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FAIR VALUE - (Financial Instruments Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Fair value $ 327,532 $ 488,210
Equity securities, at fair value 5,905 3,157
Total investments, at fair value 333,437 491,367
Embedded Derivative Financial Instruments    
Investments, Debt and Equity Securities [Abstract]    
Other assets - embedded derivative, at fair value 10,725  
United States government obligations and authorities    
Investments, Debt and Equity Securities [Abstract]    
Fair value 90,692 171,775
Obligations of states and political subdivisions    
Investments, Debt and Equity Securities [Abstract]    
Fair value 19,278 22,264
Corporate securities    
Investments, Debt and Equity Securities [Abstract]    
Fair value 188,980 266,528
International securities    
Investments, Debt and Equity Securities [Abstract]    
Fair value 28,582 27,643
Level 1    
Investments, Debt and Equity Securities [Abstract]    
Fair value 42,026 38,511
Equity securities, at fair value 1,879 1,881
Total investments, at fair value 43,905 40,392
Level 1 | Embedded Derivative Financial Instruments    
Investments, Debt and Equity Securities [Abstract]    
Other assets - embedded derivative, at fair value 0  
Level 1 | United States government obligations and authorities    
Investments, Debt and Equity Securities [Abstract]    
Fair value 41,125 38,511
Level 1 | Obligations of states and political subdivisions    
Investments, Debt and Equity Securities [Abstract]    
Fair value 0 0
Level 1 | Corporate securities    
Investments, Debt and Equity Securities [Abstract]    
Fair value 0 0
Level 1 | International securities    
Investments, Debt and Equity Securities [Abstract]    
Fair value 901 0
Level 2    
Investments, Debt and Equity Securities [Abstract]    
Fair value 285,506 449,699
Equity securities, at fair value 4,026 1,276
Total investments, at fair value 289,532 450,975
Level 2 | Embedded Derivative Financial Instruments    
Investments, Debt and Equity Securities [Abstract]    
Other assets - embedded derivative, at fair value 0  
Level 2 | United States government obligations and authorities    
Investments, Debt and Equity Securities [Abstract]    
Fair value 49,567 133,264
Level 2 | Obligations of states and political subdivisions    
Investments, Debt and Equity Securities [Abstract]    
Fair value 19,278 22,264
Level 2 | Corporate securities    
Investments, Debt and Equity Securities [Abstract]    
Fair value 188,980 266,528
Level 2 | International securities    
Investments, Debt and Equity Securities [Abstract]    
Fair value 27,681 27,643
Level 3    
Investments, Debt and Equity Securities [Abstract]    
Fair value 0 0
Equity securities, at fair value 0 0
Total investments, at fair value 0 0
Level 3 | Embedded Derivative Financial Instruments    
Investments, Debt and Equity Securities [Abstract]    
Other assets - embedded derivative, at fair value 10,725  
Level 3 | United States government obligations and authorities    
Investments, Debt and Equity Securities [Abstract]    
Fair value 0 0
Level 3 | Obligations of states and political subdivisions    
Investments, Debt and Equity Securities [Abstract]    
Fair value 0 0
Level 3 | Corporate securities    
Investments, Debt and Equity Securities [Abstract]    
Fair value 0 0
Level 3 | International securities    
Investments, Debt and Equity Securities [Abstract]    
Fair value $ 0 $ 0