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INVESTMENT SECURITIES - Weighted Average Yield (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
AFS
Fair value	$ 1,412,537	$ 1,378,774
Total
AFS
Due within one year, Fair value	$ 19,972	$ 10,485
Weighted Average Yield, due within one year	4.45%	4.74%
Due in one through five years, Fair value	$ 56,639	$ 35,979
Weighted Average Yield, due after one year through five years	5.05%	4.69%
Due after five years through ten years, Fair value	$ 99,444	$ 86,514
Weighted Average Yield, due after five years through ten years	3.00%	2.97%
Due after 10 years, Fair value	$ 357,583	$ 368,927
Weighted Average Yield, due after ten years	2.73%	2.83%
Fair value	$ 533,638	$ 501,905
Weighted Average Yield, Total	3.07%	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	$ 3,763	$ 3,644
Weighted Average Yield, due after one year through five years	2.02%	1.96%
Due after five years through ten years, Fair value	$ 52,312	$ 38,977
Weighted Average Yield, due after five years through ten years	3.13%	3.04%
Due after 10 years, Fair value	$ 357,583	$ 368,927
Weighted Average Yield, due after ten years	2.73%	2.83%
Fair value	$ 413,658	$ 411,548
Weighted Average Yield, Total	2.78%	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	$ 2,387	$ 2,385
Weighted Average Yield, due after one year through five years	1.84%	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	$ 2,387	$ 2,385
Weighted Average Yield, Total	1.84%	2.04%
Corporate debt securities
AFS
Due within one year, Fair value	$ 4,500	$ 0
Weighted Average Yield, due within one year	3.49%	0.00%
Due in one through five years, Fair value	$ 9,989	$ 15,342
Weighted Average Yield, due after one year through five years	5.99%	5.13%
Due after five years through ten years, Fair value	$ 26,813	$ 27,603
Weighted Average Yield, due after five years through ten years	4.12%	4.25%
Due after 10 years, Fair value	$ 0	$ 0
Weighted Average Yield, due after ten years	0.00%	0.00%
Fair value	$ 41,302	$ 42,945
Weighted Average Yield, Total	4.47%	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	$ 20,319	$ 19,934
Weighted Average Yield, due after five years through ten years	1.14%	1.11%
Due after 10 years, Fair value	$ 0	$ 0
Weighted Average Yield, due after ten years	0.00%	0.00%
Fair value	$ 20,319	$ 19,934
Weighted Average Yield, Total	1.14%	1.11%
Agency debentures
AFS
Due within one year, Fair value	$ 15,472	$ 10,485
Weighted Average Yield, due within one year	4.74%	4.74%
Due in one through five years, Fair value	$ 42,887	$ 16,993
Weighted Average Yield, due after one year through five years	5.12%	4.94%
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	$ 58,359	$ 27,478
Weighted Average Yield, Total	5.02%	4.86%

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