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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCI (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total shareholders’ equity $ 1,070,451 $ 1,012,942 $ 1,012,221 $ 951,009 $ 973,381 $ 954,062
Accumulated other comprehensive loss            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total shareholders’ equity (89,257) (114,698) (143,016) (218,386) (186,240) (181,052)
Net unrealized holding (loss) on AFS securities            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other accumulated comprehensive income, before tax: (120,206)   (188,927)      
Income taxes related to items of accumulated other comprehensive income: 31,345   49,401      
Total shareholders’ equity (88,861) (107,495) (139,526) (206,255) (176,274) (175,558)
Net unrealized (loss) on cash flow hedging derivatives            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other accumulated comprehensive income, before tax: (16)   (4,265)      
Income taxes related to items of accumulated other comprehensive income: 4   1,159      
Total shareholders’ equity (12) (6,819) (3,106) (11,515) (9,350) (4,878)
Net unrealized holding (loss) on pension plans            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other accumulated comprehensive income, before tax: (528)   (528)      
Income taxes related to items of accumulated other comprehensive income: 144   144      
Total shareholders’ equity $ (384) $ (384) $ (384) $ (616) $ (616) $ (616)