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INVESTMENT SECURITIES (Investment Securities by Contractual Maturity - AFS) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]    
Amortized Cost $ 903,798 $ 503,421
Gross Unrealized Gains 964 10,692
Gross Unrealized Losses 24,424 3,400
Fair Value $ 880,338 $ 510,713
Weighted Average Yield 2.24% 2.05%
Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 890,740 $ 489,155
Gross Unrealized Gains 875 10,555
Gross Unrealized Losses 24,424 3,400
Fair Value $ 867,191 $ 496,310
Weighted Average Yield 2.24% 2.05%
Mortgage-backed securities | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 574,290 $ 184,000
Gross Unrealized Gains 2 2,502
Gross Unrealized Losses 15,402 3,200
Fair Value $ 558,890 $ 183,302
Weighted Average Yield 2.21% 1.65%
Mortgage-backed securities | FNMA and FHLMC certificates | Due from 1 to 5 years    
Schedule of Investments [Line Items]    
Amortized Cost $ 2,020  
Gross Unrealized Gains 0  
Gross Unrealized Losses 5  
Fair Value $ 2,015  
Weighted Average Yield 2.13%  
Mortgage-backed securities | FNMA and FHLMC certificates | Due from 5 to 10 years    
Schedule of Investments [Line Items]    
Amortized Cost $ 82,101 $ 90,560
Gross Unrealized Gains 2 2,502
Gross Unrealized Losses 1,168 0
Fair Value $ 80,935 $ 93,062
Weighted Average Yield 1.94% 1.94%
Mortgage-backed securities | FNMA and FHLMC certificates | Due after 10 years    
Schedule of Investments [Line Items]    
Amortized Cost $ 490,169 $ 93,440
Gross Unrealized Gains 0 0
Gross Unrealized Losses 14,229 3,200
Fair Value $ 475,940 $ 90,240
Weighted Average Yield 2.25% 1.37%
Mortgage-backed securities | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 295,018 $ 281,061
Gross Unrealized Gains 872 7,716
Gross Unrealized Losses 8,694 199
Fair Value $ 287,196 $ 288,578
Weighted Average Yield 2.32% 2.32%
Mortgage-backed securities | GNMA Securities | Due from 1 to 5 years    
Schedule of Investments [Line Items]    
Amortized Cost $ 16,836 $ 10,536
Gross Unrealized Gains 0 233
Gross Unrealized Losses 146 1
Fair Value $ 16,690 $ 10,768
Weighted Average Yield 1.63% 1.66%
Mortgage-backed securities | GNMA Securities | Due from 5 to 10 years    
Schedule of Investments [Line Items]    
Amortized Cost $ 16,470 $ 26,419
Gross Unrealized Gains 0 556
Gross Unrealized Losses 327 0
Fair Value $ 16,143 $ 26,975
Weighted Average Yield 1.88% 1.80%
Mortgage-backed securities | GNMA Securities | Due after 10 years    
Schedule of Investments [Line Items]    
Amortized Cost $ 261,712 $ 244,106
Gross Unrealized Gains 872 6,927
Gross Unrealized Losses 8,221 198
Fair Value $ 254,363 $ 250,835
Weighted Average Yield 2.40% 2.40%
Mortgage-backed securities | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 21,432 $ 24,094
Gross Unrealized Gains 1 337
Gross Unrealized Losses 328 1
Fair Value $ 21,105 $ 24,430
Weighted Average Yield 1.96% 1.96%
Mortgage-backed securities | CMOs issued by US government-sponsored agencies | Due from 1 to 5 years    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,523 $ 1,788
Gross Unrealized Gains 0 22
Gross Unrealized Losses 24 0
Fair Value $ 1,499 $ 1,810
Weighted Average Yield 1.70% 1.70%
Mortgage-backed securities | CMOs issued by US government-sponsored agencies | Due from 5 to 10 years    
Schedule of Investments [Line Items]    
Amortized Cost $ 18,584 $ 20,705
Gross Unrealized Gains 0 299
Gross Unrealized Losses 300 0
Fair Value $ 18,284 $ 21,004
Weighted Average Yield 1.80% 1.81%
Mortgage-backed securities | CMOs issued by US government-sponsored agencies | Due after 10 years    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,325 $ 1,601
Gross Unrealized Gains 1 16
Gross Unrealized Losses 4 1
Fair Value $ 1,322 $ 1,616
Weighted Average Yield 4.53% 4.24%
Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 13,058 $ 14,266
Gross Unrealized Gains 89 137
Gross Unrealized Losses 0 0
Fair Value $ 13,147 $ 14,403
Weighted Average Yield 2.01% 1.95%
Investment securities | US Treasury securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 10,735 $ 10,737
Gross Unrealized Gains 28 88
Gross Unrealized Losses 0 0
Fair Value $ 10,763 $ 10,825
Weighted Average Yield 1.49% 1.48%
Investment securities | US Treasury securities | Due less than 1 year    
Schedule of Investments [Line Items]    
Amortized Cost $ 10,735 $ 10,737
Gross Unrealized Gains 28 88
Gross Unrealized Losses 0 0
Fair Value $ 10,763 $ 10,825
Weighted Average Yield 1.49% 1.48%
Investment securities | 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 | Obligations of US government-sponsored agencies | Due less than 1 year    
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 | Other debt securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 2,323 $ 2,347
Gross Unrealized Gains 61 48
Gross Unrealized Losses 0 0
Fair Value $ 2,384 $ 2,395
Weighted Average Yield 4.41% 4.39%
Investment securities | Other debt securities | Due less than 1 year    
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 | Other debt securities | Due from 1 to 5 years    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,823 $ 1,847
Gross Unrealized Gains 61 48
Gross Unrealized Losses 0 0
Fair Value $ 1,884 $ 1,895
Weighted Average Yield 5.46% 5.43%