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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Changes in Accumulated Other Comprehensive Earnings (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
COMPREHENSIVE EARNINGS          
Tax rate used (as a percent) 21.00% 35.00% 21.00% 35.00%  
Changes in the balance of each component of accumulated other comprehensive earnings          
Beginning balance     $ 157,919    
Net current-period other comprehensive earnings (loss) $ (7,675) $ 10,599 (34,073) $ 22,368  
Ending balance (14,648)   (14,648)   $ 157,919
Reclassification Adjustment Out of Accumulated Other Comprehensive Income Abstract          
Net realized gains (losses) 20,849 (1,359) 29,309 1,355  
Earnings before income taxes 39,562 34,036 53,940 60,479  
Income tax expense (6,311) (7,828) (8,473) (14,443)  
Net earnings 33,251 26,208 45,467 46,036  
Unrealized Gains and Losses on Available-for-Sale Securities          
Changes in the balance of each component of accumulated other comprehensive earnings          
Beginning balance (6,973) 134,379 157,919 122,610 122,610
Cumulative effect adjustment of ASU 2016-01 (142,219)   (142,219)    
Accumulated Other Comprehensive Income Loss Net Of Tax Adjusted Balance (6,973) 134,379 15,700 122,610 122,610
Other comprehensive earnings before reclassifications (8,385) 11,753 (34,795) 23,925  
Amounts reclassified from accumulated other comprehensive earnings 710 (1,154) 722 (1,557)  
Net current-period other comprehensive earnings (loss) (7,675) 10,599 (34,073) 22,368  
Tax Cuts And Jobs Act Of 2017 Reclassification From Aoci To Retained Earnings Tax Effect     3,725    
Ending balance (14,648) 144,978 (14,648) 144,978 $ 157,919
Reclassifications out of accumulated other comprehensive earnings | Unrealized Gains and Losses on Available-for-Sale Securities          
Reclassification Adjustment Out of Accumulated Other Comprehensive Income Abstract          
Net realized gains (losses) (899) 1,775 (858) 4,485  
Other-than-temporary impairment (OTTI) losses on investments     (56) (2,090)  
Earnings before income taxes (899) 1,775 (914) 2,395  
Income tax expense 189 (621) 192 (838)  
Net earnings $ (710) $ 1,154 $ (722) $ 1,557