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INCOME TAXES: (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Federal income taxes computed at the statutory rate $ 16,320 $ 18,057 $ 14,004
Add (deduct) tax effect of:      
Tax exempt income (3,864) (3,875) (3,400)
ESOP dividend deduction (258) (1,085) 0
State tax, net of federal benefit 1,444 1,439 803
Affordable housing credits (148) (86) 0
Other, net 324 (53) 560
TOTAL $ 13,818 $ 14,397 $ 11,967