Note 16: Derivatives and Hedging Activities: Cash Flow Hedges (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Details
Interest Rate Swap Interest Income	$ 2,000,000.0	$ 801	$ 5,600,000	$ 1,900,000
Noninterest income related to changes in the fair value of derivative	0	$ 0	$ 0	$ 0
Noninterest income related to changes in the fair value of derivative	$ 45,900,000

The net cash outflow or inflow from derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690

Name:	us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration