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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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