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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCI (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total shareholders’ equity $ 995,480 $ 954,062 $ 1,093,861 $ 1,182,435
Accumulated other comprehensive loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total shareholders’ equity (159,066) (181,052) (78,237) (3,243)
Net unrealized holding (loss) on AFS securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other accumulated comprehensive income, before tax (212,919) (236,887)    
Income taxes related to items of accumulated other comprehensive income 55,105 61,329    
Total shareholders’ equity (157,813) (175,557) (76,392) (1,398)
Net unrealized (loss) on cash flow hedging derivatives        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other accumulated comprehensive income, before tax (869) (6,667)    
Income taxes related to items of accumulated other comprehensive income 233 1,789    
Total shareholders’ equity (636) (4,878) (1,845) (1,845)
Net unrealized holding (loss) on pension plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other accumulated comprehensive income, before tax (844) (844)    
Income taxes related to items of accumulated other comprehensive income 228 228    
Total shareholders’ equity $ (617) $ (617) $ 0 $ 0