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INVESTMENT SECURITIES (Investment Securities by Contractual Maturity - AFS) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Amortized Cost $ 2,177,761 $ 1,522,812
Gross Unrealized Gains 13,476 995
Gross Unrealized Losses 91,973 111,031
Fair Value $ 2,099,264 $ 1,412,776
Weighted Average Yield 4.07% 2.90%
Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,880,395 $ 1,210,834
Gross Unrealized Gains 13,424 965
Gross Unrealized Losses 91,970 109,298
Fair Value $ 1,801,849 $ 1,102,501
Weighted Average Yield 3.86% 2.79%
Mortgage-backed securities | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,464,134 $ 837,703
Gross Unrealized Gains 8,989 59
Gross Unrealized Losses 57,178 69,646
Fair Value $ 1,415,945 $ 768,116
Weighted Average Yield 4.03% 2.79%
Mortgage-backed securities | GNMA certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 406,275 $ 357,497
Gross Unrealized Gains 4,435 906
Gross Unrealized Losses 34,416 38,869
Fair Value $ 376,294 $ 319,534
Weighted Average Yield 3.30% 2.80%
Mortgage-backed securities | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 9,986 $ 15,634
Gross Unrealized Gains 0 0
Gross Unrealized Losses 376 783
Fair Value $ 9,610 $ 14,851
Weighted Average Yield 2.06% 1.99%
Mortgage-backed securities | Due less than 1 year | GNMA certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 5  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value $ 5  
Weighted Average Yield 1.31%  
Mortgage-backed securities | Due from 1 to 5 years | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 6,972 $ 10,155
Gross Unrealized Gains 0 0
Gross Unrealized Losses 311 550
Fair Value $ 6,661 $ 9,605
Weighted Average Yield 1.76% 1.76%
Mortgage-backed securities | Due from 1 to 5 years | GNMA certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 8,851 $ 12,505
Gross Unrealized Gains 0 0
Gross Unrealized Losses 351 632
Fair Value $ 8,500 $ 11,873
Weighted Average Yield 1.71% 1.66%
Mortgage-backed securities | Due from 1 to 5 years | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 9,071 $ 14,190
Gross Unrealized Gains 0 0
Gross Unrealized Losses 364 755
Fair Value $ 8,707 $ 13,435
Weighted Average Yield 1.78% 1.78%
Mortgage-backed securities | Due from 5 to 10 years | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 45,835 $ 59,167
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2,767 3,764
Fair Value $ 43,068 $ 55,403
Weighted Average Yield 2.00% 2.00%
Mortgage-backed securities | Due from 5 to 10 years | GNMA certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 17,113 $ 24,575
Gross Unrealized Gains 16 14
Gross Unrealized Losses 955 1,585
Fair Value $ 16,174 $ 23,004
Weighted Average Yield 2.19% 2.13%
Mortgage-backed securities | Due from 5 to 10 years | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 54 $ 485
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 10
Fair Value $ 54 $ 475
Weighted Average Yield 2.14% 2.14%
Mortgage-backed securities | Due after 10 years | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,411,327 $ 768,381
Gross Unrealized Gains 8,989 59
Gross Unrealized Losses 54,100 65,332
Fair Value $ 1,366,216 $ 703,108
Weighted Average Yield 4.11% 2.87%
Mortgage-backed securities | Due after 10 years | GNMA certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 380,306 $ 320,417
Gross Unrealized Gains 4,419 892
Gross Unrealized Losses 33,110 36,652
Fair Value $ 351,615 $ 284,657
Weighted Average Yield 3.38% 2.90%
Mortgage-backed securities | Due after 10 years | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 861 $ 959
Gross Unrealized Gains 0 0
Gross Unrealized Losses 12 18
Fair Value $ 849 $ 941
Weighted Average Yield 5.07% 5.06%
Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 297,366 $ 311,978
Gross Unrealized Gains 52 30
Gross Unrealized Losses 3 1,733
Fair Value $ 297,415 $ 310,275
Weighted Average Yield 5.39% 3.35%
Investment securities | Due less than 1 year | US Treasury securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 296,747 $ 310,862
Gross Unrealized Gains 52 0
Gross Unrealized Losses 0 1,729
Fair Value $ 296,799 $ 309,133
Weighted Average Yield 5.40% 3.34%
Investment securities | Due less than 1 year | Other debt securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 500  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value $ 500  
Weighted Average Yield 3.25%  
Investment securities | Due from 1 to 5 years | Other debt securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 119 $ 1,116
Gross Unrealized Gains 0 30
Gross Unrealized Losses 3 4
Fair Value $ 116 $ 1,142
Weighted Average Yield 2.97% 4.45%