NOTE 6: LOANS AND ALLOWANCE FOR LOAN LOSSES: Financing Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Provision for Loan and Lease Losses	$ (6,000)	$ (1,600)	$ (9,871)	$ (3,550)
Loans Receivable
Financing Receivable, Credit Loss, Expense (Reversal)	6,000	1,600	9,871	3,550
Financing Receivable, Allowance for Credit Loss, Writeoff	(757)	(1,982)	(1,902)	(4,748)
Accounts Receivable, Allowance for Credit Loss, Recovery	630	985	1,538	2,043
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	711		711		$ 929
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	48,418		48,418		38,704
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	672		672		661
Financing Receivable, Individually Evaluated for Impairment	9,474		9,474		10,267
Financing Receivable, Collectively Evaluated for Impairment	5,156,368		5,156,368		4,914,573
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	110,664		110,664		127,206
Individually evaluated for impairment	711		711		929
Collectively evaluated for impairment	48,418		48,418		38,704
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	672		672		661
Individually evaluated for impairment	9,474		9,474		10,267
Collectively evaluated for impairment	5,156,368		5,156,368		4,914,573
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	110,664		110,664		127,206
Loans Receivable | Beginning of Period
Provision for Loan and Lease Losses	43,928	38,651	40,294	38,409
Loans Receivable | End of Period
Provision for Loan and Lease Losses	49,801	39,254	49,801	39,254
Commercial Real Estate
Financing Receivable, Credit Loss, Expense (Reversal)	2,982	1,382	4,538	2,545
Financing Receivable, Allowance for Credit Loss, Writeoff	0	(7)	0	(7)
Accounts Receivable, Allowance for Credit Loss, Recovery	0	11	33	26
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	486		486		517
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	28,091		28,091		23,570
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	328		328		247
Financing Receivable, Individually Evaluated for Impairment	3,674		3,674		4,020
Financing Receivable, Collectively Evaluated for Impairment	1,528,600		1,528,600		1,490,152
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	26,474		26,474		29,158
Individually evaluated for impairment	486		486		517
Collectively evaluated for impairment	28,091		28,091		23,570
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	328		328		247
Individually evaluated for impairment	3,674		3,674		4,020
Collectively evaluated for impairment	1,528,600		1,528,600		1,490,152
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	26,474		26,474		29,158
Commercial Real Estate | Beginning of Period
Provision for Loan and Lease Losses	25,923	20,981	24,334	19,803
Commercial Real Estate | End of Period
Provision for Loan and Lease Losses	28,905	22,367	28,905	22,367
Commercial Loan
Financing Receivable, Credit Loss, Expense (Reversal)	563	1,145	(304)	574
Financing Receivable, Allowance for Credit Loss, Writeoff	0	(189)	(1)	(220)
Accounts Receivable, Allowance for Credit Loss, Recovery	9	8	22	20
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0		0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	2,669		2,669		2,940
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	124		124		136
Financing Receivable, Individually Evaluated for Impairment	0		0		0
Financing Receivable, Collectively Evaluated for Impairment	1,249,940		1,249,940		1,363,292
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	3,176		3,176		3,606
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	2,669		2,669		2,940
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	124		124		136
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	1,249,940		1,249,940		1,363,292
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	3,176		3,176		3,606
Commercial Loan | Beginning of Period
Provision for Loan and Lease Losses	2,221	2,515	3,076	3,105
Commercial Loan | End of Period
Provision for Loan and Lease Losses	2,793	3,479	2,793	3,479
One- to four-family residential construction
Financing Receivable, Credit Loss, Expense (Reversal)	(250)	805	144	1,163
Financing Receivable, Allowance for Credit Loss, Writeoff	(11)	(62)	(40)	(517)
Accounts Receivable, Allowance for Credit Loss, Recovery	14	24	49	35
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	78		78		198
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	4,342		4,342		3,973
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	72		72		168
Financing Receivable, Individually Evaluated for Impairment	3,054		3,054		2,960
