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Investment Securities - Credit Quality Indicator (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | $ 3,761,094 | $ 1,530,500
State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 1,861,102 | 1,210,248
Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 261,199 | $ 17,301
Aaa/AAA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 467,238 |
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 | 1,169,933 |
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 | 202,910 |
A | Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 173,142 |
Bond, Baa/BBB Rating | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 5,938 |
Bond, Baa/BBB Rating | Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 53,573 |
Not Rated | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 15,083 |
Not Rated | Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 34,484 |
Not Guaranteed or Pre-Refunded | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 901,932 |
Not Guaranteed or Pre-Refunded | Aaa/AAA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 183,096 |
Not Guaranteed or Pre-Refunded | Aa/AA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 665,150 |
Not Guaranteed or Pre-Refunded | A | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 45,471 |
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 | 8,215 |
Other Credit Enhancement or Insurance | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 959,170 |
Other Credit Enhancement or Insurance | Aaa/AAA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 284,142 |
Other Credit Enhancement or Insurance | Aa/AA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 504,783 |
Other Credit Enhancement or Insurance | A | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 157,439 |
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 | 5,938 |
Other Credit Enhancement or Insurance | Not Rated | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 6,868 |
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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