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INVESTMENTS - (Summary of Amortized Cost and Fair Value of Debt and Equity Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt securities - available-for-sale:    
Amortized Cost or Cost $ 473,126 $ 512,645
Fair value 488,210 526,265
Debt securities - held-to-maturity:    
Amortized Cost or Cost 0 4,337
Fair Value 4,300  
Total investments, excluding equity securities    
Total investments, amortized cost   516,982
Investments, accumulated unrealized gain   14,245
Investments, accumulated unrealized loss   631
Fair value   530,596
United States government obligations and authorities    
Debt securities - available-for-sale:    
Amortized Cost or Cost 169,947 191,546
Gross Unrealized Gains 1,866 3,073
Gross Unrealized Losses 38 426
Fair value 171,775 194,193
Debt securities - held-to-maturity:    
Amortized Cost or Cost   3,585
Gross Unrealized Gains   12
Gross Unrealized Losses   39
Fair Value   3,558
Obligations of states and political subdivisions    
Debt securities - available-for-sale:    
Amortized Cost or Cost 21,560 23,748
Gross Unrealized Gains 704 294
Gross Unrealized Losses 0 22
Fair value 22,264 24,020
Corporate securities    
Debt securities - available-for-sale:    
Amortized Cost or Cost 254,618 268,182
Gross Unrealized Gains 11,989 10,252
Gross Unrealized Losses 79 132
Fair value 266,528 278,302
Debt securities - held-to-maturity:    
Amortized Cost or Cost   697
Gross Unrealized Gains   20
Gross Unrealized Losses   0
Fair Value   717
International securities    
Debt securities - available-for-sale:    
Amortized Cost or Cost 27,001 29,169
Gross Unrealized Gains 659 593
Gross Unrealized Losses 17 12
Fair value 27,643 29,750
Debt securities - held-to-maturity:    
Amortized Cost or Cost   55
Gross Unrealized Gains   1
Gross Unrealized Losses   0
Fair Value   56
Debt securities    
Debt securities - available-for-sale:    
Amortized Cost or Cost 473,126 512,645
Gross Unrealized Gains 15,218 14,212
Gross Unrealized Losses 134 592
Fair value $ 488,210 526,265
Debt securities - held-to-maturity:    
Amortized Cost or Cost   4,337
Gross Unrealized Gains   33
Gross Unrealized Losses   39
Fair Value   $ 4,331