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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Changes in AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax            
Beginning accumulated other comprehensive income     $ (58,340)   $ (58,340)  
Total other comprehensive loss $ (13,836) $ (21,618) 776 $ (43,274) (13,060) $ (64,892)
Ending accumulated other comprehensive income (71,400)       (71,400)  
Net unrealized gain (loss) on AFS securities:            
Accumulated Other Comprehensive Income (Loss), Net of Tax            
Beginning accumulated other comprehensive income (55,307) (38,304) (55,246) 1,985 (55,246) 1,985
Other comprehensive loss before reclassifications (11,223) (20,377)     (11,258) (60,659)
Less: amounts reclassified from accumulated other comprehensive income   34     26 41
Total other comprehensive loss (11,223) (20,411)     (11,284) (60,700)
Ending accumulated other comprehensive income (66,530) (58,715) (55,307) (38,304) (66,530) (58,715)
Net gain (loss) on effective cash flow hedging derivatives            
Accumulated Other Comprehensive Income (Loss), Net of Tax            
Beginning accumulated other comprehensive income (957) (2,115) (1,794) 870 (1,794) 870
Other comprehensive loss before reclassifications (2,613) (1,207)     (1,776) (4,192)
Total other comprehensive loss (2,613) (1,207)     (1,776) (4,192)
Ending accumulated other comprehensive income (3,570) (3,322) (957) (2,115) (3,570) (3,322)
Net unrealized loss on post-retirement plans            
Accumulated Other Comprehensive Income (Loss), Net of Tax            
Beginning accumulated other comprehensive income (1,300) (552) (1,300) (552) (1,300) (552)
Ending accumulated other comprehensive income (1,300) (552) (1,300) (552) (1,300) (552)
Accumulated other comprehensive income (loss)            
Accumulated Other Comprehensive Income (Loss), Net of Tax            
Beginning accumulated other comprehensive income (57,564) (40,971) (58,340) 2,303 (58,340) 2,303
Other comprehensive loss before reclassifications (13,836) (21,584)     (13,034) (64,851)
Less: amounts reclassified from accumulated other comprehensive income   34     26 41
Total other comprehensive loss (13,836) (21,618) 776 (43,274) (13,060) (64,892)
Ending accumulated other comprehensive income $ (71,400) $ (62,589) $ (57,564) $ (40,971) $ (71,400) $ (62,589)