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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of changes in AOCI by component (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 1,319,112 | $ 1,270,069 | $ 1,220,434
Unrealized/Unrecognized gains (losses) on debt securities |  |  |
Unrealized holding gains (losses) on debt securities available for sale, net of tax | (199,302) | (58,610) | 21,561
Unrealized losses on debt securities transferred to held to maturity from available for sale, net of tax | (34,644) | 0 | 0
Amounts reclassified from AOCI, net of tax | 19 | (44) | 1,228
Amortization of unrealized losses on securities transferred to held to maturity, net of tax | (4,745) | 0 | 0
Unrealized gains (losses) on cash flow hedges: |  |  |
Unrealized holding gains (losses) on cash flow hedges, net of tax | (20,717) | 736 | (2,526)
Amounts reclassified from AOCI, net of tax | (417) | (763) | (542)
Ending balance | 1,145,977 | 1,319,112 | 1,270,069
AOCI |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Accumulated other comprehensive income (loss) beginning balance period, before tax | (33,230) | 46,589 |
Accumulated other comprehensive income (loss) beginning balance period, tax effect | 9,472 | (13,280) |
Beginning balance | (23,758) | 33,309 | 14,960
Unrealized gains (losses) on cash flow hedges: |  |  |
Accumulated other comprehensive income (loss) ending balance period, before tax | (382,228) | (33,230) | 46,589
Accumulated other comprehensive income (loss) ending balance period, tax effect | 108,950 | 9,472 | (13,280)
Ending balance | (273,278) | (23,758) | 33,309
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Accumulated other comprehensive income (loss) beginning balance period, before tax | (32,272) | 49,644 | 21,192
Accumulated other comprehensive income (loss) beginning balance period, tax effect | 9,199 | (14,151) | (6,032)
Beginning balance | (23,073) | 35,493 | 15,160
Unrealized/Unrecognized gains (losses) on debt securities |  |  |
Unrealized holding gains (losses) on debt securities available for sale, before tax | (278,762) | (81,977) | 30,176
Unrealized holding gains (losses) on debt securities available for sale, tax effect | 79,460 | 23,367 | (8,615)
Unrealized holding gains (losses) on debt securities available for sale, net of tax | (199,302) | (58,610) | 21,561
Unrealized gains on debt securities transferred from held to maturity to available for sale, before tax | (48,456) |  |
Unrealized losses on debt securities transferred to held to maturity from available for sale, tax effect | 13,812 | 0 | 0
Unrealized losses on debt securities transferred to held to maturity from available for sale, net of tax | (34,644) |  |
Amounts reclassified from AOCI, before tax | (26) | 61 | (1,724)
Amounts reclassified from AOCI, tax effect | 7 | (17) | 496
Amounts reclassified from AOCI, net of tax | (19) | 44 | (1,228)
Amortization of unrealized losses on securities transferred to held to maturity, before tax | 6,638 |  |
Amortization of unrealized losses on securities transferred to held to maturity, tax effect | (1,893) | 0 | 0
Amortization of unrealized losses on securities transferred to held to maturity, net of tax | 4,745 |  |
Unrealized gains (losses) on cash flow hedges: |  |  |
Accumulated other comprehensive income (loss) ending balance period, before tax | (352,878) | (32,272) | 49,644
Accumulated other comprehensive income (loss) ending balance period, tax effect | 100,585 | 9,199 | (14,151)
Ending balance | (252,293) | (23,073) | 35,493
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Accumulated other comprehensive income (loss) beginning balance period, before tax | (958) | (3,055) | (280)
Accumulated other comprehensive income (loss) beginning balance period, tax effect | 273 | 871 | 80
Beginning balance | (685) | (2,184) | (200)
Unrealized gains (losses) on cash flow hedges: |  |  |
Unrealized holding gains (losses) on cash flow hedges, before tax | (28,975) | 1,030 | (3,533)
Unrealized holding gains (losses) on cash flow hedges, tax effect | 8,258 | (294) | 1,007
Unrealized holding gains (losses) on cash flow hedges, net of tax | (20,717) | 736 | (2,526)
Amounts reclassified from AOCI, before tax | 583 | 1,067 | 758
Amounts reclassified from AOCI, tax effect | (166) | (304) | (216)
Amounts reclassified from AOCI, net of tax | 417 | 763 | 542
Accumulated other comprehensive income (loss) ending balance period, before tax | (29,350) | (958) | (3,055)
Accumulated other comprehensive income (loss) ending balance period, tax effect | 8,365 | 273 | 871
Ending balance | $ (20,985) | $ (685) | $ (2,184)

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- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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