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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