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DERIVATIVES - Additional Information (Details)	3 Months Ended									12 Months Ended
	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($) N	Jun. 30, 2019 USD ($) N	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Derivative [Line Items]
Net interest income (expense)	$ 37,212,000	$ 35,211,000	$ 33,845,000	$ 31,793,000	$ 31,735,000	$ 32,149,000	$ 31,971,000	$ 31,747,000		$ 138,061,000	$ 127,602,000	$ 120,274,000
Pre-tax loss on the termination of the interest rate swaps										842,000
Swap valuation allowance										2,243,000
Accrued interest receivable	21,589,000				22,495,000					21,589,000	22,495,000
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Swap valuation allowance	130,000
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]
Derivative [Line Items]
Notional amount			15,000,000.0
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	230,000,000.0				270,000,000.0					230,000,000.0	270,000,000.0
Net interest income (expense)										4,400,000	3,700,000
Unrealized after-tax gain of accumulated other comprehensive income (loss)								$ 26,000	$ 189,000
Interest income											89,000	$ 223,000
Derivative number of instruments terminated | N								3	4
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivative [Line Items]
Notional amount	230,000,000				270,000,000					230,000,000	270,000,000
Terminated Interest Rate Swap | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount			$ 40,000,000.0
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	702,210,000				$ 823,134,000					702,210,000	$ 823,134,000
Accrued interest payable	4,800,000									4,800,000
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
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative [Line Items]
Accrued interest receivable	$ 4,800,000									$ 4,800,000

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