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Investment Securities - Credit quality indicator (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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AAA/AA/A |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Total debt securities held-to-maturity | $ 243,583 | $ 238,404
AAA/AA/A | Obligations of states and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Total debt securities held-to-maturity | 192,156 | 192,070
AAA/AA/A | Private label residential mortgage and asset backed securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Total debt securities held-to-maturity | 51,427 | 46,334
AAA/AA/A | Corporate debt securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Total debt securities held-to-maturity | 0 | 0
BBB |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Total debt securities held-to-maturity | 30,218 | 30,173
BBB | Obligations of states and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Total debt securities held-to-maturity | 0 | 0
BBB | Private label residential mortgage and asset backed securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Total debt securities held-to-maturity | 0 | 0
BBB | Corporate debt securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Total debt securities held-to-maturity | 30,218 | 30,173
Unrated |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Total debt securities held-to-maturity | 17,629 | 24,158
Unrated | Obligations of states and political subdivisions |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Total debt securities held-to-maturity | 0 | 0
Unrated | Private label residential mortgage and asset backed securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Total debt securities held-to-maturity | 1,639 | 8,245
Unrated | Corporate debt securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Total debt securities held-to-maturity | $ 15,990 | $ 15,913

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