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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | $ 1,500,979 | $ 1,480,343 | $ 1,411,863 | $ 1,346,555 | $ 1,292,385 | $ 1,271,958 | $ 1,411,863 | $ 1,271,958
Other comprehensive income/(loss) before reclassifications | 11,157 |  |  | 2,620 |  |  | 51,797 | 27,484
Amounts reclassified from AOCI | (4,570) |  |  | (4,108) |  |  | (14,206) | (12,480)
Other comprehensive income/(loss) net of tax | 6,587 | (5,023) | 36,027 | (1,488) | 25,511 | (9,019) | 37,591 | 15,004
Ending balance | 1,462,344 | 1,500,979 | 1,480,343 | 1,385,267 | 1,346,555 | 1,292,385 | 1,462,344 | 1,385,267
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | (9,141) | (4,118) | (40,145) | (34,351) | (59,862) | (50,843) | (40,145) | (50,843)
Other comprehensive income/(loss) net of tax | 6,587 | (5,023) | 36,027 | (1,488) | 25,511 | (9,019) | 37,591 | 15,004
Ending balance | (2,554) | (9,141) | (4,118) | (35,839) | (34,351) | (59,862) | (2,554) | (35,839)
AOCI, Securities | Available-for-Sale Securities |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | (41,062) |  | (68,447) | (96,607) |  | (115,561) | (68,447) | (115,561)
Other comprehensive income/(loss) before reclassifications | 20,820 |  |  | 17,443 |  |  | 49,042 | 36,406
Amounts reclassified from AOCI | (3) |  |  | (4) |  |  | (840) | (13)
Other comprehensive income/(loss) net of tax | 20,817 |  |  | 17,439 |  |  | 48,202 | 36,393
Ending balance | (20,245) | (41,062) |  | (79,168) | (96,607) |  | (20,245) | (79,168)
AOCI, Securities | Held-to-Maturity Securities |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | (8,972) |  | (8,724) | 15,486 |  | 16,357 | (8,724) | 16,357
Other comprehensive income/(loss) before reclassifications | 0 |  |  | (25,199) |  |  | 0 | (25,199)
Amounts reclassified from AOCI | (350) |  |  | 294 |  |  | (598) | (577)
Other comprehensive income/(loss) net of tax | (350) |  |  | (24,905) |  |  | (598) | (25,776)
Ending balance | (9,322) | (8,972) |  | (9,419) | 15,486 |  | (9,322) | (9,419)
AOCI, Cash Flow Hedge |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | 40,893 |  | $ 37,026 | 46,770 |  | $ 48,361 | 37,026 | 48,361
Other comprehensive income/(loss) before reclassifications | (9,663) |  |  | 10,376 |  |  | 2,755 | 16,277
Amounts reclassified from AOCI | (4,217) |  |  | (4,398) |  |  | (12,768) | (11,890)
Other comprehensive income/(loss) net of tax | (13,880) |  |  | 5,978 |  |  | (10,013) | 4,387
Ending balance | $ 27,013 | $ 40,893 |  | $ 52,748 | $ 46,770 |  | $ 27,013 | $ 52,748

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