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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2025 | Jun. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | $ 1,525,646 | $ 1,489,026 | $ 1,480,343 | $ 1,411,863 | $ 1,489,026 | $ 1,411,863
Other comprehensive (loss)/income before reclassifications | (13,121) |  | (180) |  | 482 | 40,641
Amounts reclassified from AOCI | (2,736) |  | (4,843) |  | (6,000) | (9,637)
Other comprehensive (loss)/income net of tax | (15,857) | 10,339 | (5,023) | 36,027 | (5,518) | 31,004
Ending balance | 1,544,307 | 1,525,646 | 1,500,979 | 1,480,343 | 1,544,307 | 1,500,979
Accumulated Other Comprehensive Loss |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (1,808) | (12,147) | (4,118) | (40,145) | (12,147) | (40,145)
Other comprehensive (loss)/income net of tax | (15,857) | 10,339 | (5,023) | 36,027 |  |
Ending balance | (17,665) | (1,808) | (9,141) | (4,118) | (17,665) | (9,141)
Available-for-Sale Securities |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (20,384) | (37,575) | (36,886) | (68,447) | (37,575) | (68,447)
Other comprehensive (loss)/income before reclassifications | (11,727) |  | (3,342) |  | 5,467 | 28,223
Amounts reclassified from AOCI | (2) |  | (834) |  | (5) | (838)
Other comprehensive (loss)/income net of tax | (11,729) |  | (4,176) |  | 5,462 | 27,385
Ending balance | (32,113) | (20,384) | (41,062) | (36,886) | (32,113) | (41,062)
Held-to-Maturity Securities |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (9,465) | (9,226) | (9,224) | (8,724) | (9,226) | (8,724)
Other comprehensive (loss)/income before reclassifications | 0 |  | 0 |  | 0 | 0
Amounts reclassified from AOCI | 225 |  | 252 |  | (14) | (248)
Other comprehensive (loss)/income net of tax | 225 |  | 252 |  | (14) | (248)
Ending balance | (9,240) | (9,465) | (8,972) | (9,224) | (9,240) | (8,972)
Cash Flow Hedges |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | 28,041 | 34,654 | 41,992 | 37,026 | 34,654 | 37,026
Other comprehensive (loss)/income before reclassifications | (1,394) |  | 3,162 |  | (4,985) | 12,418
Amounts reclassified from AOCI | (2,959) |  | (4,261) |  | (5,981) | (8,551)
Other comprehensive (loss)/income net of tax | (4,353) |  | (1,099) |  | (10,966) | 3,867
Ending balance | $ 23,688 | $ 28,041 | $ 40,893 | $ 41,992 | $ 23,688 | $ 40,893

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