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INVESTMENT SECURITIES (Investment Securities by Contractual Maturity - AFS) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Amortized Cost $ 1,993,754 $ 2,177,761
Gross Unrealized Gains 10,704 13,476
Gross Unrealized Losses 106,751 91,973
Fair Value $ 1,897,707 $ 2,099,264
Weighted Average Yield 3.98% 4.07%
Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,842,240 $ 1,880,395
Gross Unrealized Gains 10,704 13,424
Gross Unrealized Losses 106,749 91,970
Fair Value $ 1,746,195 $ 1,801,849
Weighted Average Yield 3.87% 3.86%
Mortgage-backed securities | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,416,329 $ 1,464,134
Gross Unrealized Gains 5,322 8,989
Gross Unrealized Losses 68,097 57,178
Fair Value $ 1,353,554 $ 1,415,945
Weighted Average Yield 4.02% 4.03%
Mortgage-backed securities | GNMA certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 417,082 $ 406,275
Gross Unrealized Gains 5,382 4,435
Gross Unrealized Losses 38,293 34,416
Fair Value $ 384,171 $ 376,294
Weighted Average Yield 3.38% 3.30%
Mortgage-backed securities | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 8,829 $ 9,986
Gross Unrealized Gains 0 0
Gross Unrealized Losses 359 376
Fair Value $ 8,470 $ 9,610
Weighted Average Yield 2.09% 2.06%
Mortgage-backed securities | Due less than 1 year | GNMA certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 2 $ 5
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 2 $ 5
Weighted Average Yield 1.31% 1.31%
Mortgage-backed securities | Due from 1 to 5 years | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 7,060 $ 6,972
Gross Unrealized Gains 0 0
Gross Unrealized Losses 340 311
Fair Value $ 6,720 $ 6,661
Weighted Average Yield 1.82% 1.76%
Mortgage-backed securities | Due from 1 to 5 years | GNMA certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 9,253 $ 8,851
Gross Unrealized Gains 0 0
Gross Unrealized Losses 390 351
Fair Value $ 8,863 $ 8,500
Weighted Average Yield 1.72% 1.71%
Mortgage-backed securities | Due from 1 to 5 years | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 7,995 $ 9,071
Gross Unrealized Gains 0 0
Gross Unrealized Losses 345 364
Fair Value $ 7,650 $ 8,707
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 $ 42,231 $ 45,835
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2,864 2,767
Fair Value $ 39,367 $ 43,068
Weighted Average Yield 1.99% 2.00%
Mortgage-backed securities | Due from 5 to 10 years | GNMA certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 14,394 $ 17,113
Gross Unrealized Gains 9 16
Gross Unrealized Losses 942 955
Fair Value $ 13,461 $ 16,174
Weighted Average Yield 2.23% 2.19%
Mortgage-backed securities | Due from 5 to 10 years | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost   $ 54
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Fair Value   $ 54
Weighted Average Yield   2.14%
Mortgage-backed securities | Due after 10 years | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,367,038 $ 1,411,327
Gross Unrealized Gains 5,322 8,989
Gross Unrealized Losses 64,893 54,100
Fair Value $ 1,307,467 $ 1,366,216
Weighted Average Yield 4.10% 4.11%
Mortgage-backed securities | Due after 10 years | GNMA certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 393,433 $ 380,306
Gross Unrealized Gains 5,373 4,419
Gross Unrealized Losses 36,961 33,110
Fair Value $ 361,845 $ 351,615
Weighted Average Yield 3.46% 3.38%
Mortgage-backed securities | Due after 10 years | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 834 $ 861
Gross Unrealized Gains 0 0
Gross Unrealized Losses 14 12
Fair Value $ 820 $ 849
Weighted Average Yield 5.07% 5.07%
Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 151,514 $ 297,366
Gross Unrealized Gains 0 52
Gross Unrealized Losses 2 3
Fair Value $ 151,512 $ 297,415
Weighted Average Yield 5.35% 5.39%
Investment securities | Other debt securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 599  
Gross Unrealized Gains 0  
Gross Unrealized Losses 2  
Fair Value $ 597  
Weighted Average Yield 3.20%  
Investment securities | Due less than 1 year | US Treasury securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 150,915 $ 296,747
Gross Unrealized Gains 0 52
Gross Unrealized Losses 0 0
Fair Value $ 150,915 $ 296,799
Weighted Average Yield 5.36% 5.40%
Investment securities | Due less than 1 year | Other debt securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 500 $ 500
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 500 $ 500
Weighted Average Yield 3.25% 3.25%
Investment securities | Due from 1 to 5 years | Other debt securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 99 $ 119
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2 3
Fair Value $ 97 $ 116
Weighted Average Yield 2.97% 2.97%