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SECURITIES: (Details Textual)	2 Months Ended	12 Months Ended
	Mar. 06, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Debt Securities, Available-for-sale [Line Items]
Securities pledged as collateral		$ 393,300,000	$ 423,900,000
Gain on sale of investments		5,000	185,000
Loss on sale of investments		$ 3,000	5,000
Number of investment securities with an amortized cost greater than fair value (investments)		335
Cumulative OTTI charges		$ 2,974,000	7,132,000	$ 13,974,000	$ 13,995,000
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale		143,157,000	141,819,000	$ 168,506,000
Amortized Cost		793,084,000	811,369,000
Securities available-for-sale		784,916,000	814,931,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ 15,214,000	$ 9,535,000
Standard Poors | Minimum
Debt Securities, Available-for-sale [Line Items]
Credit quality indicator pricing		81.46
Moody Investor Service | Minimum
Debt Securities, Available-for-sale [Line Items]
Credit quality indicator pricing		21.14
Other Than Temporarily Impaired Cdo [Member]
Debt Securities, Available-for-sale [Line Items]
Contractual balance		$ 3,700,000
Reduced balance		3,300,000
Interest payment received		600,000
Cumulative OTTI charges		3,000,000
Other comprehensive income net		$ 3,100,000
Base discount rate, which is subject to an additional margin		3 month LIBOR
London Interbank Offered Rate (LIBOR) [Member] | Other Than Temporarily Impaired Cdo [Member]
Debt Securities, Available-for-sale [Line Items]
Available For Sale Securities Present Value Of Future Cash Flows Discount Rate, Basis Point Spread on Variable Rate Basis, Minimum		1.60%
Available For Sale Securities Present Value Of Future Cash Flows Discount Rate, Basis Point Spread on Variable Rate Basis, Maximum		1.80%
Subsequent Event [Member]
Debt Securities, Available-for-sale [Line Items]
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale	$ 3,100,000

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Net of tax amount of cumulative other than temporary impairment (OTTI) on a debt security, categorized as available-for-sale, recognized in other comprehensive income (loss), attributable to the parent entity.

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