ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details) - USD ($)		9 Months Ended
		Sep. 30, 2022		Sep. 30, 2021	Jun. 30, 2022	Jan. 01, 2022	Dec. 31, 2021		Jun. 30, 2021	Dec. 31, 2020
Financing Receivable Recorded Investment Past Due [Line Items]
Accrued interest receivable		$ 17,816,000					$ 21,589,000
Individually evaluated loans balance		12,500,000					19,887,000
Individually evaluated include Nonaccrual loans		13,000,000.0					15,600,000
Recording charge-off							7,400,000
Individually evaluated non-accrual loans performing troubled debt restructured		0					2,500,000
Allowance allocated to troubled debt restructured loans		2,400,000					0
Allowance for credit losses		59,683,000	[1]	$ 65,133,000	$ 59,022,000		$ 61,697,000	[1]	$ 63,505,000	$ 67,309,000
Reduction to allowance for credit losses		(925,000)
Provision for credit losses	[2]	$ 4,423,000		2,725,000
Allowance for credit losses, percentage of loans		1.15%					1.28%
ASU 2016-13 [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Reduction to allowance for credit losses						$ 5,500,000
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Individually evaluated loans balance				$ 12,400,000
Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Accrued interest receivable		$ 16,100,000					$ 19,100,000

[1] Commencing on January 1, 2022, the allowance calculation is based on the current expected credit loss ("CECL") methodology. Prior to January 1, 2022, the calculation was based on the incurred loss methodology.

[2] Commencing on January 1, 2022, the allowance calculation is based on the CECL methodology. Prior to January 1, 2022, the calculation was based on the incurred loss methodology.