LOANS AND ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 01, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Allowance for credit losses	$ 67,300,000
Troubled Debt Restructurings Internal Grading System Substandard		$ 2,800,000				$ 2,900,000
Financing Receivables, Troubled Debt Restructuring		3,600,000		$ 3,600,000		3,900,000
Non-accrual loans for no related allowance amortized cost				2,900,000
TDR loans evaluated on individual	100,000
After-tax effect decreased retained earnings	14,200,000
Troubled Debt Restructurings Returned to Accrual Status		290,000	$ 310,000	511,000	$ 337,000
Loans and Leases Receivable, Allowance		61,058,000		61,058,000		60,754,000
Impaired Financing Receivable, Related Allowance		211,000		211,000		495,000
Provision for Loan Losses		0	(1,000,000.0)	0	(700,000)
FDIC-acquired loans and remaining Accretable yield						$ 429,000
Minimum loan balance with addition to TDR status for classification of loans into Collateral-dependent loans				100,000
Allowance for unfunded commitment
Allowance for credit losses	8,700,000
Provision for Loan Losses		$ 2,200,000	$ (307,000)	$ 2,000,000.0	$ (981,000)
PCI [Member]
Allowance for credit losses	1,900,000
Adopted ASC 326 [Member]
Loans and Leases Receivable, Allowance	$ 11,600,000