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SHAREHOLDERS’ EQUITY - Changes in Accumulated Other Comprehensive Income After-tax By Component (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 1,592,820 | $ 1,473,177 | $ 1,522,263 | $ 1,529,116
Ending balance | 1,618,233 | 1,447,412 | 1,618,233 | 1,447,412
Total |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (105,975) | (59,260) | (130,332) | 18,777
Net change | (17,490) | (49,221) | 6,867 | (127,258)
Transfer from available-for-sale to held-to-maturity |  |  |  | 0
Ending balance | (123,465) | (108,481) | (123,465) | (108,481)
Net Unrealized Gain (Loss) on Available-for-Sale Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (120,856) | (74,279) | (144,549) | 5,271
Net change | (13,677) | (49,242) | 10,016 | (128,595)
Transfer from available-for-sale to held-to-maturity |  |  |  | (197)
Ending balance | (134,533) | (123,521) | (134,533) | (123,521)
Unamortized Gain (Loss) on Held-to-Maturity Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 12,547 | 15,177 | 13,185 | 15,684
Net change | (686) | (701) | (1,324) | (1,405)
Transfer from available-for-sale to held-to-maturity |  |  |  | 197
Ending balance | 11,861 | 14,476 | 11,861 | 14,476
Net Unrealized Gain (Loss) on Cash Flow Hedges |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 2,334 | (158) | 1,032 | (2,178)
Net change | (3,127) | 722 | (1,825) | 2,742
Transfer from available-for-sale to held-to-maturity |  |  |  | 0
Ending balance | $ (793) | $ 564 | $ (793) | $ 564

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- Definition Amount of gain (loss) in accumulated other comprehensive income (AOCI) of derivative hedging forecasted acquisition of investment in debt security measured at amortized cost (held-to-maturity), transferred to investment in debt security measured at fair value with changes in fair value recognized in other comprehensive income (available-for-sale) and net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-10 + Details
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