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INVESTMENT SECURITIES (Investment Securities by Contractual Maturity - AFS) (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Amortized Cost $ 2,198,116 $ 2,177,761
Gross Unrealized Gains 10,287 13,476
Gross Unrealized Losses 112,097 91,973
Fair Value $ 2,096,306 $ 2,099,264
Weighted Average Yield 4.17% 4.07%
Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,996,877 $ 1,880,395
Gross Unrealized Gains 10,285 13,424
Gross Unrealized Losses 112,095 91,970
Fair Value $ 1,895,067 $ 1,801,849
Weighted Average Yield 4.04% 3.86%
Mortgage-backed securities | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,557,846 $ 1,464,134
Gross Unrealized Gains 5,261 8,989
Gross Unrealized Losses 71,946 57,178
Fair Value $ 1,491,161 $ 1,415,945
Weighted Average Yield 4.21% 4.03%
Mortgage-backed securities | GNMA certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 431,345 $ 406,275
Gross Unrealized Gains 5,024 4,435
Gross Unrealized Losses 39,864 34,416
Fair Value $ 396,505 $ 376,294
Weighted Average Yield 3.47% 3.30%
Mortgage-backed securities | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 7,686 $ 9,986
Gross Unrealized Gains 0 0
Gross Unrealized Losses 285 376
Fair Value $ 7,401 $ 9,610
Weighted Average Yield 2.11% 2.06%
Mortgage-backed securities | Due less than 1 year | GNMA certificates    
Schedule of Investments [Line Items]    
Amortized Cost   $ 5
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Fair Value   $ 5
Weighted Average Yield   1.31%
Mortgage-backed securities | Due from 1 to 5 years | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 8,933 $ 6,972
Gross Unrealized Gains 0 0
Gross Unrealized Losses 421 311
Fair Value $ 8,512 $ 6,661
Weighted Average Yield 1.98% 1.76%
Mortgage-backed securities | Due from 1 to 5 years | GNMA certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 7,965 $ 8,851
Gross Unrealized Gains 0 0
Gross Unrealized Losses 319 351
Fair Value $ 7,646 $ 8,500
Weighted Average Yield 1.72% 1.71%
Mortgage-backed securities | Due from 1 to 5 years | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 6,896 $ 9,071
Gross Unrealized Gains 0 0
Gross Unrealized Losses 274 364
Fair Value $ 6,622 $ 8,707
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 $ 36,742 $ 45,835
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2,517 2,767
Fair Value $ 34,225 $ 43,068
Weighted Average Yield 1.97% 2.00%
Mortgage-backed securities | Due from 5 to 10 years | GNMA certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 13,552 $ 17,113
Gross Unrealized Gains 7 16
Gross Unrealized Losses 883 955
Fair Value $ 12,676 $ 16,174
Weighted Average Yield 2.23% 2.19%
Mortgage-backed securities | Due from 5 to 10 years | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost   $ 54
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Fair Value   $ 54
Weighted Average Yield   2.14%
Mortgage-backed securities | Due after 10 years | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,512,171 $ 1,411,327
Gross Unrealized Gains 5,261 8,989
Gross Unrealized Losses 69,008 54,100
Fair Value $ 1,448,424 $ 1,366,216
Weighted Average Yield 4.28% 4.11%
Mortgage-backed securities | Due after 10 years | GNMA certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 409,828 $ 380,306
Gross Unrealized Gains 5,017 4,419
Gross Unrealized Losses 38,662 33,110
Fair Value $ 376,183 $ 351,615
Weighted Average Yield 3.54% 3.38%
Mortgage-backed securities | Due after 10 years | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 790 $ 861
Gross Unrealized Gains 0 0
Gross Unrealized Losses 11 12
Fair Value $ 779 $ 849
Weighted Average Yield 5.06% 5.07%
Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 201,239 $ 297,366
Gross Unrealized Gains 2 52
Gross Unrealized Losses 2 3
Fair Value $ 201,239 $ 297,415
Weighted Average Yield 5.41% 5.39%
Investment securities | Other debt securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 583 $ 619
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2 3
Fair Value $ 581 $ 616
Weighted Average Yield 3.21% 3.20%
Investment securities | Due less than 1 year | US Treasury securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 200,656 $ 296,747
Gross Unrealized Gains 2 52
Gross Unrealized Losses 0 0
Fair Value $ 200,658 $ 296,799
Weighted Average Yield 5.41% 5.40%
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 3.25% 3.25%
Investment securities | Due from 1 to 5 years | Other debt securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 83 $ 119
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2 3
Fair Value $ 81 $ 116
Weighted Average Yield 2.97% 2.97%