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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCIL (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
CAPITAL RATIOS AND SHAREHOLDERS' EQUITY        
Total shareholders' equity $ 537,937 $ 532,541 $ 467,311 $ 458,428
Accumulated other comprehensive income (loss)        
CAPITAL RATIOS AND SHAREHOLDERS' EQUITY        
Total shareholders' equity (38,686) (35,409) (48,824) (51,536)
Net unrealized gain (loss) on AFS securities        
CAPITAL RATIOS AND SHAREHOLDERS' EQUITY        
Accumulated other comprehensive loss, before tax (45,704) (41,705)    
Income taxes related to items of accumulated other comprehensive loss 11,124 10,107    
Total shareholders' equity (34,580) (31,598) (43,559) (47,741)
Net unrealized gain (loss) on hedging derivatives        
CAPITAL RATIOS AND SHAREHOLDERS' EQUITY        
Accumulated other comprehensive loss, before tax (4,196) (3,785)    
Income taxes related to items of accumulated other comprehensive loss 1,020 904    
Total shareholders' equity (3,176) (2,881) (4,052) (2,582)
Net unrealized gain (loss) on post-retirement plans        
CAPITAL RATIOS AND SHAREHOLDERS' EQUITY        
Accumulated other comprehensive loss, before tax (1,288) (1,288)    
Income taxes related to items of accumulated other comprehensive loss 358 358    
Total shareholders' equity $ (930) $ (930) $ (1,213) $ (1,213)