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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)

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