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INCOME TAXES: (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal:
Currently payable	$ 7,018	$ 8,303	$ 15,514
Deferred	1,793	3,756	1,326
Federal tax reform	0	6,282
Federal income tax expense (benefit), continuing operations	8,811	18,341	16,840
State:
Currently payable	1,699	1,818	2,857
Deferred	635	463	186
State and local income tax expense (benefit), continuing operations	2,334	2,281	3,043
TOTAL	$ 11,145	$ 20,622	$ 19,883

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