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FAIR VALUE - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 496,930,000		$ 496,930,000		$ 465,844,000
Purchase of investment			150,386,000	$ 132,373,000
Premium amortization			41,000
Specific charges to value the real estate owned	0		0		0
Changes in fair value of OREO still held	0	$ 13,000	0	$ 13,000
Private label commercial CMOs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	7,330,000		7,330,000		7,209,000
Purchase of investment			7,213,000
Premium amortization	19,000
Unrealized gain	88,000		199,000
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value liabilities	0		0		0
Fair Value	496,930,000		496,930,000		465,844,000
Allowance for loan losses	910,000		910,000		928,000
Fair Value, Measurements, Recurring | Private label commercial CMOs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 94,428,000		$ 94,428,000		$ 75,045,000

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