Financing Receivable, Collectively Evaluated for Impairment	627,349		627,349		554,450
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	63,801		63,801		74,562
Individually evaluated for impairment	78		78		198
Collectively evaluated for impairment	4,342		4,342		3,973
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	72		72		168
Individually evaluated for impairment	3,054		3,054		2,960
Collectively evaluated for impairment	627,349		627,349		554,450
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	63,801		63,801		74,562
One- to four-family residential construction | Beginning of Period
Provision for Loan and Lease Losses	4,739	3,036	4,339	3,122
One- to four-family residential construction | End of Period
Provision for Loan and Lease Losses	4,492	3,803	4,492	3,803
Other residential
Financing Receivable, Credit Loss, Expense (Reversal)	2,866	(1,683)	3,738	(960)
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0	0	0
Accounts Receivable, Allowance for Credit Loss, Recovery	52	0	173	0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0		0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	8,972		8,972		5,101
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	92		92		52
Financing Receivable, Individually Evaluated for Impairment	0		0		0
Financing Receivable, Collectively Evaluated for Impairment	1,024,591		1,024,591		866,006
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	6,156		6,156		5,334
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	8,972		8,972		5,101
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	92		92		52
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	1,024,591		1,024,591		866,006
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	6,156		6,156		5,334
Other residential | Beginning of Period
Provision for Loan and Lease Losses	6,146	5,436	5,153	4,713
Other residential | End of Period
Provision for Loan and Lease Losses	9,064	3,753	9,064	3,753
Commercial Borrower
Financing Receivable, Credit Loss, Expense (Reversal)	200	62	369	(90)
Financing Receivable, Allowance for Credit Loss, Writeoff	0	(25)	(9)	(99)
Accounts Receivable, Allowance for Credit Loss, Recovery	38	157	102	299
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	9		9		13
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,767		1,767		1,306
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	41		41		36
Financing Receivable, Individually Evaluated for Impairment	1,220		1,220		1,286
Financing Receivable, Collectively Evaluated for Impairment	454,312		454,312		325,112
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	2,522		2,522		3,356
Individually evaluated for impairment	9		9		13
Collectively evaluated for impairment	1,767		1,767		1,306
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	41		41		36
Individually evaluated for impairment	1,220		1,220		1,286
Collectively evaluated for impairment	454,312		454,312		325,112
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	2,522		2,522		3,356
Commercial Borrower | Beginning of Period
Provision for Loan and Lease Losses	1,579	1,484	1,355	1,568
Commercial Borrower | End of Period
Provision for Loan and Lease Losses	1,817	1,678	1,817	1,678
Consumer Borrower
Financing Receivable, Credit Loss, Expense (Reversal)	(361)	(111)	1,386	318
Financing Receivable, Allowance for Credit Loss, Writeoff	(746)	(1,699)	(1,852)	(3,905)
Accounts Receivable, Allowance for Credit Loss, Recovery	517	785	1,159	1,663
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	138		138		201
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	2,577		2,577		1,814
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	15		15		22
Financing Receivable, Individually Evaluated for Impairment	1,526		1,526		2,001
Financing Receivable, Collectively Evaluated for Impairment	271,576		271,576		315,561
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	8,535		8,535		11,190
Individually evaluated for impairment	138		138		201
Collectively evaluated for impairment	2,577		2,577		1,814
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses	15		15		22
Individually evaluated for impairment	1,526		1,526		2,001
Collectively evaluated for impairment	271,576		271,576		315,561
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	8,535		8,535		$ 11,190
Consumer Borrower | Beginning of Period
Provision for Loan and Lease Losses	3,320	5,199	2,037	6,098
Consumer Borrower | End of Period
Provision for Loan and Lease Losses	$ 2,730	$ 4,174	$ 2,730	$ 4,174