EMPLOYEE BENEFIT PLANS - Bank's Pension Plan Asset Allocation (Details)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Jun. 30, 2024
Pension plan asset allocation, target allocation and expected long-term rate of return by asset category
Expected long-term rate of return on plan assets	6.00%	6.00%	5.75%
Pension Plan Assets
Pension plan asset allocation, target allocation and expected long-term rate of return by asset category
Percentage of Plan Assets	100.00%	100.00%
Equity securities
Pension plan asset allocation, target allocation and expected long-term rate of return by asset category
Target allocation	65.00%
Percentage of Plan Assets	63.10%	62.30%
Fixed income securities
Pension plan asset allocation, target allocation and expected long-term rate of return by asset category
Target allocation	35.00%
Percentage of Plan Assets	36.90%	37.70%
Minimum \| Equity securities
Pension plan asset allocation, target allocation and expected long-term rate of return by asset category
Expected long-term rate of return on plan assets	5.00%
Minimum \| Fixed income securities
Pension plan asset allocation, target allocation and expected long-term rate of return by asset category
Expected long-term rate of return on plan assets	1.00%
Maximum \| Equity securities
Pension plan asset allocation, target allocation and expected long-term rate of return by asset category
Expected long-term rate of return on plan assets	9.00%
Maximum \| Fixed income securities
Pension plan asset allocation, target allocation and expected long-term rate of return by asset category
Expected long-term rate of return on plan assets	4.00%