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INVESTMENT SECURITIES (Investment Securities by Contractual Maturity - AFS) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]    
Amortized Cost $ 1,217,883 $ 503,421
Gross Unrealized Gains 1,683 10,692
Gross Unrealized Losses 59,996 3,400
Fair Value $ 1,159,570 $ 510,713
Weighted Average Yield 2.64% 2.05%
Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,204,851 $ 489,155
Gross Unrealized Gains 1,602 10,555
Gross Unrealized Losses 59,994 3,400
Fair Value $ 1,146,459 $ 496,310
Weighted Average Yield 2.64% 2.05%
Mortgage-backed securities | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 873,817 $ 184,000
Gross Unrealized Gains 948 2,502
Gross Unrealized Losses 35,303 3,200
Fair Value $ 839,462 $ 183,302
Weighted Average Yield 2.74% 1.65%
Mortgage-backed securities | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 311,911 $ 281,061
Gross Unrealized Gains 654 7,716
Gross Unrealized Losses 24,208 199
Fair Value $ 288,357 $ 288,578
Weighted Average Yield 2.44% 2.32%
Mortgage-backed securities | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 19,123 $ 24,094
Gross Unrealized Gains 0 337
Gross Unrealized Losses 483 1
Fair Value $ 18,640 $ 24,430
Weighted Average Yield 1.97% 1.96%
Mortgage-backed securities | Due from 1 to 5 years | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,759  
Gross Unrealized Gains 0  
Gross Unrealized Losses 31  
Fair Value $ 1,728  
Weighted Average Yield 2.12%  
Mortgage-backed securities | Due from 1 to 5 years | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 15,130 $ 10,536
Gross Unrealized Gains 0 233
Gross Unrealized Losses 431 1
Fair Value $ 14,699 $ 10,768
Weighted Average Yield 1.63% 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 $ 14,809 $ 1,788
Gross Unrealized Gains 0 22
Gross Unrealized Losses 391 0
Fair Value $ 14,418 $ 1,810
Weighted Average Yield 1.79% 1.70%
Mortgage-backed securities | Due from 5 to 10 years | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 76,908 $ 90,560
Gross Unrealized Gains 0 2,502
Gross Unrealized Losses 2,005 0
Fair Value $ 74,903 $ 93,062
Weighted Average Yield 1.95% 1.94%
Mortgage-backed securities | Due from 5 to 10 years | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 28,190 $ 26,419
Gross Unrealized Gains 38 556
Gross Unrealized Losses 997 0
Fair Value $ 27,231 $ 26,975
Weighted Average Yield 2.03% 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 $ 3,223 $ 20,705
Gross Unrealized Gains 0 299
Gross Unrealized Losses 79 0
Fair Value $ 3,144 $ 21,004
Weighted Average Yield 1.82% 1.81%
Mortgage-backed securities | Due after 10 years | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 795,150 $ 93,440
Gross Unrealized Gains 948 0
Gross Unrealized Losses 33,267 3,200
Fair Value $ 762,831 $ 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 $ 268,591 $ 244,106
Gross Unrealized Gains 616 6,927
Gross Unrealized Losses 22,780 198
Fair Value $ 246,427 $ 250,835
Weighted Average Yield 2.52% 2.40%
Mortgage-backed securities | Due after 10 years | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,091 $ 1,601
Gross Unrealized Gains 0 16
Gross Unrealized Losses 13 1
Fair Value $ 1,078 $ 1,616
Weighted Average Yield 4.88% 4.24%
Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 13,032 $ 14,266
Gross Unrealized Gains 81 137
Gross Unrealized Losses 2 0
Fair Value $ 13,111 $ 14,403
Weighted Average Yield 2.04% 1.95%
Investment securities | Other debt securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 2,298 $ 2,347
Gross Unrealized Gains 81 48
Gross Unrealized Losses 1 0
Fair Value $ 2,378 $ 2,395
Weighted Average Yield 4.43% 4.39%
Investment securities | Due less than 1 year | US Treasury securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 10,734 $ 10,737
Gross Unrealized Gains 0 88
Gross Unrealized Losses 1 0
Fair Value $ 10,733 $ 10,825
Weighted Average Yield 1.53% 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 $ 1,798 $ 1,847
Gross Unrealized Gains 81 48
Gross Unrealized Losses 1 0
Fair Value $ 1,878 $ 1,895
Weighted Average Yield 5.50% 5.43%