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DERIVATIVES (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($) N	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) N	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) N	Dec. 31, 2017 USD ($) N	Dec. 31, 2016 USD ($)
Derivative [Line Items]
Net interest income (expense)	$ 29,385,000	$ 28,142,000	$ 29,243,000	$ 28,393,000	$ 28,586,000	$ 29,992,000	$ 26,972,000	$ 25,591,000	$ 115,163,000	$ 111,141,000	$ 96,435,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	$ 230,000,000				$ 180,000,000				$ 230,000,000	$ 180,000,000
Weighted average pay rate	2.04%				1.64%				2.04%	1.64%
Weighted average receive rate	2.33%				1.33%				2.33%	1.33%
Weighted average maturity									2 years 7 months 24 days	2 years 3 months
Unrealized gain/(loss), net									$ 808,000	$ 1,394,000
Number of contracts | N	11				9				11	9
Net interest income (expense)									$ 390,000	$ 898,000
Amount of Gain/(Loss) Recognized In OCI (Effective Portion)									(328,000)	2,138,000
Amount of Gain/(Loss) Reclassified From OCI to Interest Expense									(124,000)
Unrealized after-tax gain of accumulated other comprehensive income loss				$ 220,000
Interest income									124,000
Fair Value	$ 808,000								808,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative [Line Items]
Notional Amount	130,000,000				$ 180,000,000				130,000,000	180,000,000
Fair Value	1,657,000				1,394,000				1,657,000	1,394,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivative [Line Items]
Notional Amount	100,000,000								100,000,000
Fair Value	(849,000)								(849,000)
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	$ 558,690,000				$ 317,363,000				$ 558,690,000	$ 317,363,000
Weighted average pay rate	4.44%				4.11%				4.44%	4.11%
Weighted average receive rate	4.24%				3.43%				4.24%	3.43%
Weighted average maturity									7 years 1 month 6 days	7 years 7 months 6 days
Number of contracts | N	67				42				67	42
Fair Value	$ 9,689,000				$ 3,131,000				$ 9,689,000	$ 3,131,000

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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-Topic 825
-SubTopic 10
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Fixed interest rate related to the interest rate derivative.

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