond Ratings (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 1,282,591 | $ 1,283,987
Aaa/AAA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 278,435 |
Aa/AA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 845,485 |
A |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 27,686 |
Not rated |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 1,908 |
Agency Backed |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 129,077 |
State and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 1,110,161 | 1,110,424
State and political subdivisions | Aaa/AAA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 235,082 |
State and political subdivisions | Aa/AA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 845,485 |
State and political subdivisions | A |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 27,686 |
State and political subdivisions | Not rated |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 1,908 |
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 | 43,353 | $ 43,285
U.S. government-sponsored enterprises | Aaa/AAA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 43,353 |
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 |
Other Security Investments [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 129,077 |
Other Security Investments [Member] | Aaa/AAA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 0 |
Other Security Investments [Member] | Aa/AA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 0 |
Other Security Investments [Member] | A |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 0 |
Other Security Investments [Member] | Not rated |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 0 |
Other Security Investments [Member] | Agency Backed |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 129,077 |

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