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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 1,271,958 | $ 1,213,700 | $ 997,935
Other comprehensive income/(loss) before reclassifications | 26,888 | (53,936) | 20,716
Amounts reclassified from AOCI | (16,190) | (760) | (2,940)
Other comprehensive income/(loss) net of tax | 10,698 | (54,696) | 17,776
Ending balance | 1,411,863 | 1,271,958 | 1,213,700
Accumulated Other Comprehensive Income (Loss) |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (50,843) | 3,853 | (13,923)
Other comprehensive income/(loss) net of tax | 10,698 | (54,696) | 17,776
Ending balance | (40,145) | (50,843) | 3,853
AOCI, Securities | Available-for-Sale Securities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (115,561) | (6,932) | (13,937)
Other comprehensive income/(loss) before reclassifications | 47,114 | (108,624) | 9,114
Amounts reclassified from AOCI | 0 | (5) | (2,109)
Other comprehensive income/(loss) net of tax | 47,114 | (108,629) | 7,005
Ending balance | (68,447) | (115,561) | (6,932)
AOCI, Securities | Held-to-Maturity Securities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 16,357 | 16,153 | 22,829
Other comprehensive income/(loss) before reclassifications | (25,199) | 0 | 0
Amounts reclassified from AOCI | 118 | 204 | (6,676)
Other comprehensive income/(loss) net of tax | (25,081) | 204 | (6,676)
Ending balance | (8,724) | 16,357 | 16,153
AOCI, Cash Flow Hedge |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 48,361 | (5,368) | (22,815)
Other comprehensive income/(loss) before reclassifications | 4,973 | 54,688 | 11,602
Amounts reclassified from AOCI | (16,308) | (959) | 5,845
Other comprehensive income/(loss) net of tax | (11,335) | 53,729 | 17,447
Ending balance | $ 37,026 | $ 48,361 | $ (5,368)

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