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INVESTMENT SECURITIES - Weighted Average Yield (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
AFS
Fair value	$ 1,270,654	$ 1,378,774
Total
AFS
Due within one year, Fair value	$ 22,871	$ 10,485
Weighted Average Yield, due within one year	4.64%	4.74%
Due in one through five years, Fair value	$ 59,535	$ 35,979
Weighted Average Yield, due after one year through five years	4.48%	4.69%
Due after five years through ten years, Fair value	$ 96,858	$ 86,514
Weighted Average Yield, due after five years through ten years	2.82%	2.97%
Due after 10 years, Fair value	$ 322,550	$ 368,927
Weighted Average Yield, due after ten years	2.50%	2.83%
Fair value	$ 501,814	$ 501,905
Weighted Average Yield, Total	2.85%	3.01%
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	$ 5,669	$ 3,644
Weighted Average Yield, due after one year through five years	1.78%	1.96%
Due after five years through ten years, Fair value	$ 53,217	$ 38,977
Weighted Average Yield, due after five years through ten years	3.00%	3.04%
Due after 10 years, Fair value	$ 319,412	$ 368,927
Weighted Average Yield, due after ten years	2.51%	2.83%
Fair value	$ 378,298	$ 411,548
Weighted Average Yield, Total	2.56%	2.84%
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	$ 2,293	$ 2,385
Weighted Average Yield, due after one year through five years	1.79%	2.04%
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	$ 2,293	$ 2,385
Weighted Average Yield, Total	1.79%	2.04%
Corporate debt securities
AFS
Due within one year, Fair value	$ 4,441	$ 0
Weighted Average Yield, due within one year	3.51%	0.00%
Due in one through five years, Fair value	$ 13,600	$ 15,342
Weighted Average Yield, due after one year through five years	5.26%	5.13%
Due after five years through ten years, Fair value	$ 20,927	$ 27,603
Weighted Average Yield, due after five years through ten years	3.80%	4.25%
Due after 10 years, Fair value	$ 0	$ 0
Weighted Average Yield, due after ten years	0.00%	0.00%
Fair value	$ 38,968	$ 42,945
Weighted Average Yield, Total	4.25%	4.54%
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	$ 4,618	$ 0
Weighted Average Yield, due after one year through five years	1.14%	0.00%
Due after five years through ten years, Fair value	$ 14,827	$ 19,934
Weighted Average Yield, due after five years through ten years	1.08%	1.11%
Due after 10 years, Fair value	$ 0	$ 0
Weighted Average Yield, due after ten years	0.00%	0.00%
Fair value	$ 19,445	$ 19,934
Weighted Average Yield, Total	1.10%	1.11%
Agency debentures
AFS
Due within one year, Fair value	$ 18,430	$ 10,485
Weighted Average Yield, due within one year	4.91%	4.74%
Due in one through five years, Fair value	$ 35,648	$ 16,993
Weighted Average Yield, due after one year through five years	5.13%	4.94%
Due after five years through ten years, Fair value	$ 7,887	$ 0
Weighted Average Yield, due after five years through ten years	2.09%	0.00%
Due after 10 years, Fair value	$ 3,138	$ 0
Weighted Average Yield, due after ten years	1.95%	0.00%
Fair value	$ 65,103	$ 27,478
Weighted Average Yield, Total	4.49%	4.86%

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