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FAIR VALUE - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 490,221,000		$ 465,844,000
Premium amortization		$ 0
Specific charges to value the real estate owned	0		0
Private label commercial CMOs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	7,261,000		7,209,000
Purchase of investment			7,213,000
Premium amortization	22,000
Unrealized gain	111,000	$ 0
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value liabilities	0		0
Fair Value	490,221,000		465,844,000
Allowance for loan losses	915,000		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	$ 77,119,000		$ 75,045,000

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- Definition

Amount of 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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Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

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Amount of amortization of purchase premium on nonoperating securities.

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Fair value of financial and nonfinancial obligations.

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Amount of cash outflow to acquire 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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Specific charges to value the real estate owned at the lower of cost or fair value on properties.

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