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Investments - Credit Quality Indicator (Details)
Mar. 31, 2024
USD ($)
AAA/AA/A  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Total debt securities held-to-maturity $ 238,415
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 192,099
AAA/AA/A | Private label mortgage and asset backed securities  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Total debt securities held-to-maturity 46,316
AAA/AA/A | Corporate debt securities  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Total debt securities held-to-maturity 0
BBB  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Total debt securities held-to-maturity 30,182
BBB | Obligations of states and political subdivisions  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Total debt securities held-to-maturity 0
BBB | Private label mortgage and asset backed securities  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Total debt securities held-to-maturity 0
BBB | Corporate debt securities  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Total debt securities held-to-maturity 30,182
Unrated  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Total debt securities held-to-maturity 23,968
Unrated | Obligations of states and political subdivisions  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Total debt securities held-to-maturity 0
Unrated | Private label mortgage and asset backed securities  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Total debt securities held-to-maturity 8,038
Unrated | Corporate debt securities  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Total debt securities held-to-maturity $ 15,930