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ACCUMULATED OTHER COMPREHENSIVE INCOME - Reclassifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest income | $ 62,558 | $ 49,295 | $ 164,214 | $ 144,897
Net securities gains | 0 | 0 | 0 | 797
Income tax expense | 6,237 | 5,469 | 16,360 | 16,204
Other expense | 3,724 | 2,694 | 10,262 | 6,842
Net income | 28,525 | 24,119 | 77,840 | 71,450
Amount Reclassified From Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income | (425) | (46) | (867) | 494
Amount Reclassified From Accumulated Other Comprehensive Income | Held-to-Maturity Securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest income | (504) |  | (995) |
Income tax expense | 106 |  | 209 |
Net income | (398) |  | (786) |
Amount Reclassified From Accumulated Other Comprehensive Income | Available-for-Sale Securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net securities gains |  | 0 |  | 797
Income tax expense |  | 0 |  | (167)
Net income |  | 0 |  | 630
Amount Reclassified From Accumulated Other Comprehensive Income | Defined Benefit Pension Items |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax expense | 9 | 15 | 27 | 45
Other expense | (36) | (61) | (108) | (181)
Net income | $ (27) | $ (46) | $ (81) | $ (136)

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