NOTE 6: LOANS AND ALLOWANCE FOR LOAN LOSSES: Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Satisfactory | Automobile Loan
Loan Portfolio Internal Grading System Classification	$ 228,600	$ 251,824
Satisfactory | One-to-Four-Family Residential Construction
Loan Portfolio Internal Grading System Classification	26,904	25,803
Satisfactory | Subdivision Construction
Loan Portfolio Internal Grading System Classification	12,334	12,077
Satisfactory | Land Development
Loan Portfolio Internal Grading System Classification	41,938	39,892
Satisfactory | Commercial Construction
Loan Portfolio Internal Grading System Classification	1,328,853	1,417,166
Satisfactory | Owner Occupied One-to-Four-Family Residential
Loan Portfolio Internal Grading System Classification	287,220	274,661
Satisfactory | Non-Owner Occupied One To Four Family Residential
Loan Portfolio Internal Grading System Classification	117,073	119,951
Satisfactory | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	1,363,967	1,357,987
Satisfactory | Other Residential
Loan Portfolio Internal Grading System Classification	864,491	784,393
Satisfactory | Commercial Business
Loan Portfolio Internal Grading System Classification	315,063	315,518
Satisfactory | Industrial Revenue Bonds
Loan Portfolio Internal Grading System Classification	13,702	13,940
Satisfactory | Consumer Loan
Loan Portfolio Internal Grading System Classification	52,908	56,859
Satisfactory | Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	120,294	121,134
Satisfactory | Acquired Loans Net of Discount
Loan Portfolio Internal Grading System Classification	161,107	167,632
Satisfactory | Loans Receivable
Loan Portfolio Internal Grading System Classification	4,934,454	4,958,837
Watch | Automobile Loan
Loan Portfolio Internal Grading System Classification	94	116
Watch | One-to-Four-Family Residential Construction
Loan Portfolio Internal Grading System Classification	31	374
Watch | Subdivision Construction
Loan Portfolio Internal Grading System Classification	0	1,718
Watch | Land Development
Loan Portfolio Internal Grading System Classification	4,500	4,600
Watch | Commercial Construction
Loan Portfolio Internal Grading System Classification	0	0
Watch | Owner Occupied One-to-Four-Family Residential
Loan Portfolio Internal Grading System Classification	0	43
Watch | Non-Owner Occupied One To Four Family Residential
Loan Portfolio Internal Grading System Classification	937	941
Watch | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	19,892	11,061
Watch | Other Residential
Loan Portfolio Internal Grading System Classification	499	501
Watch | Commercial Business
Loan Portfolio Internal Grading System Classification	4,858	5,163
Watch | Industrial Revenue Bonds
Loan Portfolio Internal Grading System Classification	0	0
Watch | Consumer Loan
Loan Portfolio Internal Grading System Classification	154	157
Watch | Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	151	118
Watch | Acquired Loans Net of Discount
Loan Portfolio Internal Grading System Classification	0	0
Watch | Loans Receivable
Loan Portfolio Internal Grading System Classification	31,116	24,792
Special Mention | Automobile Loan
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 | Land Development
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Commercial 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 | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Other Residential
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Commercial Business
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Industrial Revenue Bonds
Loan Portfolio Internal Grading System Classification	0	0
Special Mention | Consumer 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 | 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
Substandard | Automobile Loan
Loan Portfolio Internal Grading System Classification	1,006	1,588
Substandard | One-to-Four-Family Residential Construction
Loan Portfolio Internal Grading System Classification	0	0
Substandard | Subdivision Construction
Loan Portfolio Internal Grading System Classification	18	49
Substandard | Land Development
Loan Portfolio Internal Grading System Classification	0	0
Substandard | Commercial Construction
Loan Portfolio Internal Grading System Classification	0	0
Substandard | Owner Occupied One-to-Four-Family Residential
Loan Portfolio Internal Grading System Classification	1,713	2,162
Substandard | Non-Owner Occupied One To Four Family Residential
Loan Portfolio Internal Grading System Classification	248	1,546
Substandard | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	4,819	2,387
Substandard | Other Residential
Loan Portfolio Internal Grading System Classification	0	0
Substandard | Commercial Business
Loan Portfolio Internal Grading System Classification	1,406	1,437
Substandard | Industrial Revenue Bonds
Loan Portfolio Internal Grading System Classification	0	0
Substandard | Consumer Loan
Loan Portfolio Internal Grading System Classification	286	334
Substandard | Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	251	100
Substandard | Acquired Loans Net of Discount
Loan Portfolio Internal Grading System Classification	18	19
Substandard | Loans Receivable
Loan Portfolio Internal Grading System Classification	9,765	9,622
Doubtful | Automobile Loan
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 | Land Development
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Commercial 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 | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Other Residential
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Commercial Business
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Industrial Revenue Bonds
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Consumer Loan
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Acquired Loans Net of Discount
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Loans Receivable
Loan Portfolio Internal Grading System Classification	0	0
Total for Portfolio | Automobile Loan
Loan Portfolio Internal Grading System Classification	229,700	253,528
Total for Portfolio | One-to-Four-Family Residential Construction
Loan Portfolio Internal Grading System Classification	26,935	26,177
Total for Portfolio | Subdivision Construction
Loan Portfolio Internal Grading System Classification	12,352	13,844
Total for Portfolio | Land Development
Loan Portfolio Internal Grading System Classification	46,438	44,492
Total for Portfolio | Commercial Construction
Loan Portfolio Internal Grading System Classification	1,328,853	1,417,166
Total for Portfolio | Owner Occupied One-to-Four-Family Residential
Loan Portfolio Internal Grading System Classification	288,933	276,866
Total for Portfolio | Non-Owner Occupied One To Four Family Residential
Loan Portfolio Internal Grading System Classification	118,258	122,438
Total for Portfolio | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	1,388,678	1,371,435
Total for Portfolio | Other Residential
Loan Portfolio Internal Grading System Classification	864,990	784,894
Total for Portfolio | Commercial Business
Loan Portfolio Internal Grading System Classification	321,327	322,118
Total for Portfolio | Industrial Revenue Bonds
Loan Portfolio Internal Grading System Classification	13,702	13,940
Total for Portfolio | Consumer Loan
Loan Portfolio Internal Grading System Classification	53,348	57,350
Total for Portfolio | Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	120,696	121,352
Total for Portfolio | Acquired Loans Net of Discount
Loan Portfolio Internal Grading System Classification	161,125	167,651
Total for Portfolio | Loans Receivable
Loan Portfolio Internal Grading System Classification	$ 4,975,335	$ 4,993,251