NOTE 6: LOANS AND ALLOWANCE FOR LOAN LOSSES: Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Satisfactory | Loans Receivable
Loan Portfolio Internal Grading System Classification	$ 5,193,393	$ 5,005,765
Satisfactory | Commercial Loan
Loan Portfolio Internal Grading System Classification	1,211,294	1,322,861
Satisfactory | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	1,467,520	1,458,400
Satisfactory | Industrial revenue bonds
Loan Portfolio Internal Grading System Classification	14,222	13,189
Satisfactory | Automobile Loan
Loan Portfolio Internal Grading System Classification	113,229	150,874
Satisfactory | Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	115,735	118,428
Satisfactory | Land Improvements
Loan Portfolio Internal Grading System Classification	38,646	40,431
Satisfactory | One- to four-family residential construction
Loan Portfolio Internal Grading System Classification	33,400	33,963
Satisfactory | Subdivision construction
Loan Portfolio Internal Grading System Classification	13,613	16,061
Satisfactory | Owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	460,804	385,001
Satisfactory | Non-owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	118,074	119,743
Satisfactory | Other residential
Loan Portfolio Internal Grading System Classification	1,024,591	866,006
Satisfactory | Commercial Borrower
Loan Portfolio Internal Grading System Classification	429,065	307,322
Satisfactory | Consumer Borrower
Loan Portfolio Internal Grading System Classification	42,548	46,294
Satisfactory | Acquired Loans Net of Discount
Loan Portfolio Internal Grading System Classification	110,652	127,192
Watch | Loans Receivable
Loan Portfolio Internal Grading System Classification	73,818	37,368
Watch | Commercial Loan
Loan Portfolio Internal Grading System Classification	0	0
Watch | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	61,080	32,063
Watch | Industrial revenue bonds
Loan Portfolio Internal Grading System Classification	0	0
Watch | Automobile Loan
Loan Portfolio Internal Grading System Classification	25	47
Watch | Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	41	43
Watch | Land Improvements
Loan Portfolio Internal Grading System Classification	0	0
Watch | One- to four-family residential construction
Loan Portfolio Internal Grading System Classification	976	0
Watch | Subdivision construction
Loan Portfolio Internal Grading System Classification	0	27
Watch | Owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	0	26
Watch | Non-owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	545	419
Watch | Other residential
Loan Portfolio Internal Grading System Classification	0	0
Watch | Commercial Borrower
Loan Portfolio Internal Grading System Classification	11,063	4,651
Watch | Consumer Borrower
Loan Portfolio Internal Grading System Classification	88	92
Watch | Acquired Loans Net of Discount
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Loans Receivable
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Commercial Loan
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Industrial revenue bonds
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Automobile Loan
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Land Improvements
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | One- to four-family residential construction
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Subdivision construction
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Non-owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Other residential
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Commercial Borrower
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Consumer Borrower
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Acquired Loans Net of Discount
Loan Portfolio Internal Grading System Classification	0	0
Substandard | Loans Receivable
Loan Portfolio Internal Grading System Classification	9,295	8,913
Substandard | Commercial Loan
Loan Portfolio Internal Grading System Classification	0	0
Substandard | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	3,674	3,709
Substandard | Industrial revenue bonds
Loan Portfolio Internal Grading System Classification	0	0
Substandard | Automobile Loan
Loan Portfolio Internal Grading System Classification	673	933
Substandard | Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	517	517
Substandard | Land Improvements
Loan Portfolio Internal Grading System Classification	0	0
Substandard | One- to four-family residential construction
Loan Portfolio Internal Grading System Classification	0	0
Substandard | Subdivision construction
Loan Portfolio Internal Grading System Classification	24	0
Substandard | Owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	2,689	1,989
Substandard | Non-owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	278	181
Substandard | Other residential
Loan Portfolio Internal Grading System Classification	0	0
Substandard | Commercial Borrower
Loan Portfolio Internal Grading System Classification	1,182	1,236
Substandard | Consumer Borrower
Loan Portfolio Internal Grading System Classification	246	334
Substandard | Acquired Loans Net of Discount
Loan Portfolio Internal Grading System Classification	12	14
Doubtful | Loans Receivable
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Commercial Loan
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Industrial revenue bonds
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Automobile Loan
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Land Improvements
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | One- to four-family residential construction
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Subdivision construction
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Non-owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Other residential
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Commercial Borrower
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Consumer Borrower
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Acquired Loans Net of Discount
Loan Portfolio Internal Grading System Classification	0	0
Internal Investment Grade Total | Loans Receivable
Loan Portfolio Internal Grading System Classification	5,276,506	5,052,046
Internal Investment Grade Total | Commercial Loan
Loan Portfolio Internal Grading System Classification	1,211,294	1,322,861
Internal Investment Grade Total | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	1,532,274	1,494,172
Internal Investment Grade Total | Industrial revenue bonds
Loan Portfolio Internal Grading System Classification	14,222	13,189
Internal Investment Grade Total | Automobile Loan
Loan Portfolio Internal Grading System Classification	113,927	151,854
Internal Investment Grade Total | Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	116,293	118,988
Internal Investment Grade Total | Land Improvements
Loan Portfolio Internal Grading System Classification	38,646	40,431
Internal Investment Grade Total | One- to four-family residential construction
Loan Portfolio Internal Grading System Classification	34,376	33,963
Internal Investment Grade Total | Subdivision construction
Loan Portfolio Internal Grading System Classification	13,637	16,088
Internal Investment Grade Total | Owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	463,493	387,016
Internal Investment Grade Total | Non-owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	118,897	120,343
Internal Investment Grade Total | Other residential
Loan Portfolio Internal Grading System Classification	1,024,591	866,006
Internal Investment Grade Total | Commercial Borrower
Loan Portfolio Internal Grading System Classification	441,310	313,209
Internal Investment Grade Total | Consumer Borrower
Loan Portfolio Internal Grading System Classification	42,882	46,720
Internal Investment Grade Total | Acquired Loans Net of Discount
Loan Portfolio Internal Grading System Classification	$ 110,664	$ 127,206