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Investments - Debt Securities Available-for-sale, Unrealized Loss Position, Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Line Items]    
Basis $ 423,000 $ 273,400
Gross unrealized losses (200) (800)
Carrying value (fair value) 424,600 273,800
Debt securities due September 2059    
Investments, Debt and Equity Securities [Line Items]    
Basis 20,243 22,216
Gross unrealized losses (213) (238)
Carrying value (fair value) 20,030 21,978
Debt securities due September 2059 | Unrealized loss 12 months or longer    
Investments, Debt and Equity Securities [Line Items]    
Gross unrealized losses   (100)
Debt securities due September 2059 | Unrealized loss less than 12 months    
Investments, Debt and Equity Securities [Line Items]    
Gross unrealized losses   (200)
Debt Securities Due March 2060    
Investments, Debt and Equity Securities [Line Items]    
Basis 43,231  
Gross unrealized losses (4)  
Carrying value (fair value) 43,227  
Debt Securities Due January 2061    
Investments, Debt and Equity Securities [Line Items]    
Basis 15,206  
Gross unrealized losses (1)  
Carrying value (fair value) 15,205  
Debt Securities Due June 2061    
Investments, Debt and Equity Securities [Line Items]    
Basis 134,702  
Gross unrealized losses (8)  
Carrying value (fair value) 134,694  
Debt securities due November 2059    
Investments, Debt and Equity Securities [Line Items]    
Basis   14,738
Gross unrealized losses   (61)
Carrying value (fair value)   14,677
Debt securities due December 2059    
Investments, Debt and Equity Securities [Line Items]    
Basis   47,270
Gross unrealized losses   (315)
Carrying value (fair value)   46,955
Debt securities due September 2060    
Investments, Debt and Equity Securities [Line Items]    
Basis   34,970
Gross unrealized losses   (44)
Carrying value (fair value)   34,926
Debt securities due June 2060    
Investments, Debt and Equity Securities [Line Items]    
Basis   35,127
Gross unrealized losses   (119)
Carrying value (fair value)   35,008
Total basis    
Investments, Debt and Equity Securities [Line Items]    
Basis 213,382 154,321
Total gross unrealized losses    
Investments, Debt and Equity Securities [Line Items]    
Gross unrealized losses (226) (777)
Total carrying value (fair value)    
Investments, Debt and Equity Securities [Line Items]    
Carrying value (fair value) $ 213,156 $ 153,544