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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Changes in AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax    
Beginning accumulated other comprehensive income $ (58,340)  
Total other comprehensive income (loss) 5,189 $ (23,658)
Ending accumulated other comprehensive income (53,151)  
Net unrealized gain on AFS securities:    
Accumulated Other Comprehensive Income (Loss), Net of Tax    
Beginning accumulated other comprehensive income (55,246) 1,985
Other comprehensive (loss) gain before reclassifications 4,626 (22,203)
Less: amounts reclassified from accumulated other comprehensive income 26 7
Total other comprehensive income (loss) 4,600 (22,210)
Ending accumulated other comprehensive income (50,646) (20,225)
Net unrealized gain arising during the period    
Accumulated Other Comprehensive Income (Loss), Net of Tax    
Beginning accumulated other comprehensive income (1,794) 870
Other comprehensive (loss) gain before reclassifications 589 (1,448)
Less: amounts reclassified from accumulated other comprehensive income 0 0
Total other comprehensive income (loss) 589 (1,448)
Ending accumulated other comprehensive income (1,205) (578)
Net unrealized loss on post-retirement plans    
Accumulated Other Comprehensive Income (Loss), Net of Tax    
Beginning accumulated other comprehensive income (1,300) (552)
Other comprehensive (loss) gain before reclassifications 0 0
Less: amounts reclassified from accumulated other comprehensive income 0 0
Total other comprehensive income (loss) 0 0
Ending accumulated other comprehensive income (1,300) (552)
Accumulated other comprehensive income (loss)    
Accumulated Other Comprehensive Income (Loss), Net of Tax    
Beginning accumulated other comprehensive income (58,340) 2,303
Other comprehensive (loss) gain before reclassifications 5,215 (23,651)
Less: amounts reclassified from accumulated other comprehensive income 26 7
Total other comprehensive income (loss) 5,189 (23,658)
Ending accumulated other comprehensive income $ (53,151) $ (21,355)