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INVESTMENT SECURITIES - Weighted Average Yield (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
AFS
Fair value	$ 1,354,198	$ 1,378,774
Total
AFS
Due within one year, Fair value	$ 19,916	$ 10,485
Weighted Average Yield, due within one year	4.44%	4.74%
Due in one through five years, Fair value	$ 56,290	$ 35,979
Weighted Average Yield, due after one year through five years	5.02%	4.69%
Due after five years through ten years, Fair value	$ 102,428	$ 86,514
Weighted Average Yield, due after five years through ten years	2.84%	2.97%
Due after 10 years, Fair value	$ 346,170	$ 368,927
Weighted Average Yield, due after ten years	2.70%	2.83%
Fair value	$ 524,804	$ 501,905
Weighted Average Yield, Total	3.01%	3.01%
Municipal bonds
AFS
Due within one year, Fair value	$ 35	$ 0
Weighted Average Yield, due within one year	2.65%	0.00%
Due in one through five years, Fair value	$ 3,722	$ 3,644
Weighted Average Yield, due after one year through five years	2.00%	1.96%
Due after five years through ten years, Fair value	$ 55,618	$ 38,977
Weighted Average Yield, due after five years through ten years	3.02%	3.04%
Due after 10 years, Fair value	$ 346,170	$ 368,927
Weighted Average Yield, due after ten years	2.70%	2.83%
Fair value	$ 405,545	$ 411,548
Weighted Average Yield, Total	2.74%	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	$ 2,337	$ 2,385
Weighted Average Yield, due after one year through five years	1.81%	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	$ 2,337	$ 2,385
Weighted Average Yield, Total	1.81%	2.04%
Corporate debt securities
AFS
Due within one year, Fair value	$ 4,439	$ 0
Weighted Average Yield, due within one year	3.47%	0.00%
Due in one through five years, Fair value	$ 9,933	$ 15,342
Weighted Average Yield, due after one year through five years	5.96%	5.13%
Due after five years through ten years, Fair value	$ 24,651	$ 27,603
Weighted Average Yield, due after five years through ten years	3.82%	4.25%
Due after 10 years, Fair value	$ 0	$ 0
Weighted Average Yield, due after ten years	0.00%	0.00%
Fair value	$ 39,023	$ 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	$ 0	$ 0
Weighted Average Yield, due after one year through five years	0.00%	0.00%
Due after five years through ten years, Fair value	$ 19,868	$ 19,934
Weighted Average Yield, due after five years through ten years	1.12%	1.11%
Due after 10 years, Fair value	$ 0	$ 0
Weighted Average Yield, due after ten years	0.00%	0.00%
Fair value	$ 19,868	$ 19,934
Weighted Average Yield, Total	1.12%	1.11%
Agency debentures
AFS
Due within one year, Fair value	$ 15,442	$ 10,485
Weighted Average Yield, due within one year	4.72%	4.74%
Due in one through five years, Fair value	$ 42,635	$ 16,993
Weighted Average Yield, due after one year through five years	5.09%	4.94%
Due after five years through ten years, Fair value	$ 2,291	$ 0
Weighted Average Yield, due after five years through ten years	2.04%	0.00%
Due after 10 years, Fair value	$ 0	$ 0
Weighted Average Yield, due after ten years	0.00%	0.00%
Fair value	$ 60,368	$ 27,478
Weighted Average Yield, Total	4.87%	4.86%

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