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Investment Securities - Credit Quality Indicator (Details) $ in Thousands | Dec. 31, 2021 USD ($)
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State and political subdivisions |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Amortized Cost | $ 1,210,248
Other securities |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Amortized Cost | 17,301
Aaa/AAA | State and political subdivisions |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Amortized Cost | 232,185
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 | 798,232
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 | 132,370
A | Other securities |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Amortized Cost | 0
Bond, Baa/BBB Rating | State and political subdivisions |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Amortized Cost | 13,539
Bond, Baa/BBB Rating | Other securities |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Amortized Cost |
Not Rated | State and political subdivisions |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Amortized Cost | 33,922
Not Rated | Other securities |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Amortized Cost | 17,301
Not Guaranteed or Pre-Refunded | State and political subdivisions |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Amortized Cost | 660,294
Not Guaranteed or Pre-Refunded | Aaa/AAA | State and political subdivisions |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Amortized Cost | 129,473
Not Guaranteed or Pre-Refunded | Aa/AA | State and political subdivisions |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Amortized Cost | 481,887
Not Guaranteed or Pre-Refunded | A | State and political subdivisions |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Amortized Cost | 42,727
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 | 6,207
Other Credit Enhancement or Insurance | State and political subdivisions |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Amortized Cost | 549,954
Other Credit Enhancement or Insurance | Aaa/AAA | State and political subdivisions |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Amortized Cost | 102,712
Other Credit Enhancement or Insurance | Aa/AA | State and political subdivisions |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Amortized Cost | 316,345
Other Credit Enhancement or Insurance | A | State and political subdivisions |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Amortized Cost | 89,643
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 | 13,539
Other Credit Enhancement or Insurance | Not Rated | State and political subdivisions |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |
Amortized Cost | 27,715
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 |
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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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