GREAT SOUTHERN BANCORP, INC. AND SUBSIDIARIES -- CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Statements of Comprehensive Income
Tax effect of unrealized appreciation (depreciation) on available-for-sale securities, taxes (credit)	$ 238	$ 36
Tax effect reclassification adjustment for gains included in net income, taxes	0	(1)
Tax effect of change in fair value of cash flow hedge, taxes (credit)	$ 29	$ (17)

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