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ACCUMULATED OTHER COMPREHENSIVE INCOME - Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ 568,887 $ 704,906
Net current period other comprehensive (loss) income 21,553 (109,780)
Ending balance 602,006 609,102
Total    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (188,923) 16,093
Other comprehensive income (loss) before reclassification 21,167 (109,807)
Amounts reclassified from accumulated other comprehensive income (loss) 386 27
Net current period other comprehensive (loss) income 21,553 (109,780)
Ending balance (167,370) (93,687)
Unrealized Gains and Losses on Available- for-Sales Securities    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (188,154) 17,056
Other comprehensive income (loss) before reclassification 21,167 (109,807)
Amounts reclassified from accumulated other comprehensive income (loss) 375 0
Net current period other comprehensive (loss) income 21,542 (109,807)
Ending balance (166,612) (92,751)
Defined Benefit Pension Items    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (769) (963)
Other comprehensive income (loss) before reclassification 0 0
Amounts reclassified from accumulated other comprehensive income (loss) 11 27
Net current period other comprehensive (loss) income 11 27
Ending balance $ (758) $ (936)