SECURITIES: (Details Textual) - USD ($)	2 Months Ended	12 Months Ended
	Mar. 04, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Securities, Available-for-sale [Line Items]
Securities pledged as collateral		$ 596,200,000	$ 393,300,000
Gain on sale of investments		55,000	5,000
Loss on sale of investments		$ 11,000	126,000
Number of investment securities with an amortized cost greater than fair value (investments)		97
Cumulative OTTI charges		$ 2,974,000	2,974,000	$ 7,132,000	$ 13,974,000
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale		181,763,000	143,157,000	$ 141,819,000
Amortized Cost		907,575,000	793,084,000
Securities available-for-sale		926,717,000	784,916,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		1,834,000	$ 15,214,000
Other Than Temporarily Impaired Cdo [Member]
Debt Securities, Available-for-sale [Line Items]
Contractual balance		3,700,000
Reduced balance		3,600,000
Interest payment received		800,000
Cumulative OTTI charges		3,000,000
Other comprehensive income net		$ 3,600,000
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