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INVESTMENT SECURITIES - Weighted Average Yield (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
AFS
Fair value	$ 1,161,008	$ 1,251,199
Total
AFS
Due within one year, Fair value	$ 16,962	$ 21,402
Weighted Average Yield, due within one year	5.00%	4.64%
Due in one through five years, Fair value	$ 65,543	$ 69,679
Weighted Average Yield, due after one year through five years	3.62%	3.64%
Due after five years through ten years, Fair value	$ 93,106	$ 89,941
Weighted Average Yield, due after five years through ten years	3.34%	3.40%
Due after 10 years, Fair value	$ 330,974	$ 341,488
Weighted Average Yield, due after ten years	2.99%	3.00%
Fair value	$ 506,585	$ 522,510
Weighted Average Yield, Total	3.20%	3.21%
Municipal bonds
AFS
Due within one year, Fair value	$ 0	$ 0
Weighted Average Yield, due within one year	0.00%	0.00%
Due in one through five years, Fair value	$ 5,847	$ 5,856
Weighted Average Yield, due after one year through five years	1.84%	1.84%
Due after five years through ten years, Fair value	$ 64,423	$ 60,775
Weighted Average Yield, due after five years through ten years	3.24%	3.36%
Due after 10 years, Fair value	$ 327,830	$ 338,243
Weighted Average Yield, due after ten years	3.00%	3.01%
Fair value	$ 398,100	$ 404,874
Weighted Average Yield, Total	3.02%	3.04%
HTM
Due within one year, Fair value	$ 0	$ 0
Weighted Average Yield, due within one year	0.00%	0.00%
Due in one through five years, Fair value	$ 2,305	$ 2,331
Weighted Average Yield, due after one year through five years	2.28%	2.29%
Due after five years through ten years, Fair value	$ 0	$ 0
Weighted Average Yield, due after five years through ten years	0.00%	0.00%
Due after ten years, Fair value	$ 0	$ 0
Weighted Average Yield, due after ten years	0.00%	0.00%
Fair Value	$ 2,305	$ 2,331
Weighted Average Yield, Total	2.28%	2.29%
Corporate debt securities
AFS
Due within one year, Fair value	$ 0	$ 4,425
Weighted Average Yield, due within one year	0.00%	3.53%
Due in one through five years, Fair value	$ 13,867	$ 12,714
Weighted Average Yield, due after one year through five years	4.87%	4.95%
Due after five years through ten years, Fair value	$ 21,285	$ 21,408
Weighted Average Yield, due after five years through ten years	4.07%	3.89%
Due after 10 years, Fair value	$ 0	$ 0
Weighted Average Yield, due after ten years	0.00%	0.00%
Fair value	$ 35,152	$ 38,547
Weighted Average Yield, Total	4.38%	4.21%
U.S. Treasury securities
AFS
Due within one year, Fair value	$ 0	$ 0
Weighted Average Yield, due within one year	0.00%	0.00%
Due in one through five years, Fair value	$ 19,896	$ 20,184
Weighted Average Yield, due after one year through five years	1.13%	1.14%
Due after five years through ten years, Fair value	$ 0	$ 0
Weighted Average Yield, due after five years through ten years	0.00%	0.00%
Due after 10 years, Fair value	$ 0	$ 0
Weighted Average Yield, due after ten years	0.00%	0.00%
Fair value	$ 19,896	$ 20,184
Weighted Average Yield, Total	1.13%	1.14%
Agency debentures
AFS
Due within one year, Fair value	$ 16,962	$ 16,977
Weighted Average Yield, due within one year	5.00%	4.93%
Due in one through five years, Fair value	$ 25,933	$ 30,925
Weighted Average Yield, due after one year through five years	5.26%	5.20%
Due after five years through ten years, Fair value	$ 7,398	$ 7,758
Weighted Average Yield, due after five years through ten years	2.13%	2.15%
Due after 10 years, Fair value	$ 3,144	$ 3,245
Weighted Average Yield, due after ten years	2.14%	2.17%
Fair value	$ 53,437	$ 58,905
Weighted Average Yield, Total	4.56%	4.51%

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