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DERIVATIVES - Additional Information (Details)	3 Months Ended				6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($) N	Jun. 30, 2019 USD ($) N	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Derivative [Line Items]
Net interest income (expense)	$ 33,845,000	$ 31,971,000			$ 65,638,000	$ 63,718,000
Pre-tax loss on the termination of the interest rate swaps	842,000				842,000
Accrued interest receivable	23,117,000				23,117,000		$ 22,495,000
Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount	15,000,000.0				15,000,000.0
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	230,000,000.0				230,000,000.0		270,000,000.0
Net interest income (expense)	1,100,000	1,100,000			2,300,000	1,300,000
Unrealized after-tax gain of accumulated other comprehensive income (loss)			$ 26,000	$ 189,000
Interest income		$ 9,000				$ 80,000
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				230,000,000		270,000,000
Terminated Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	40,000,000.0				40,000,000.0
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	778,584,000				778,584,000		$ 823,134,000
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative [Line Items]
Accrued interest receivable	4,700,000				4,700,000
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivative [Line Items]
Accrued interest payable	$ 4,700,000				$ 4,700,000

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