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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 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 | 41,898 |  |  |
Amortized Cost | 649,946 | $ 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 | 36,636 |  |  |
Total held-to-maturity securities | $ 581,222 | 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% |  |  |
Total held-to-maturity securities | 1.94% |  |  |
Amortized Cost |  |  |  |
Due in one year or less | $ 5,000 |  |  |
Due after one year through five years | 23,629 |  |  |
Due after five years through ten years | 68,204 |  |  |
Due after ten years | 131,382 |  |  |
Amortized Cost | 786,593 | 801,370 |  |
Fair Value |  |  |  |
Due in one year or less | 4,986 |  |  |
Due after one year through five years | 22,594 |  |  |
Due after five years through ten years | 60,466 |  |  |
Due after ten years | 100,493 |  |  |
Fair Value | $ 664,071 | 671,794 |  |
Weighted Average Yield |  |  |  |
Due in one year or less (in percent) | 3.03% |  |  |
Due after one year through five years (in percent) | 3.67% |  |  |
Due after five years through ten years (in percent) | 2.67% |  |  |
Due after ten years (in percent) | 2.52% |  |  |
Weighted Average Yield | 2.33% |  |  |
Residential - U.S. Government-sponsored entities |  |  |  |
Amortized Cost |  |  |  |
Without single maturity date | $ 608,048 |  |  |
Amortized Cost | 608,048 | 623,043 |  |
Fair Value |  |  |  |
Without single maturity date | 544,586 |  |  |
Total held-to-maturity securities | $ 544,586 | 559,667 |  |
Weighted Average Yield |  |  |  |
Without single maturity date (in percent) | 1.92% |  |  |
Amortized Cost |  |  |  |
Without single maturity date | $ 479,165 |  |  |
Amortized Cost | 479,165 | 498,989 |  |
Fair Value |  |  |  |
Without single maturity date | 406,127 |  |  |
Fair Value | $ 406,127 | 423,803 |  |
Weighted Average Yield |  |  |  |
Without single maturity date (in percent) | 2.02% |  |  |
Residential - Non-government agencies |  |  |  |
Amortized Cost |  |  |  |
Without single maturity date | $ 9,512 |  |  |
Amortized Cost | 9,512 | 9,829 |  |
Fair Value |  |  |  |
Without single maturity date | 8,355 |  |  |
Fair Value | $ 8,355 | 8,662 |  |
Weighted Average Yield |  |  |  |
Without single maturity date (in percent) | 3.32% |  |  |
Commercial - U.S. Government-sponsored entities |  |  |  |
Amortized Cost |  |  |  |
Without single maturity date | $ 53,142 |  |  |
Amortized Cost | 53,142 | 54,346 |  |
Fair Value |  |  |  |
Without single maturity date | 44,985 |  |  |
Fair Value | $ 44,985 | 46,144 |  |
Weighted Average Yield |  |  |  |
Without single maturity date (in percent) | 2.35% |  |  |
Commercial - Non-government agencies |  |  |  |
Amortized Cost |  |  |  |
Without single maturity date | $ 16,559 |  |  |
Amortized Cost | 16,559 | 1,541 |  |
Fair Value |  |  |  |
Without single maturity date | 16,065 |  |  |
Fair Value | $ 16,065 | $ 1,507 |  |
Weighted Average Yield |  |  |  |
Without single maturity date (in percent) | 5.06% |  |  |

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