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INVESTMENT SECURITIES (Investment Securities by Contractual Maturity - HTM) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 530,880 | $ 535,070
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 59,265 | 65,884
Fair Value | $ 471,615 | $ 469,186
Weighted Average Yield | 2.34% | 2.30%
Due from 1 to 5 years | Investment securities | US Treasury securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 198,028 | $ 197,635
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 2,582 | 3,526
Fair Value | $ 195,446 | $ 194,109
Weighted Average Yield | 3.36% | 3.36%
Due after 10 years | Mortgage-backed securities | FNMA and FHLMC certificates |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 332,852 | $ 337,435
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 56,683 | 62,358
Fair Value | $ 276,169 | $ 275,077
Weighted Average Yield | 1.72% | 1.71%

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