ACQUISITION (Details) - USD ($) $ / shares in Units, $ in Thousands	Feb. 26, 2026	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Business Combination [Line Items]
Total Assets		$ 4,522,019	$ 4,445,862
Deposits		4,013,939	3,939,469
Total Loans		3,404,911	3,418,771
Total Equity		$ 440,143	431,852	$ 404,409	$ 400,901
Adirondack Bancorp, Inc.
Business Combination [Line Items]
Entity shares issuable per acquiree share	1.8610
Cash payable per acquiree share (n dollars per share)	$ 18.72
Adirondack Bancorp, Inc.
Business Combination [Line Items]
Total Assets			942,000
Deposits			848,000
Total Loans			624,000
Total Equity			$ 67,000