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INVESTMENT SECURITIES (Investment Securities by Contractual Maturity - AFS) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 1,445,218 | $ 1,522,812
Gross Unrealized Gains | 2,242 | 995
Gross Unrealized Losses | 94,354 | 111,031
Fair Value | $ 1,353,106 | $ 1,412,776
Weighted Average Yield | 2.93% | 2.90%
Amortized Cost | $ 530,880 | $ 535,070
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 59,265 | 65,884
Investment securities held-to-maturity | $ 471,615 | $ 469,186
Weighted Average Yield | 2.34% | 2.30%
Mortgage-backed securities |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 1,200,929 | $ 1,210,834
Gross Unrealized Gains | 2,201 | 965
Gross Unrealized Losses | 93,241 | 109,298
Fair Value | $ 1,109,889 | $ 1,102,501
Weighted Average Yield | 2.83% | 2.79%
Mortgage-backed securities | FNMA and FHLMC certificates |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 819,585 | $ 837,703
Gross Unrealized Gains | 235 | 59
Gross Unrealized Losses | 59,677 | 69,646
Fair Value | $ 760,143 | $ 768,116
Weighted Average Yield | 2.81% | 2.79%
Mortgage-backed securities | GNMA Securities |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 367,224 | $ 357,497
Gross Unrealized Gains | 1,966 | 906
Gross Unrealized Losses | 32,915 | 38,869
Fair Value | $ 336,275 | $ 319,534
Weighted Average Yield | 2.92% | 2.80%
Mortgage-backed securities | CMOs issued by US government-sponsored agencies |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 14,120 | $ 15,634
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 649 | 783
Fair Value | $ 13,471 | $ 14,851
Weighted Average Yield | 2.00% | 1.99%
Mortgage-backed securities | Due from 1 to 5 years | FNMA and FHLMC certificates |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 9,307 | $ 10,155
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 440 | 550
Fair Value | $ 8,867 | $ 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 | $ 11,053 | $ 12,505
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 476 | 632
Fair Value | $ 10,577 | $ 11,873
Weighted Average Yield | 1.66% | 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 | $ 12,811 | $ 14,190
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 624 | 755
Fair Value | $ 12,187 | $ 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 | $ 55,558 | $ 59,167
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 3,627 | 3,764
Fair Value | $ 51,931 | $ 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 | $ 23,129 | $ 24,575
Gross Unrealized Gains | 20 | 14
Gross Unrealized Losses | 1,309 | 1,585
Fair Value | $ 21,840 | $ 23,004
Weighted Average Yield | 2.14% | 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 | $ 377 | $ 485
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 7 | 10
Fair Value | $ 370 | $ 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 | $ 754,720 | $ 768,381
Gross Unrealized Gains | 235 | 59
Gross Unrealized Losses | 55,610 | 65,332
Fair Value | $ 699,345 | $ 703,108
Weighted Average Yield | 2.89% | 2.87%
Amortized Cost | $ 332,852 | $ 337,435
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 56,683 | 62,358
Investment securities held-to-maturity | $ 276,169 | $ 275,077
Weighted Average Yield | 1.72% | 1.71%
Mortgage-backed securities | Due after 10 years | GNMA Securities |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 333,042 | $ 320,417
Gross Unrealized Gains | 1,946 | 892
Gross Unrealized Losses | 31,130 | 36,652
Fair Value | $ 303,858 | $ 284,657
Weighted Average Yield | 3.01% | 2.90%
Mortgage-backed securities | Due after 10 years | CMOs issued by US government-sponsored agencies |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 932 | $ 959
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 18 | 18
Fair Value | $ 914 | $ 941
Weighted Average Yield | 5.06% | 5.06%
Investment securities |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 244,289 | $ 311,978
Gross Unrealized Gains | 41 | 30
Gross Unrealized Losses | 1,113 | 1,733
Fair Value | $ 243,217 | $ 310,275
Weighted Average Yield | 3.41% | 3.35%
Investment securities | Other debt securities |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 1,086 |
Gross Unrealized Gains | 37 |
Gross Unrealized Losses | 4 |
Fair Value | $ 1,119 |
Weighted Average Yield | 4.49% |
Investment securities | Due less than 1 year | US Treasury securities |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 243,203 | $ 310,862
Gross Unrealized Gains | 4 | 0
Gross Unrealized Losses | 1,109 | 1,729
Fair Value | $ 242,098 | $ 309,133
Weighted Average Yield | 3.41% | 3.34%
Investment securities | Due less than 1 year | Other debt securities |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 376 |
Gross Unrealized Gains | 37 |
Gross Unrealized Losses | 0 |
Fair Value | $ 413 |
Weighted Average Yield | 7.00% |
Investment securities | Due from 1 to 5 years | US Treasury securities |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 198,028 | $ 197,635
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 2,582 | 3,526
Investment securities held-to-maturity | $ 195,446 | $ 194,109
Weighted Average Yield | 3.36% | 3.36%
Investment securities | Due from 1 to 5 years | Other debt securities |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 710 | $ 1,116
Gross Unrealized Gains | 0 | 30
Gross Unrealized Losses | 4 | 4
Fair Value | $ 706 | $ 1,142
Weighted Average Yield | 3.17% | 4.45%

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