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Investments (Realized Gains (Losses)) (Details)
3 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Gain (Loss) on Securities [Line Items]    
Proceeds from Sale of Debt Securities, Available-for-sale $ 2,865,000 $ 1,100,000
Debt Securities [Member]    
Gain (Loss) on Securities [Line Items]    
Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff 0 0
Proceeds from Sale of Debt Securities, Available-for-sale 2,865,000 1,100,000
Debt Securities, Available-for-sale, Realized Gain 5,000 0
Debt Securities, Available-for-sale, Realized Loss $ 12,000 $ 0
Number of Debt Securities Sold 4 1