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INVESTMENT SECURITIES - Weighted Average Yield (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
AFS
Fair value	$ 1,006,727	$ 1,019,959
Total
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	$ 57,694	$ 40,023
Weighted average yield, due after one year through five years	2.69%	2.32%
Due after five years through ten years, fair value	$ 87,125	$ 97,329
Weighted average yield, due after five years through ten years	3.24%	3.19%
Due after 10 years, fair value	$ 284,207	$ 295,114
Weighted average yield, due after ten years	2.88%	2.92%
Fair value	$ 429,026	$ 432,466
Weighted average yield	2.93%	2.93%
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	$ 32,980	$ 15,531
Weighted average yield, due after one year through five years	3.70%	3.88%
Due after five years through ten years, fair value	$ 59,895	$ 70,678
Weighted average yield, due after five years through ten years	2.89%	2.92%
Due after 10 years, fair value	$ 281,116	$ 292,050
Weighted average yield, due after ten years	2.89%	2.93%
Fair value	$ 373,991	$ 378,259
Weighted average yield	2.96%	2.97%
HTM
Due within one year, fair value	$ 2,266	$ 2,273
Weighted average yield, due within one year	2.30%	2.29%
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	$ 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	$ 2,266	$ 2,273
Weighted average yield, total	2.30%	2.29%
Corporate debt 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	$ 2,818	$ 2,735
Weighted average yield, due after one year through five years	2.15%	2.08%
Due after five years through ten years, fair value	$ 22,772	$ 22,209
Weighted average yield, due after five years through ten years	4.37%	4.27%
Due after 10 years, fair value	$ 0	$ 0
Weighted average yield, due after ten years	0.00%	0.00%
Fair value	$ 25,590	$ 24,944
Weighted average yield	4.12%	4.03%
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	$ 20,317	$ 19,987
Weighted average yield, due after one year through five years	1.17%	1.15%
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	$ 20,317	$ 19,987
Weighted average yield	1.17%	1.15%
Agency debentures
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	$ 1,579	$ 1,770
Weighted average yield, due after one year through five years	2.16%	2.13%
Due after five years through ten years, fair value	$ 4,458	$ 4,442
Weighted average yield, due after five years through ten years	2.21%	2.17%
Due after 10 years, fair value	$ 3,091	$ 3,064
Weighted average yield, due after ten years	2.18%	2.14%
Fair value	$ 9,128	$ 9,276
Weighted average yield	2.19%	2.15%

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