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Investment Securities - Credit Quality Indicator (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | $ 1,518,076 | $ 335,946
State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 1,210,287 | 312,416
Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 17,310 | $ 1,176
Aaa/AAA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 245,157 |
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 | 804,154 |
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 | 127,661 |
A | Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Baa/BBB | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 11,351 |
Baa/BBB | Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 0 |
Not Rated | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 21,964 |
Not Rated | Other securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 17,310 |
Not Guaranteed or Pre-Refunded | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 678,424 |
Not Guaranteed or Pre-Refunded | Aaa/AAA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 130,326 |
Not Guaranteed or Pre-Refunded | Aa/AA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 495,498 |
Not Guaranteed or Pre-Refunded | A | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 45,229 |
Not Guaranteed or Pre-Refunded | Baa/BBB | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 1,049 |
Not Guaranteed or Pre-Refunded | Not Rated | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 6,322 |
Other Credit Enhancement or Insurance | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 531,863 |
Other Credit Enhancement or Insurance | Aaa/AAA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 114,831 |
Other Credit Enhancement or Insurance | Aa/AA | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 308,656 |
Other Credit Enhancement or Insurance | A | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 82,432 |
Other Credit Enhancement or Insurance | Baa/BBB | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 10,302 |
Other Credit Enhancement or Insurance | Not Rated | State and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | 15,642 |
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 | Baa/BBB | 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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