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INVESTMENT SECURITIES - Weighted Average Yield (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
AVAILABLE FOR SALE
Fair value	$ 1,251,199	$ 1,378,774
Municipal bonds
AVAILABLE FOR SALE
Due within one year or less, fair value	$ 0	$ 0
Due in one year or less, weighted average yield	0.00%	0.00%
Due after one year through five years, fair value	$ 5,856	$ 3,644
Due after one year through five years, weighted average yield	1.84%	1.96%
Due after five years through ten years, fair value	$ 60,775	$ 38,977
Due after five years through ten years, weighted average yield	3.36%	3.04%
Due after ten years, fair value	$ 338,243	$ 368,927
Due after ten years, weighted average yield	3.01%	2.83%
Fair value	$ 404,874	$ 411,548
Weighted average yield	3.04%	2.84%
Held-to-maturity Securities
Due within one year or less, fair value	$ 0	$ 0
Due in one year or less, weighted average yield	0.00%	0.00%
Due after one year through five years, fair value	$ 2,331	$ 2,385
Due after one year through five years, weighted average yield	2.29%	2.04%
Due after five years through ten years, fair value	$ 0	$ 0
Due after five years through ten years, weighted average yield	0.00%	0.00%
Due after ten years, fair value	$ 0	$ 0
Due after ten years, weighted average yield	0.00%	0.00%
Fair value	$ 2,331	$ 2,385
Weighted average yield	2.29%	2.04%
Corporate debt securities
AVAILABLE FOR SALE
Due within one year or less, fair value	$ 4,425	$ 0
Due in one year or less, weighted average yield	3.53%	0.00%
Due after one year through five years, fair value	$ 12,714	$ 15,342
Due after one year through five years, weighted average yield	4.95%	5.13%
Due after five years through ten years, fair value	$ 21,408	$ 27,603
Due after five years through ten years, weighted average yield	3.89%	4.25%
Due after ten years, fair value	$ 0	$ 0
Due after ten years, weighted average yield	0.00%	0.00%
Fair value	$ 38,547	$ 42,945
Weighted average yield	4.21%	4.54%
U.S. Treasury securities
AVAILABLE FOR SALE
Due within one year or less, fair value	$ 0	$ 0
Due in one year or less, weighted average yield	0.00%	0.00%
Due after one year through five years, fair value	$ 20,184	$ 0
Due after one year through five years, weighted average yield	1.14%	0.00%
Due after five years through ten years, fair value	$ 0	$ 19,934
Due after five years through ten years, weighted average yield	0.00%	1.11%
Due after ten years, fair value	$ 0	$ 0
Due after ten years, weighted average yield	0.00%	0.00%
Fair value	$ 20,184	$ 19,934
Weighted average yield	1.14%	1.11%
Agency debentures
AVAILABLE FOR SALE
Due within one year or less, fair value	$ 16,977	$ 10,485
Due in one year or less, weighted average yield	4.93%	4.74%
Due after one year through five years, fair value	$ 30,925	$ 16,993
Due after one year through five years, weighted average yield	5.20%	4.94%
Due after five years through ten years, fair value	$ 7,758	$ 0
Due after five years through ten years, weighted average yield	2.15%	0.00%
Due after ten years, fair value	$ 3,245	$ 0
Due after ten years, weighted average yield	2.17%	0.00%
Fair value	$ 58,905	$ 27,478
Weighted average yield	4.51%	4.86%
Municipal Bonds, Corporate Debt Securities, US Treasury Securities and Agency Debentures
AVAILABLE FOR SALE
Due within one year or less, fair value	$ 21,402	$ 10,485
Due in one year or less, weighted average yield	4.64%	4.74%
Due after one year through five years, fair value	$ 69,679	$ 35,979
Due after one year through five years, weighted average yield	3.64%	4.69%
Due after five years through ten years, fair value	$ 89,941	$ 86,514
Due after five years through ten years, weighted average yield	3.40%	2.97%
Due after ten years, fair value	$ 341,488	$ 368,927
Due after ten years, weighted average yield	3.00%	2.83%
Fair value	$ 522,510	$ 501,905
Weighted average yield	3.21%	3.01%

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