INVESTMENT SECURITIES - Allowance for credit losses to HTM securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Allowance for credit losses:
Beginning balance			$ 71
Total ending allowance balance	$ 71		71
Corporate bonds
Allowance for credit losses:
Beginning balance	71	$ 71	71	$ 0
Provision for credit losses	0	0	0	0
Securities charged-off (recoveries)	0	0	0	0
Total ending allowance balance	71	71	71	71
Corporate bonds | Cumulative change in accounting principle
Allowance for credit losses:
Beginning balance			0	71
Mortgage-Backed Securities, Issued by Private Enterprises
Allowance for credit losses:
Beginning balance	0	0	0	0
Provision for credit losses	0	0	0	0
Securities charged-off (recoveries)	0	0	0	0
Total ending allowance balance	$ 0	$ 0	0	0
Mortgage-Backed Securities, Issued by Private Enterprises | Cumulative change in accounting principle
Allowance for credit losses:
Beginning balance			$ 0	$ 0