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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Reclassified of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at Beginning of Period $ 954,062 $ 1,182,435
Other comprehensive (loss) before reclassifications 22,101 (74,994)
Less: amounts reclassified from accumulated other comprehensive (loss) 115 0
Other comprehensive income (loss) 21,986 (74,994)
Balance at End of Period 995,480 1,093,861
Net unrealized holding (loss) on AFS securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at Beginning of Period (175,557) (1,398)
Other comprehensive (loss) before reclassifications 17,744 (74,994)
Less: amounts reclassified from accumulated other comprehensive (loss) 0 0
Other comprehensive income (loss) 17,744 (74,994)
Balance at End of Period (157,813) (76,392)
Net unrealized (loss) on cash flow hedging derivatives    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at Beginning of Period (4,878) (1,845)
Other comprehensive (loss) before reclassifications 4,357 0
Less: amounts reclassified from accumulated other comprehensive (loss) 115 0
Other comprehensive income (loss) 4,242 0
Balance at End of Period (636) (1,845)
Net unrealized holding loss on pension plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at Beginning of Period (617) 0
Other comprehensive (loss) before reclassifications 0 0
Less: amounts reclassified from accumulated other comprehensive (loss) 0 0
Other comprehensive income (loss) 0 0
Balance at End of Period (617) 0
Accumulated other comprehensive loss    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at Beginning of Period (181,052) (3,243)
Other comprehensive income (loss) 21,986 (74,994)
Balance at End of Period $ (159,066) $ (78,237)