Note 3: Loans and Allowance for Loan Losses: Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Satisfactory | Loans Receivable
Loan Portfolio Internal Grading System Classification	$ 5,005,765	$ 4,958,837
Satisfactory | Land and Land Improvements
Loan Portfolio Internal Grading System Classification	40,431	39,892
Satisfactory | One- to four-family residential construction
Loan Portfolio Internal Grading System Classification	33,963	25,803
Satisfactory | Subdivision construction
Loan Portfolio Internal Grading System Classification	16,061	12,077
Satisfactory | Commercial construction
Loan Portfolio Internal Grading System Classification	1,322,861	1,417,166
Satisfactory | Owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	385,001	274,661
Satisfactory | Non-owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	119,743	119,951
Satisfactory | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	1,458,400	1,357,987
Satisfactory | Other residential
Loan Portfolio Internal Grading System Classification	866,006	784,393
Satisfactory | Commercial business
Loan Portfolio Internal Grading System Classification	307,322	315,518
Satisfactory | Industrial revenue bonds
Loan Portfolio Internal Grading System Classification	13,189	13,940
Satisfactory | Automobile Loan
Loan Portfolio Internal Grading System Classification	150,874	251,824
Satisfactory | Consumer Loan
Loan Portfolio Internal Grading System Classification	46,294	56,859
Satisfactory | Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	118,428	121,134
Satisfactory | Acquired loans, net of discount
Loan Portfolio Internal Grading System Classification	127,192	167,632
Watch | Loans Receivable
Loan Portfolio Internal Grading System Classification	37,368	24,792
Watch | Land and Land Improvements
Loan Portfolio Internal Grading System Classification	0	4,600
Watch | One- to four-family residential construction
Loan Portfolio Internal Grading System Classification	0	374
Watch | Subdivision construction
Loan Portfolio Internal Grading System Classification	27	1,718
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	26	43
Watch | Non-owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	419	941
Watch | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	32,063	11,061
Watch | Other residential
Loan Portfolio Internal Grading System Classification	0	501
Watch | Commercial business
Loan Portfolio Internal Grading System Classification	4,651	5,163
Watch | Industrial revenue bonds
Loan Portfolio Internal Grading System Classification	0	0
Watch | Automobile Loan
Loan Portfolio Internal Grading System Classification	47	116
Watch | Consumer Loan
Loan Portfolio Internal Grading System Classification	92	157
Watch | Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	43	118
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 | Land and 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 | 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 | Automobile Loan
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
Substandard | Loans Receivable
Loan Portfolio Internal Grading System Classification	8,913	9,622
Substandard | Land and 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	0	49
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	1,989	2,162
Substandard | Non-owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	181	1,546
Substandard | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	3,709	2,387
Substandard | Other residential
Loan Portfolio Internal Grading System Classification	0	0
Substandard | Commercial business
Loan Portfolio Internal Grading System Classification	1,236	1,437
Substandard | Industrial revenue bonds
Loan Portfolio Internal Grading System Classification	0	0
Substandard | Automobile Loan
Loan Portfolio Internal Grading System Classification	933	1,588
Substandard | Consumer Loan
Loan Portfolio Internal Grading System Classification	334	334
Substandard | Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	517	100
Substandard | Acquired loans, net of discount
Loan Portfolio Internal Grading System Classification	14	19
Doubtful | Loans Receivable
Loan Portfolio Internal Grading System Classification	0	0
Doubtful | Land and 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 | 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 | Automobile Loan
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
Loan grading system, total | Loans Receivable
Loan Portfolio Internal Grading System Classification	5,052,046	4,993,251
Loan grading system, total | Land and Land Improvements
Loan Portfolio Internal Grading System Classification	40,431	44,492
Loan grading system, total | One- to four-family residential construction
Loan Portfolio Internal Grading System Classification	33,963	26,177
Loan grading system, total | Subdivision construction
Loan Portfolio Internal Grading System Classification	16,088	13,844
Loan grading system, total | Commercial construction
Loan Portfolio Internal Grading System Classification	1,322,861	1,417,166
Loan grading system, total | Owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	387,016	276,866
Loan grading system, total | Non-owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	120,343	122,438
Loan grading system, total | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	1,494,172	1,371,435
Loan grading system, total | Other residential
Loan Portfolio Internal Grading System Classification	866,006	784,894
Loan grading system, total | Commercial business
Loan Portfolio Internal Grading System Classification	313,209	322,118
Loan grading system, total | Industrial revenue bonds
Loan Portfolio Internal Grading System Classification	13,189	13,940
Loan grading system, total | Automobile Loan
Loan Portfolio Internal Grading System Classification	151,854	253,528
Loan grading system, total | Consumer Loan
Loan Portfolio Internal Grading System Classification	46,720	57,350
Loan grading system, total | Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	118,988	121,352
Loan grading system, total | Acquired loans, net of discount
Loan Portfolio Internal Grading System Classification	$ 127,206	$ 167,651