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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value $ 75,062 $ 255,984
Less than 12 months, unrealized losses 357 (1,319)
12 months or more, fair value 0 41,491
12 months or more, unrealized losses 0 (435)
Total, fair value 75,062 297,475
Total, unrealized losses 357 (1,754)
    Obligations of U.S. Government-sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 4,997  
Less than 12 months, unrealized losses 3  
12 months or more, fair value 0  
12 months or more, unrealized losses 0  
Total, fair value 4,997  
Total, unrealized losses 3  
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 4,079 56,327
Less than 12 months, unrealized losses 33 363
12 months or more, fair value 0 0
12 months or more, unrealized losses 0 0
Total, fair value 4,079 56,327
Total, unrealized losses 33 363
Agency mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 65,986 131,693
Less than 12 months, unrealized losses 321 756
12 months or more, fair value 0 41,491
12 months or more, unrealized losses 0 435
Total, fair value 65,986 173,184
Total, unrealized losses $ 321 1,191
Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value   67,964
Less than 12 months, unrealized losses   200
12 months or more, fair value   0
12 months or more, unrealized losses   0
Total, fair value   67,964
Total, unrealized losses   $ 200