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INVESTMENT SECURITIES (Investment Securities by Contractual Maturity - HTM) (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 338,621 | $ 549,024
Gross Unrealized Gains | 72 | 55
Gross Unrealized Losses | 59,256 | 58,315
Fair Value | $ 279,437 | $ 490,764
Weighted Average Yield | 2.20% | 2.60%
Fair Value | $ 2,096,306 | $ 2,099,264
Mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair Value | 1,895,067 | 1,801,849
Mortgage-backed securities | FNMA and FHLMC certificates |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair Value | 1,491,161 | 1,415,945
Investment securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair Value | 201,239 | 297,415
Investment securities | Other debt securities available for sale |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair Value | 581 | 616
Due from 1 to 5 years | Mortgage-backed securities | FNMA and FHLMC certificates |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair Value | 8,512 | 6,661
Due from 1 to 5 years | Investment securities | Other debt securities available for sale |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 35,000 | 35,000
Gross Unrealized Gains | 72 | 55
Gross Unrealized Losses | 0 | 0
Fair Value | $ 35,072 | $ 35,055
Weighted Average Yield | 6.33% | 6.36%
Fair Value | $ 81 | $ 116
Due less than 1 year | Investment securities | US Treasury securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost |  | 199,314
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 1,548
Fair Value |  | $ 197,766
Weighted Average Yield |  | 3.33%
Fair Value | 200,658 | $ 296,799
Due less than 1 year | Investment securities | Other debt securities available for sale |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair Value | 500 | 500
Due after 10 years | Mortgage-backed securities | FNMA and FHLMC certificates |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 303,621 | 314,710
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 59,256 | 56,767
Fair Value | $ 244,365 | $ 257,943
Weighted Average Yield | 1.72% | 1.72%
Fair Value | $ 1,448,424 | $ 1,366,216

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