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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Reclassification out of Accumulated Other Comprehensive Income (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
Other comprehensive income/(loss): |  |  |  |  |  |  |  |
Other comprehensive income/(loss) before tax | $ 8,338 |  |  | $ (1,883) |  |  | $ 47,583 | $ 18,993
Provision (Benefit) |  |  |  |  |  |  |  |
Other comprehensive income/(loss), provision (benefit) | 1,751 |  |  | (395) |  |  | 9,992 | 3,989
After Tax |  |  |  |  |  |  |  |
Unrealized (losses) / gain, after tax | 11,157 |  |  | 2,620 |  |  | 51,797 | 27,484
Less reclassification adjustments, provision (benefit) | (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
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
Other comprehensive income/(loss): |  |  |  |  |  |  |  |
Other comprehensive income/(loss) before tax | 8,338 |  |  | (1,883) |  |  | 47,583 | 18,993
Provision (Benefit) |  |  |  |  |  |  |  |
Other comprehensive income/(loss), provision (benefit) | 1,751 |  |  | (395) |  |  | 9,992 | 3,989
After Tax |  |  |  |  |  |  |  |
Other comprehensive income/(loss) net of tax | 6,587 | $ (5,023) | $ 36,027 | (1,488) | $ 25,511 | $ (9,019) | 37,591 | 15,004
Securities | Available-for-Sale Securities |  |  |  |  |  |  |  |
Other comprehensive income/(loss): |  |  |  |  |  |  |  |
Unrealized (losses) / gain, before tax | 26,354 |  |  | 22,081 |  |  | 62,079 | 46,084
Other comprehensive income/(loss) before tax | 26,350 |  |  | 22,076 |  |  | 61,015 | 46,068
Provision (Benefit) |  |  |  |  |  |  |  |
Unrealized (losses) / gain, provision (benefit) | 5,534 |  |  | 4,638 |  |  | 13,037 | 9,678
Other comprehensive income/(loss), provision (benefit) | 5,533 |  |  | 4,637 |  |  | 12,813 | 9,675
After Tax |  |  |  |  |  |  |  |
Unrealized (losses) / gain, after tax | 20,820 |  |  | 17,443 |  |  | 49,042 | 36,406
Other comprehensive income/(loss) net of tax | 20,817 |  |  | 17,439 |  |  | 48,202 | 36,393
Securities | Held-to-Maturity Securities |  |  |  |  |  |  |  |
Other comprehensive income/(loss): |  |  |  |  |  |  |  |
Unrealized (losses) / gain, before tax | 0 |  |  | (31,898) |  |  | 0 | (31,898)
Less reclassification adjustments, before tax | (443) |  |  | 373 |  |  | (757) | (730)
Other comprehensive income/(loss) before tax | (443) |  |  | (31,525) |  |  | (757) | (32,628)
Provision (Benefit) |  |  |  |  |  |  |  |
Unrealized (losses) / gain, provision (benefit) | 0 |  |  | (6,699) |  |  | 0 | (6,699)
Less reclassification adjustments, provision (benefit) | (93) |  |  | 79 |  |  | (159) | (153)
Other comprehensive income/(loss), provision (benefit) | (93) |  |  | (6,620) |  |  | (159) | (6,852)
After Tax |  |  |  |  |  |  |  |
Unrealized (losses) / gain, after tax | 0 |  |  | (25,199) |  |  | 0 | (25,199)
Less reclassification adjustments, provision (benefit) | (350) |  |  | 294 |  |  | (598) | (577)
Other comprehensive income/(loss) net of tax | (350) |  |  | (24,905) |  |  | (598) | (25,776)
Securities | Gain on sale of available-for sale investment securities | Available-for-Sale Securities |  |  |  |  |  |  |  |
Other comprehensive income/(loss): |  |  |  |  |  |  |  |
Less reclassification adjustments, before tax | 0 |  |  | 0 |  |  | (1,052) | 0
Provision (Benefit) |  |  |  |  |  |  |  |
Less reclassification adjustments, provision (benefit) | 0 |  |  | 0 |  |  | (221) | 0
After Tax |  |  |  |  |  |  |  |
Less reclassification adjustments, provision (benefit) | 0 |  |  | 0 |  |  | (831) | 0
Securities | Other income | Available-for-Sale Securities |  |  |  |  |  |  |  |
Other comprehensive income/(loss): |  |  |  |  |  |  |  |
Less reclassification adjustments, before tax | (4) |  |  | (5) |  |  | (12) | (16)
Provision (Benefit) |  |  |  |  |  |  |  |
Less reclassification adjustments, provision (benefit) | (1) |  |  | (1) |  |  | (3) | (3)
After Tax |  |  |  |  |  |  |  |
Less reclassification adjustments, provision (benefit) | (3) |  |  | (4) |  |  | (9) | (13)
Cash Flow Hedges |  |  |  |  |  |  |  |
Other comprehensive income/(loss): |  |  |  |  |  |  |  |
Unrealized (losses) / gain, before tax | (12,232) |  |  | 13,135 |  |  | 3,488 | 20,604
Less reclassification adjustments, before tax | (5,337) |  |  | (5,569) |  |  | (16,163) | (15,051)
Other comprehensive income/(loss) before tax | (17,569) |  |  | 7,566 |  |  | (12,675) | 5,553
Provision (Benefit) |  |  |  |  |  |  |  |
Unrealized (losses) / gain, provision (benefit) | (2,569) |  |  | 2,759 |  |  | 733 | 4,327
Less reclassification adjustments, provision (benefit) | (1,120) |  |  | (1,171) |  |  | (3,395) | (3,161)
Other comprehensive income/(loss), provision (benefit) | (3,689) |  |  | 1,588 |  |  | (2,662) | 1,166
After Tax |  |  |  |  |  |  |  |
Unrealized (losses) / gain, after tax | (9,663) |  |  | 10,376 |  |  | 2,755 | 16,277
Less reclassification adjustments, provision (benefit) | (4,217) |  |  | (4,398) |  |  | (12,768) | (11,890)
Other comprehensive income/(loss) net of tax | $ (13,880) |  |  | $ 5,978 |  |  | $ (10,013) | $ 4,387

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