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INVESTMENT SECURITIES (Investment Securities by Contractual Maturity - AFS) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Amortized Cost $ 1,247,149 $ 1,522,812
Gross Unrealized Gains 1,724 995
Gross Unrealized Losses 107,028 111,031
Fair Value $ 1,141,845 $ 1,412,776
Weighted Average Yield 2.97% 2.90%
Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,245,340 $ 1,210,834
Gross Unrealized Gains 1,680 965
Gross Unrealized Losses 107,024 109,298
Fair Value $ 1,139,996 $ 1,102,501
Weighted Average Yield 2.96% 2.79%
Mortgage-backed securities | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 847,845 $ 837,703
Gross Unrealized Gains 125 59
Gross Unrealized Losses 69,120 69,646
Fair Value $ 778,850 $ 768,116
Weighted Average Yield 2.93% 2.79%
Mortgage-backed securities | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 384,900 $ 357,497
Gross Unrealized Gains 1,555 906
Gross Unrealized Losses 37,221 38,869
Fair Value $ 349,234 $ 319,534
Weighted Average Yield 3.07% 2.80%
Mortgage-backed securities | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 12,595 $ 15,634
Gross Unrealized Gains 0 0
Gross Unrealized Losses 683 783
Fair Value $ 11,912 $ 14,851
Weighted Average Yield 2.02% 1.99%
Mortgage-backed securities | Due less than 1 year | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 0  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value $ 0  
Weighted Average Yield 0.00%  
Mortgage-backed securities | Due less than 1 year | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 0  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value $ 0  
Weighted Average Yield 0.00%  
Mortgage-backed securities | Due from 1 to 5 years | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 8,463 $ 10,155
Gross Unrealized Gains 0 0
Gross Unrealized Losses 485 550
Fair Value $ 7,978 $ 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 $ 10,633 $ 12,505
Gross Unrealized Gains 0 0
Gross Unrealized Losses 558 632
Fair Value $ 10,075 $ 11,873
Weighted Average Yield 1.69% 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 $ 11,425 $ 14,190
Gross Unrealized Gains 0 0
Gross Unrealized Losses 659 755
Fair Value $ 10,766 $ 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 $ 52,433 $ 59,167
Gross Unrealized Gains 0 0
Gross Unrealized Losses 3,803 3,764
Fair Value $ 48,630 $ 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 $ 20,551 $ 24,575
Gross Unrealized Gains 7 14
Gross Unrealized Losses 1,450 1,585
Fair Value $ 19,108 $ 23,004
Weighted Average Yield 2.16% 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 $ 265 $ 485
Gross Unrealized Gains 0 0
Gross Unrealized Losses 4 10
Fair Value $ 261 $ 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 $ 786,949 $ 768,381
Gross Unrealized Gains 125 59
Gross Unrealized Losses 64,832 65,332
Fair Value $ 722,242 $ 703,108
Weighted Average Yield 3.00% 2.87%
Mortgage-backed securities | Due after 10 years | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 353,716 $ 320,417
Gross Unrealized Gains 1,548 892
Gross Unrealized Losses 35,213 36,652
Fair Value $ 320,051 $ 284,657
Weighted Average Yield 3.16% 2.90%
Mortgage-backed securities | Due after 10 years | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 905 $ 959
Gross Unrealized Gains 0 0
Gross Unrealized Losses 20 18
Fair Value $ 885 $ 941
Weighted Average Yield 5.07% 5.06%
Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,809 $ 311,978
Gross Unrealized Gains 44 30
Gross Unrealized Losses 4 1,733
Fair Value $ 1,849 $ 310,275
Weighted Average Yield 4.63% 3.35%
Investment securities | US Treasury securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 748  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value $ 748  
Weighted Average Yield 4.77%  
Investment securities | Other debt securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,061  
Gross Unrealized Gains 44  
Gross Unrealized Losses 4  
Fair Value $ 1,101  
Weighted Average Yield 4.53%  
Investment securities | Due less than 1 year | US Treasury securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 748 $ 310,862
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 1,729
Fair Value $ 748 $ 309,133
Weighted Average Yield 4.77% 3.34%
Investment securities | Due less than 1 year | Other debt securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 376  
Gross Unrealized Gains 44  
Gross Unrealized Losses 0  
Fair Value $ 420  
Weighted Average Yield 7.00%  
Investment securities | Due from 1 to 5 years | Other debt securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 685 $ 1,116
Gross Unrealized Gains 0 30
Gross Unrealized Losses 4 4
Fair Value $ 681 $ 1,142
Weighted Average Yield 3.18% 4.45%