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INCOME TAXES: (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Federal income taxes computed at the statutory rate $ 20,403 $ 14,206 $ 16,786
Add (deduct) tax effect of:      
Tax exempt income (3,992) (4,047) (4,016)
THFF FSI non-deductable goodwill 1,797 0 0
ESOP dividend deduction (47) (164) (284)
State tax, net of federal benefit 1,978 829 1,743
Affordable housing credits (148) (148) (148)
Other, net (108) (284) 108
TOTAL $ 19,883 $ 10,392 $ 14,189