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RESTRICTIONS ON CASH AND DUE FROM BANKS:	12 Months Ended
RESTRICTIONS ON CASH AND DUE FROM BANKS:	Dec. 31, 2017
Restrictions On Cash and Due From Banks Disclosure [Abstract]
RESTRICTIONS ON CASH AND DUE FROM BANKS	RESTRICTIONS ON CASH AND DUE FROM BANKS: Certain affiliate banks are required to maintain average reserve balances with the Federal Reserve Bank. The amount of those reserve balances was approximately $12.5 million and $12.0 million at December 31, 2017 and 2016, respectively.