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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCIL (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Jun. 30, 2026
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
CAPITAL RATIOS AND SHAREHOLDERS' EQUITY            
Total shareholders' equity $ 535,609 $ 549,552 $ 532,541 $ 520,955 $ 468,860 $ 458,428
Accumulated other comprehensive income (loss)            
CAPITAL RATIOS AND SHAREHOLDERS' EQUITY            
Total shareholders' equity (62,018) (37,056) (35,409) (40,025) (48,809) (51,536)
Net unrealized gain (loss) on AFS securities            
CAPITAL RATIOS AND SHAREHOLDERS' EQUITY            
Accumulated other comprehensive loss, before tax (72,865)   (41,705)      
Income taxes related to items of accumulated other comprehensive loss 17,735   10,107      
Total shareholders' equity (55,130) (34,028) (31,598) (35,331) (42,702) (47,741)
Net unrealized gain (loss) on hedging derivatives            
CAPITAL RATIOS AND SHAREHOLDERS' EQUITY            
Accumulated other comprehensive loss, before tax (8,015)   (3,785)      
Income taxes related to items of accumulated other comprehensive loss 1,948   904      
Total shareholders' equity (6,067) (2,098) (2,881) (3,481) (4,894) (2,582)
Net unrealized gain (loss) on post-retirement plans            
CAPITAL RATIOS AND SHAREHOLDERS' EQUITY            
Accumulated other comprehensive loss, before tax (1,147)   (1,288)      
Income taxes related to items of accumulated other comprehensive loss 326   358      
Total shareholders' equity $ (821) $ (930) $ (930) $ (1,213) $ (1,213) $ (1,213)