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Fair Value (Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance $ 38,200,000 $ 27,100,000
Included in net realized and unrealized investment gains (losses) $ 500,000 $ 600,000
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain Loss On Investments From Continuing Operations Gain Loss On Investments From Continuing Operations
Included in other comprehensive income (loss) - changes in net unrealized gains (losses) on investment securities $ (600,000) $ (500,000)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax
Settlements $ (3,100,000) $ (3,100,000)
Ending Balance 36,200,000 38,200,000
Changes in net unrealized gains (losses) for the period included in other comprehensive income (loss) for assets held at the end of the year $ (600,000) $ (500,000)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain Loss On Investments From Continuing Operations Gain Loss On Investments From Continuing Operations
Municipals [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance $ 7,600,000 $ 8,600,000
Included in other comprehensive income (loss) - changes in net unrealized gains (losses) on investment securities 300,000  
Settlements (500,000) (1,000,000)
Ending Balance 7,400,000 7,600,000
Changes in net unrealized gains (losses) for the period included in other comprehensive income (loss) for assets held at the end of the year 300,000 0
Corporates [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance   100,000
Transfers out of Level 3   (100,000)
Commercial Mortgage-Backed [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance 5,900,000 7,000,000.0
Included in other comprehensive income (loss) - changes in net unrealized gains (losses) on investment securities 300,000 (500,000)
Settlements (1,300,000) (600,000)
Ending Balance 4,900,000 5,900,000
Changes in net unrealized gains (losses) for the period included in other comprehensive income (loss) for assets held at the end of the year 300,000 (500,000)
Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance 13,500,000 15,700,000
Transfers out of Level 3   (100,000)
Included in other comprehensive income (loss) - changes in net unrealized gains (losses) on investment securities 600,000 (500,000)
Settlements (1,800,000) (1,600,000)
Ending Balance 12,300,000 13,500,000
Changes in net unrealized gains (losses) for the period included in other comprehensive income (loss) for assets held at the end of the year 600,000 (500,000)
Equities and Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance 24,700,000 11,400,000
Included in net realized and unrealized investment gains (losses) 500,000 600,000
Addition   14,200,000
Settlements (1,300,000) (1,500,000)
Ending Balance $ 23,900,000 $ 24,700,000