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INVESTMENT SECURITIES (Investment Securities by Contractual Maturity - AFS) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]    
Amortized Cost $ 1,600,651 $ 503,421
Gross Unrealized Gains 92 10,692
Gross Unrealized Losses 122,334 3,400
Fair Value $ 1,478,409 $ 510,713
Weighted Average Yield 2.80% 2.05%
Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,196,826 $ 489,155
Gross Unrealized Gains 69 10,555
Gross Unrealized Losses 121,057 3,400
Fair Value $ 1,075,838 $ 496,310
Weighted Average Yield 2.69% 2.05%
Mortgage-backed securities | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 846,984 $ 184,000
Gross Unrealized Gains 0 2,502
Gross Unrealized Losses 79,373 3,200
Fair Value $ 767,611 $ 183,302
Weighted Average Yield 2.75% 1.65%
Mortgage-backed securities | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 332,588 $ 281,061
Gross Unrealized Gains 69 7,716
Gross Unrealized Losses 40,929 199
Fair Value $ 291,728 $ 288,578
Weighted Average Yield 2.57% 2.32%
Mortgage-backed securities | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 17,254 $ 24,094
Gross Unrealized Gains 0 337
Gross Unrealized Losses 755 1
Fair Value $ 16,499 $ 24,430
Weighted Average Yield 1.98% 1.96%
Mortgage-backed securities | Due from 1 to 5 years | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 11,109  
Gross Unrealized Gains 0  
Gross Unrealized Losses 568  
Fair Value $ 10,541  
Weighted Average Yield 1.76%  
Mortgage-backed securities | Due from 1 to 5 years | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 13,916 $ 10,536
Gross Unrealized Gains 0 233
Gross Unrealized Losses 863 1
Fair Value $ 13,053 $ 10,768
Weighted Average Yield 1.65% 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 $ 15,602 $ 1,788
Gross Unrealized Gains 0 22
Gross Unrealized Losses 727 0
Fair Value $ 14,875 $ 1,810
Weighted Average Yield 1.78% 1.70%
Mortgage-backed securities | Due from 5 to 10 years | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 62,947 $ 90,560
Gross Unrealized Gains 0 2,502
Gross Unrealized Losses 4,686 0
Fair Value $ 58,261 $ 93,062
Weighted Average Yield 2.00% 1.94%
Mortgage-backed securities | Due from 5 to 10 years | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 25,877 $ 26,419
Gross Unrealized Gains 19 556
Gross Unrealized Losses 1,949 0
Fair Value $ 23,947 $ 26,975
Weighted Average Yield 2.06% 1.80%
Mortgage-backed securities | Due from 5 to 10 years | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 660 $ 20,705
Gross Unrealized Gains 0 299
Gross Unrealized Losses 12 0
Fair Value $ 648 $ 21,004
Weighted Average Yield 2.14% 1.81%
Mortgage-backed securities | Due after 10 years | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 772,928 $ 93,440
Gross Unrealized Gains 0 0
Gross Unrealized Losses 74,119 3,200
Fair Value $ 698,809 $ 90,240
Weighted Average Yield 2.82% 1.37%
Mortgage-backed securities | Due after 10 years | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 292,795 $ 244,106
Gross Unrealized Gains 50 6,927
Gross Unrealized Losses 38,117 198
Fair Value $ 254,728 $ 250,835
Weighted Average Yield 2.66% 2.40%
Mortgage-backed securities | Due after 10 years | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 992 $ 1,601
Gross Unrealized Gains 0 16
Gross Unrealized Losses 16 1
Fair Value $ 976 $ 1,616
Weighted Average Yield 5.06% 4.24%
Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 403,825 $ 14,266
Gross Unrealized Gains 23 137
Gross Unrealized Losses 1,277 0
Fair Value $ 402,571 $ 14,403
Weighted Average Yield 3.15% 1.95%
Investment securities | Other debt securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,147 $ 2,347
Gross Unrealized Gains 23 48
Gross Unrealized Losses 13 0
Fair Value $ 1,157 $ 2,395
Weighted Average Yield 3.24% 4.39%
Investment securities | Due less than 1 year | US Treasury securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 402,678 $ 10,737
Gross Unrealized Gains 0 88
Gross Unrealized Losses 1,264 0
Fair Value $ 401,414 $ 10,825
Weighted Average Yield 3.15% 1.48%
Investment securities | Due less than 1 year | Obligations of US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost   $ 1,182
Gross Unrealized Gains   1
Gross Unrealized Losses   0
Fair Value   $ 1,183
Weighted Average Yield   1.40%
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 0.57% 0.57%
Investment securities | Due from 1 to 5 years | Other debt securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 647 $ 1,847
Gross Unrealized Gains 23 48
Gross Unrealized Losses 13 0
Fair Value $ 657 $ 1,895
Weighted Average Yield 5.31% 5.43%