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INVESTMENT SECURITIES (Investment Securities by Contractual Maturity - AFS) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Amortized Cost $ 1,663,633 $ 1,522,812
Gross Unrealized Gains 379 995
Gross Unrealized Losses 150,859 111,031
Fair Value $ 1,513,153 $ 1,412,776
Weighted Average Yield 3.65% 2.90%
Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,662,256 $ 1,210,834
Gross Unrealized Gains 379 965
Gross Unrealized Losses 150,856 109,298
Fair Value $ 1,511,779 $ 1,102,501
Weighted Average Yield 3.65% 2.79%
Mortgage-backed securities | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,261,401 $ 837,703
Gross Unrealized Gains 0 59
Gross Unrealized Losses 99,681 69,646
Fair Value $ 1,161,720 $ 768,116
Weighted Average Yield 3.82% 2.79%
Mortgage-backed securities | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 389,627 $ 357,497
Gross Unrealized Gains 379 906
Gross Unrealized Losses 50,622 38,869
Fair Value $ 339,384 $ 319,534
Weighted Average Yield 3.15% 2.80%
Mortgage-backed securities | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 11,228 $ 15,634
Gross Unrealized Gains 0 0
Gross Unrealized Losses 553 783
Fair Value $ 10,675 $ 14,851
Weighted Average Yield 2.04% 1.99%
Mortgage-backed securities | Due from 1 to 5 years | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 7,717 $ 10,155
Gross Unrealized Gains 0 0
Gross Unrealized Losses 430 550
Fair Value $ 7,287 $ 9,605
Weighted Average Yield 1.76% 1.76%
Mortgage-backed securities | Due from 1 to 5 years | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 10,143 $ 12,505
Gross Unrealized Gains 0 0
Gross Unrealized Losses 585 632
Fair Value $ 9,558 $ 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 $ 10,199 $ 14,190
Gross Unrealized Gains 0 0
Gross Unrealized Losses 530 755
Fair Value $ 9,669 $ 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 $ 48,962 $ 59,167
Gross Unrealized Gains 0 0
Gross Unrealized Losses 4,373 3,764
Fair Value $ 44,589 $ 55,403
Weighted Average Yield 2.00% 2.00%
Mortgage-backed securities | Due from 5 to 10 years | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 18,234 $ 24,575
Gross Unrealized Gains 4 14
Gross Unrealized Losses 1,490 1,585
Fair Value $ 16,748 $ 23,004
Weighted Average Yield 2.18% 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 $ 147 $ 485
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2 10
Fair Value $ 145 $ 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 $ 1,204,722 $ 768,381
Gross Unrealized Gains 0 59
Gross Unrealized Losses 94,878 65,332
Fair Value $ 1,109,844 $ 703,108
Weighted Average Yield 3.91% 2.87%
Mortgage-backed securities | Due after 10 years | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 361,250 $ 320,417
Gross Unrealized Gains 375 892
Gross Unrealized Losses 48,547 36,652
Fair Value $ 313,078 $ 284,657
Weighted Average Yield 3.23% 2.90%
Mortgage-backed securities | Due after 10 years | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 882 $ 959
Gross Unrealized Gains 0 0
Gross Unrealized Losses 21 18
Fair Value $ 861 $ 941
Weighted Average Yield 5.07% 5.06%
Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,377 $ 311,978
Gross Unrealized Gains 0 30
Gross Unrealized Losses 3 1,733
Fair Value $ 1,374 $ 310,275
Weighted Average Yield 4.40% 3.35%
Investment securities | Due less than 1 year | US Treasury securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 739 $ 310,862
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 1,729
Fair Value $ 739 $ 309,133
Weighted Average Yield 5.45% 3.34%
Investment securities | Due from 1 to 5 years | Other debt securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 638 $ 1,116
Gross Unrealized Gains 0 30
Gross Unrealized Losses 3 4
Fair Value $ 635 $ 1,142
Weighted Average Yield 3.19% 4.45%