ACQUISITIONS AND FDIC INDEMNIFICATION ASSET: (Details Textual) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Deposits	$ 3,755,945				$ 3,275,357				$ 3,755,945	$ 3,275,357
Goodwill	78,592				78,592				78,592	78,592
Assets	4,557,544				4,023,250				4,557,544	4,023,250
Net Income (Loss) Attributable to Parent	$ 15,739	$ 14,000	$ 11,924	$ 12,181	$ 14,364	$ 12,257	$ 12,569	$ 9,682	$ 53,844	$ 48,872	$ 46,583