GREAT SOUTHERN BANCORP, INC. AND SUBSIDIARIES -- CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statements of Comprehensive Income
Tax effect of unrealized appreciation (depreciation) on available-for-sale securities, taxes (credit)	$ (454)	$ 160	$ 21	$ (221)
Tax effect reclassification adjustment for gains included in net income, taxes	(53)	(1)	(1,046)	(1)
Tax effect of change in fair value of cash flow hedge, taxes (credit)	$ 30	$ 6	$ 21	$ (59)

Represents the monetary amount of Tax effect of unrealized appreciation (depreciation) on available-for-sale securities, taxes (credit), during the indicated time period.

No definition available.

Name:	fil_TaxEffectOfUnrealizedAppreciationDepreciationOnAvailableForSaleSecuritiesTaxesCredit
Namespace Prefix:	fil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration