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DERIVATIVES - Additional Information (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($) Contract	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Derivative [Line Items]
Net interest income (expense)	$ 48,040,000	$ 45,525,000	$ 42,893,000	$ 39,622,000	$ 37,212,000	$ 35,211,000	$ 33,845,000	$ 31,793,000	$ 176,080,000	$ 138,061,000	$ 127,602,000
Pre-tax loss on the termination of the interest rate swaps										842,000
Swap valuation allowance									673,000	2,243,000
Accrued interest receivable	25,157,000				21,589,000				25,157,000	21,589,000
Unrealized gain									6,000,000.0
Not Designated as Hedging Instrument [Member] | Commercial Real Estate Loan [Member]
Derivative [Line Items]
Swap valuation provision placed on non-accrual status										2,100
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	290,000,000.0				230,000,000.0				290,000,000.0	230,000,000.0
Net interest income (expense)									851,000,000	4,400,000
Unrealized after-tax gain of accumulated other comprehensive income (loss)	$ 167,000,000
Unrealized gain									$ 3,290,000	(3,479,000)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivative [Line Items]
Notional amount				$ 100,000,000.0
Number of forward contract | Contract				4
Derivative, maturity year				2023
Derivative, maturity term				5 years
Weighted-average fixed pay rate	2.25%								2.25%
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivative [Line Items]
Notional amount					230,000,000					230,000,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative [Line Items]
Notional amount	$ 290,000,000								$ 290,000,000
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	612,211,000				702,210,000				612,211,000	702,210,000
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivative [Line Items]
Accrued interest payable					$ 4,800					$ 4,800
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative [Line Items]
Accrued interest receivable	$ 1,100								$ 1,100

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