PARENT COMPANY CONDENSED FINANCIAL STATEMENTS: (Details 1) - 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
Condensed Financial Statements, Captions [Line Items]
Income tax benefit									$ (11,692)	$ (12,127)	$ (11,145)
NET INCOME	$ 15,739	$ 14,000	$ 11,924	$ 12,181	$ 14,364	$ 12,257	$ 12,569	$ 9,682	53,844	48,872	46,583
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									71,109	64,825	40,199
Parent
Condensed Financial Statements, Captions [Line Items]
Dividends from subsidiaries									31,069	81,281	13,651
Other income									1,054	720	720
Other operating expenses									(3,430)	(4,327)	(2,814)
Income before income taxes and equity in undistributed earnings of subsidiaries									28,319	77,532	11,557
Income tax benefit									801	908	934
Income before equity in undistributed earnings of subsidiaries									29,120	78,440	12,491
Equity in undistributed earnings of subsidiaries									24,724	(29,568)	34,092
NET INCOME									$ 53,844	$ 48,872	$ 46,583