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FAIR VALUE - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 481,120,000		$ 481,120,000		$ 465,844,000
Purchase of investment			166,694,000	$ 211,014,000
Premium amortization			72,000
Specific charges to value the real estate owned	0		0		0
Changes in fair value of OREO still held	0	$ 11,000	0	11,000
Reserve for mortgage servicing rights	240,000		240,000		0
Mortgage servicing rights impairment	221,000		240,000	$ 0
Private label commercial CMOs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	7,213,000		7,213,000		7,209,000
Purchase of investment			7,213,000
Premium amortization	31,000
Unrealized loss	87,000
Unrealized gain			76,000
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	481,120,000		481,120,000		465,844,000
Allowance for loan losses	863,000		863,000		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	$ 87,767,000		$ 87,767,000		$ 75,045,000

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Amount of unrealized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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