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STOCKHOLDERS' EQUITY - Changes to Accumulated Other Comprehensive (Loss) Income by Components (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive (Loss) Income        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period $ (49,758) $ (34,059) $ (40,597) $ 7,743
Tax effect of current period changes (2,482) 5,494 1,163 22,478
Total changes, net of taxes 6,305 (13,520) (2,856) (55,322)
Balance at end of period (43,453) (47,579) (43,453) (47,579)
Gain (loss) on securities available-for-sale        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Unrealized gain (loss) arising during the period 2,205 (19,289) (10,652) (78,392)
Reclassification adjustment from other comprehensive income 0 0 0 (16)
Total unrealized gain (loss) on securities available-for-sale 2,205 (19,289) (10,652) (78,408)
Amortization of unrealized loss of available-for-sale securities transferred to held-to-maturity 254 275 759 608
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Unrealized gain arising during the period $ 6,328 $ 0 $ 5,874 $ 0