PARENT COMPANY CONDENSED FINANCIAL STATEMENTS: (Details 1) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Income tax benefit										$ (19,883)	$ (10,392)	$ (14,189)
NET INCOME	$ 8,344	$ 8,162	$ 8,232	$ 13,675	$ 7,114	$ 8,398	$ 6,923	$ 7,761		38,413	30,196	33,772
Comprehensive Income (Loss), Net of Tax, Attributable to Parent								$ 35,324	$ 33,212	33,650
Parent
Condensed Financial Statements, Captions [Line Items]
Dividends from subsidiaries										31,781	19,397	26,530
Other income										722	795	724
Other operating expenses										(2,581)	(2,314)	(2,747)
Income before income taxes and equity in undistributed earnings of subsidiaries										29,922	17,878	24,507
Income tax benefit										821	815	1,156
Income before equity in undistributed earnings of subsidiaries										30,743	18,693	25,663
Equity in undistributed earnings of subsidiaries										7,670	11,503	8,109
NET INCOME										$ 38,413	$ 30,196	$ 33,772