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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amortized Cost
Due in one year or less	$ 1,715
Due after one year through five years	44,426
Due after five years through ten years	57,777
Due after ten years	125,935
Amortized Cost	775,608	$ 754,950
Fair Value
Due in one year or less	1,707
Due after one year through five years	40,450
Due after five years through ten years	54,822
Due after ten years	97,348
Fair Value	$ 660,833	647,210
Weighted Average Yield
Due in one year or less (in percent)	2.86%
Due after one year through five years (in percent)	2.61%
Due after five years through ten years (in percent)	3.78%
Due after ten years (in percent)	2.49%
Weighted Average Yield	2.56%
Amortized Cost
Due after ten years	$ 41,984
Amortized Cost	624,948	632,338
Fair Value
Due after ten years	34,660
Total held-to-maturity securities	$ 541,685	565,178	$ 673,200
Weighted Average Yield
Due after ten years (in percent)	2.26%
Total held-to-maturity securities	1.95%
Residential - U.S. government-sponsored entities and agencies
Amortized Cost
Without single maturity date	$ 412,443
Amortized Cost	412,443	441,898
Fair Value
Without single maturity date	349,637
Fair Value	$ 349,637	378,386
Weighted Average Yield
Without single maturity date (in percent)	2.12%
Amortized Cost
Without single maturity date	$ 582,964
Amortized Cost	582,964	590,379
Fair Value
Without single maturity date	507,025
Total held-to-maturity securities	$ 507,025	529,925
Weighted Average Yield
Without single maturity date (in percent)	1.92%
Residential - Non-government agencies
Amortized Cost
Without single maturity date	$ 18,893
Amortized Cost	18,893	19,322
Fair Value
Without single maturity date	17,941
Fair Value	$ 17,941	18,708
Weighted Average Yield
Without single maturity date (in percent)	4.58%
Commercial - U.S. government-sponsored entities and agencies
Amortized Cost
Without single maturity date	$ 99,213
Amortized Cost	99,213	58,318
Fair Value
Without single maturity date	83,879
Fair Value	$ 83,879	50,914
Weighted Average Yield
Without single maturity date (in percent)	2.77%
Commercial - Non-government agencies
Amortized Cost
Without single maturity date	$ 15,206
Amortized Cost	15,206	15,144
Fair Value
Without single maturity date	15,049
Fair Value	$ 15,049	$ 14,956
Weighted Average Yield
Without single maturity date (in percent)	4.98%

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