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INVESTMENT SECURITIES (Gross Realized Gains and Losses by Category) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |
Sale Price | $ 242,126 | $ 2,174 | $ 320,984
Investment securities | US Treasury securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sale Price | 242,126 |  |
Book Value at Sale | 242,373 |  |
Gross Gains | 0 |  |
Gross Losses | $ 247 |  |
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sale Price |  |  | 320,984
Book Value at Sale |  | 2,200 | 316,256
Gross Losses |  |  | 0
Mortgage-backed securities | GNMA certificates |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sale Price |  | 2,175 | 91,413
Book Value at Sale |  | 2,156 | 89,043
Gross Gains |  | 19 | 2,370
Gross Losses |  | $ 0 | 0
Mortgage-backed securities | FNMA and FHLMC certificates |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sale Price |  |  | 229,571
Book Value at Sale |  |  | 227,213
Gross Gains |  |  | 2,358
Gross Losses |  |  | $ 0

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