DERIVATIVES - Additional Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($) Contract	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Derivative [Line Items]
Net interest income	$ 39,622,000	$ 31,793,000
Swap valuation allowance	673,000
Accrued interest receivable	22,890,000		$ 21,589,000
Not Designated as Hedging Instrument [Member] | Commercial Real Estate Loan [Member]
Derivative [Line Items]
Swap valuation provision placed on non-accrual status			2,100,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	230,000,000.0		230,000,000.0
Unrealized loss	(665,000)		(3,479,000)
Net interest income	999,000	$ 1,200,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative [Line Items]
Notional amount	80,000,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivative [Line Items]
Notional amount	150,000,000		230,000,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivative [Line Items]
Notional amount	$ 100,000,000.0
Derivative, maturity year	2023
Derivative, maturity term	5 years
Weighted-average fixed pay rate	2.25%
Number of forward contract | Contract	4
Unrealized loss	$ 18,000
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	677,502,000		702,210,000
Swap valuation allowance	126,000		126,000
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative [Line Items]
Accrued interest receivable	3,600,000		3,600,000
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivative [Line Items]
Accrued interest payable	$ 4,800,000		$ 4,800,000