SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounting Standards Adopted in 2023 (Details) - USD ($)	Jun. 30, 2023	Mar. 31, 2023	Jan. 01, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle
Allowance for credit losses	$ 18,091,000	$ 18,947,000		$ 13,888,000	$ 16,678,000	$ 16,674,000	$ 16,952,000
Allowance for unfunded commitments	241,000
Decrease in retained earnings	301,752,000			285,832,000
Accrued interest receivable for AFS securities	$ 115,000			$ 114,000
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Interest Receivable			Interest Receivable
Adjustment | 2016-13
New Accounting Pronouncements or Change in Accounting Principle
Allowance for credit losses			$ 5,100,000	$ 5,055,000
Allowance for unfunded commitments			239,000
Decrease in retained earnings			(3,800,000)
Increase in deferred tax assets			$ 1,500,000