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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022 | May 31, 2022 | Mar. 31, 2022
--- | --- | --- | --- | ---
Amortized Cost |  |  |  |
Due in one year or less | $ 0 |  |  |
Due after one year through five years | 0 |  |  |
Due after five years through ten years | 0 |  |  |
Due after ten years | 41,867 |  |  |
Amortized Cost | 658,596 | $ 664,883 |  |
Fair Value |  |  |  |
Due in one year or less | 0 |  |  |
Due after one year through five years | 0 |  |  |
Due after five years through ten years | 0 |  |  |
Due after ten years | 37,121 |  |  |
Fair Value | $ 599,300 | 596,780 | $ 343,700 | $ 329,500
Weighted Average Yield |  |  |  |
Due in one year or less (in percent) | 0.00% |  |  |
Due after one year through five years (in percent) | 0.00% |  |  |
Due after give years through ten years (in percent) | 0.00% |  |  |
Due after ten years (in percent) | 2.26% |  |  |
Weighted Average Yield | 1.96% |  |  |
Amortized Cost |  |  |  |
Due in one year or less | $ 5,185 |  |  |
Due after one year through five years | 16,601 |  |  |
Due after five years through ten years | 76,927 |  |  |
Due after ten years | 134,535 |  |  |
Amortized Cost | 801,506 | 801,370 |  |
Fair Value |  |  |  |
Due in one year or less | 5,171 |  |  |
Due after one year through five years | 16,323 |  |  |
Due after five years through ten years | 69,210 |  |  |
Due after ten years | 104,257 |  |  |
Fair Value | $ 687,188 | 671,794 |  |
Weighted Average Yield |  |  |  |
Due in one year or less (in percent) | 3.01% |  |  |
Due after one year through five years (in percent) | 3.90% |  |  |
Due after five years through ten years (in percent) | 2.68% |  |  |
Due after ten years (in percent) | 2.48% |  |  |
Weighted Average Yield | 2.33% |  |  |
Residential - U.S. Government-sponsored entities |  |  |  |
Amortized Cost |  |  |  |
Without single maturity date | $ 616,729 |  |  |
Amortized Cost | 616,729 | 623,043 |  |
Fair Value |  |  |  |
Without single maturity date | 562,179 |  |  |
Fair Value | $ 562,179 | 559,667 |  |
Weighted Average Yield |  |  |  |
Without single maturity date (in percent) | 1.94% |  |  |
Amortized Cost |  |  |  |
Without single maturity date | $ 488,550 |  |  |
Amortized Cost | 488,550 | 498,989 |  |
Fair Value |  |  |  |
Without single maturity date | 421,484 |  |  |
Fair Value | $ 421,484 | 423,803 |  |
Weighted Average Yield |  |  |  |
Without single maturity date (in percent) | 2.04% |  |  |
Residential - Non-government agencies |  |  |  |
Amortized Cost |  |  |  |
Amortized Cost |  | 0 |  |
Fair Value |  |  |  |
Fair Value |  | 0 |  |
Amortized Cost |  |  |  |
Without single maturity date | $ 9,614 |  |  |
Amortized Cost | 9,614 | 9,829 |  |
Fair Value |  |  |  |
Without single maturity date | 8,637 |  |  |
Fair Value | $ 8,637 | 8,662 |  |
Weighted Average Yield |  |  |  |
Without single maturity date (in percent) | 3.32% |  |  |
Commercial - U.S. Government-sponsored entities |  |  |  |
Amortized Cost |  |  |  |
Amortized Cost |  | 0 |  |
Fair Value |  |  |  |
Fair Value |  | 0 |  |
Amortized Cost |  |  |  |
Without single maturity date | $ 53,597 |  |  |
Amortized Cost | 53,597 | 54,346 |  |
Fair Value |  |  |  |
Without single maturity date | 45,800 |  |  |
Fair Value | $ 45,800 | 46,144 |  |
Weighted Average Yield |  |  |  |
Without single maturity date (in percent) | 2.35% |  |  |
Commercial - Non-government agencies |  |  |  |
Amortized Cost |  |  |  |
Amortized Cost |  | 0 |  |
Fair Value |  |  |  |
Fair Value |  | 0 |  |
Amortized Cost |  |  |  |
Without single maturity date | $ 16,497 |  |  |
Amortized Cost | 16,497 | 1,541 |  |
Fair Value |  |  |  |
Without single maturity date | 16,306 |  |  |
Fair Value | $ 16,306 | $ 1,507 |  |
Weighted Average Yield |  |  |  |
Without single maturity date (in percent) | 5.05% |  |  |

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