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Investment Securities - Credit Quality Indicator (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | $ 3,639,850 | $ 3,729,502
State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 1,857,373 | 1,858,680
Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 256,576 | $ 256,007
Aaa/AAA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 483,116 |
Aaa/AAA | Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Aa/AA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 1,153,707 |
Aa/AA | Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
A | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 200,577 |
A | Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 108,527 |
Bond, Baa/BBB Rating | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 4,386 |
Bond, Baa/BBB Rating | Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 148,049 |
Not Rated | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 15,587 |
Not Rated | Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Not Guaranteed or Pre-Refunded | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 864,860 |
Not Guaranteed or Pre-Refunded | Aaa/AAA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 182,920 |
Not Guaranteed or Pre-Refunded | Aa/AA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 627,680 |
Not Guaranteed or Pre-Refunded | A | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 38,673 |
Not Guaranteed or Pre-Refunded | Bond, Baa/BBB Rating | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Not Guaranteed or Pre-Refunded | Not Rated | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 15,587 |
Other Credit Enhancement or Insurance | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 992,513 |
Other Credit Enhancement or Insurance | Aaa/AAA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 300,196 |
Other Credit Enhancement or Insurance | Aa/AA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 526,027 |
Other Credit Enhancement or Insurance | A | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 161,904 |
Other Credit Enhancement or Insurance | Bond, Baa/BBB Rating | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 4,386 |
Other Credit Enhancement or Insurance | Not Rated | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Pre-Refunded | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Pre-Refunded | Aaa/AAA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Pre-Refunded | Aa/AA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Pre-Refunded | A | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Pre-Refunded | Bond, Baa/BBB Rating | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Pre-Refunded | Not Rated | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | $ 0 |

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