NOTE 6: LOANS AND ALLOWANCE FOR LOAN LOSSES: Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Satisfactory \| Loans Receivable
Loan Portfolio Internal Grading System Classification	$ 5,052,905	$ 5,005,765
Satisfactory \| Commercial Loan
Loan Portfolio Internal Grading System Classification	1,220,037	1,322,861
Satisfactory \| Commercial Real Estate
Loan Portfolio Internal Grading System Classification	1,491,772	1,458,400
Satisfactory \| Industrial revenue bonds
Loan Portfolio Internal Grading System Classification	14,324	13,189
Satisfactory \| Automobile Loan
Loan Portfolio Internal Grading System Classification	130,702	150,874
Satisfactory \| Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	121,137	118,428
Satisfactory \| Land Improvements
Loan Portfolio Internal Grading System Classification	38,507	40,431
Satisfactory \| One- to four-family residential construction
Loan Portfolio Internal Grading System Classification	33,410	33,963
Satisfactory \| Subdivision construction
Loan Portfolio Internal Grading System Classification	14,579	16,061
Satisfactory \| Owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	422,157	385,001
Satisfactory \| Non-owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	121,419	119,743
Satisfactory \| Other residential
Loan Portfolio Internal Grading System Classification	964,353	866,006
Satisfactory \| Commercial Borrower
Loan Portfolio Internal Grading System Classification	318,856	307,322
Satisfactory \| Consumer Borrower
Loan Portfolio Internal Grading System Classification	44,485	46,294
Satisfactory \| Acquired loans net of discount
Loan Portfolio Internal Grading System Classification	117,167	127,192
Watch \| Loans Receivable
Loan Portfolio Internal Grading System Classification	34,129	37,368
Watch \| Commercial Loan
Loan Portfolio Internal Grading System Classification	0	0
Watch \| Commercial Real Estate
Loan Portfolio Internal Grading System Classification	31,837	32,063
Watch \| Industrial revenue bonds
Loan Portfolio Internal Grading System Classification	0	0
Watch \| Automobile Loan
Loan Portfolio Internal Grading System Classification	35	47
Watch \| Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	43	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	0	0
Watch \| Subdivision construction
Loan Portfolio Internal Grading System Classification	25	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	322	419
Watch \| Other residential
Loan Portfolio Internal Grading System Classification	0	0
Watch \| Commercial Borrower
Loan Portfolio Internal Grading System Classification	1,778	4,651
Watch \| Consumer Borrower
Loan Portfolio Internal Grading System Classification	89	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	9,505	8,913
Substandard \| Commercial Loan
Loan Portfolio Internal Grading System Classification	0	0
Substandard \| Commercial Real Estate
Loan Portfolio Internal Grading System Classification	3,804	3,709
Substandard \| Industrial revenue bonds
Loan Portfolio Internal Grading System Classification	0	0
Substandard \| Automobile Loan
Loan Portfolio Internal Grading System Classification	846	933
Substandard \| Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	464	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	0	0
Substandard \| Owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	2,621	1,989
Substandard \| Non-owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	268	181
Substandard \| Other residential
Loan Portfolio Internal Grading System Classification	0	0
Substandard \| Commercial Borrower
Loan Portfolio Internal Grading System Classification	1,199	1,236
Substandard \| Consumer Borrower
Loan Portfolio Internal Grading System Classification	261	334
Substandard \| Acquired loans net of discount
Loan Portfolio Internal Grading System Classification	42	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	5,096,539	5,052,046
Internal Investment Grade Total \| Commercial Loan
Loan Portfolio Internal Grading System Classification	1,220,037	1,322,861
Internal Investment Grade Total \| Commercial Real Estate
Loan Portfolio Internal Grading System Classification	1,527,413	1,494,172
Internal Investment Grade Total \| Industrial revenue bonds
Loan Portfolio Internal Grading System Classification	14,324	13,189
Internal Investment Grade Total \| Automobile Loan
Loan Portfolio Internal Grading System Classification	131,583	151,854
Internal Investment Grade Total \| Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	121,644	118,988
Internal Investment Grade Total \| Land Improvements
Loan Portfolio Internal Grading System Classification	38,507	40,431
Internal Investment Grade Total \| One- to four-family residential construction
Loan Portfolio Internal Grading System Classification	33,410	33,963
Internal Investment Grade Total \| Subdivision construction
Loan Portfolio Internal Grading System Classification	14,604	16,088
Internal Investment Grade Total \| Owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	424,778	387,016
Internal Investment Grade Total \| Non-owner occupied one- to four-family residential
Loan Portfolio Internal Grading System Classification	122,009	120,343
Internal Investment Grade Total \| Other residential
Loan Portfolio Internal Grading System Classification	964,353	866,006
Internal Investment Grade Total \| Commercial Borrower
Loan Portfolio Internal Grading System Classification	321,833	313,209
Internal Investment Grade Total \| Consumer Borrower
Loan Portfolio Internal Grading System Classification	44,835	46,720
Internal Investment Grade Total \| Acquired loans net of discount
Loan Portfolio Internal Grading System Classification	$ 117,209	$ 127,206

NOTE 6: LOANS AND ALLOWANCE FOR LOAN LOSSES: Financing Receivable Credit Quality Indicators (Details) - USD ($)
$ in Thousands

Mar. 31, 2020

Dec. 31, 2019

Satisfactory | Loans Receivable

Loan Portfolio Internal Grading System Classification

$ 5,052,905

$ 5,005,765

Satisfactory | Commercial Loan

Loan Portfolio Internal Grading System Classification

1,220,037

1,322,861

Satisfactory | Commercial Real Estate