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INCOME TAXES: (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal income taxes computed at the statutory rate	$ 12,122	$ 17,414	$ 20,403
Add (deduct) tax effect of:
Tax exempt income	(2,495)	(4,102)	(3,992)
THFF FSI non-deductable goodwill	0	0	1,797
ESOP dividend deduction	(103)	(102)	(47)
State tax, net of federal benefit	1,846	1,483	1,978
Affordable housing credits	(148)	(148)	(148)
Federal tax reform	0	6,282
Other, net	(77)	(205)	(108)
TOTAL	$ 11,145	$ 20,622	$ 19,883

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