Note 3: Loans and Allowance for Loan Losses: Schedule of Loans Classified by Aging Analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans Receivable
Financing Receivables, By Class	$ 4,924,840	$ 4,825,600
Loans Receivable \| Land and Land Improvements
Financing Receivables, By Class	40,431	44,492
Loans Receivable \| One- to four-family residential construction
Financing Receivables, By Class	33,963	26,177
Loans Receivable \| Subdivision construction
Financing Receivables, By Class	16,088	13,844
Loans Receivable \| Commercial construction
Financing Receivables, By Class	1,322,861	1,417,166
Loans Receivable \| Owner occupied one- to four-family residential
Financing Receivables, By Class	387,016	276,866
Loans Receivable \| Non-owner occupied one- to four-family residential
Financing Receivables, By Class	120,343	122,438
Loans Receivable \| Commercial Real Estate
Financing Receivables, By Class	1,494,172	1,371,435
Loans Receivable \| Other residential
Financing Receivables, By Class	866,006	784,894
Loans Receivable \| Commercial business
Financing Receivables, By Class	313,209	322,118
Loans Receivable \| Industrial revenue bonds
Financing Receivables, By Class	13,189	13,940
Loans Receivable \| Automobile Loan
Financing Receivables, By Class	151,854	253,528
Loans Receivable \| Consumer Loan
Financing Receivables, By Class	46,720	57,350
Loans Receivable \| Home Equity Line of Credit
Financing Receivables, By Class	118,988	121,352
Loans Receivable \| Acquired loans, net of discount
Financing Receivables, By Class	127,206	167,651
Loans Receivable \| Loans receivable, gross
Financing Receivables, By Class	5,052,046	4,993,251
Loans Receivable \| Less: Acquired loans, net of discount
Financing Receivables, By Class	127,206	167,651
Financial Asset, 30 to 59 Days Past Due \| Land and Land Improvements
Financing Receivables, By Class	0	13
Financial Asset, 30 to 59 Days Past Due \| One- to four-family residential construction
Financing Receivables, By Class	0	0
Financial Asset, 30 to 59 Days Past Due \| Subdivision construction
Financing Receivables, By Class	0	0
Financial Asset, 30 to 59 Days Past Due \| Commercial construction
Financing Receivables, By Class	15,085	0
Financial Asset, 30 to 59 Days Past Due \| Owner occupied one- to four-family residential
Financing Receivables, By Class	1,453	1,431
Financial Asset, 30 to 59 Days Past Due \| Non-owner occupied one- to four-family residential
Financing Receivables, By Class	152	1,142
Financial Asset, 30 to 59 Days Past Due \| Commercial Real Estate
Financing Receivables, By Class	549	3,940
Financial Asset, 30 to 59 Days Past Due \| Other residential
Financing Receivables, By Class	376	0
Financial Asset, 30 to 59 Days Past Due \| Commercial business
Financing Receivables, By Class	60	72
Financial Asset, 30 to 59 Days Past Due \| Industrial revenue bonds
Financing Receivables, By Class	0	3
Financial Asset, 30 to 59 Days Past Due \| Automobile Loan
Financing Receivables, By Class	1,101	2,596
Financial Asset, 30 to 59 Days Past Due \| Consumer Loan
Financing Receivables, By Class	278	691
Financial Asset, 30 to 59 Days Past Due \| Home Equity Line of Credit
Financing Receivables, By Class	296	229
Financial Asset, 30 to 59 Days Past Due \| Acquired loans, net of discount
Financing Receivables, By Class	2,177	2,195
Financial Asset, 30 to 59 Days Past Due \| Loans receivable, gross
Financing Receivables, By Class	21,527	12,312
Financial Asset, 30 to 59 Days Past Due \| Less: Acquired loans, net of discount
Financing Receivables, By Class	2,177	2,195
Financial Asset, 30 to 59 Days Past Due \| Loans Receivable
Financing Receivables, By Class	19,350	10,117
Financial Asset, 60 to 89 Days Past Due \| Land and Land Improvements
Financing Receivables, By Class	27	0
Financial Asset, 60 to 89 Days Past Due \| One- to four-family residential construction
Financing Receivables, By Class	0	0
Financial Asset, 60 to 89 Days Past Due \| Subdivision construction
Financing Receivables, By Class	0	0
Financial Asset, 60 to 89 Days Past Due \| Commercial construction
Financing Receivables, By Class	0	0
Financial Asset, 60 to 89 Days Past Due \| Owner occupied one- to four-family residential
Financing Receivables, By Class	1,631	806
Financial Asset, 60 to 89 Days Past Due \| Non-owner occupied one- to four-family residential
Financing Receivables, By Class	0	144
Financial Asset, 60 to 89 Days Past Due \| Commercial Real Estate
Financing Receivables, By Class	119	53
Financial Asset, 60 to 89 Days Past Due \| Other residential
Financing Receivables, By Class	0	0
Financial Asset, 60 to 89 Days Past Due \| Commercial business
Financing Receivables, By Class	0	54
Financial Asset, 60 to 89 Days Past Due \| Industrial revenue bonds
Financing Receivables, By Class	0	0
Financial Asset, 60 to 89 Days Past Due \| Automobile Loan
Financing Receivables, By Class	259	722
Financial Asset, 60 to 89 Days Past Due \| Consumer Loan
Financing Receivables, By Class	233	181
Financial Asset, 60 to 89 Days Past Due \| Home Equity Line of Credit
Financing Receivables, By Class	0	0
Financial Asset, 60 to 89 Days Past Due \| Acquired loans, net of discount
Financing Receivables, By Class	709	1,416
Financial Asset, 60 to 89 Days Past Due \| Loans receivable, gross
Financing Receivables, By Class	2,978	3,376
Financial Asset, 60 to 89 Days Past Due \| Less: Acquired loans, net of discount
Financing Receivables, By Class	709	1,416
Financial Asset, 60 to 89 Days Past Due \| Loans Receivable
Financing Receivables, By Class	2,269	1,960
Financing Receivables Over 90 Days Past Due \| Land and Land Improvements
Financing Receivables, By Class	0	49
Financing Receivables Over 90 Days Past Due \| One- to four-family residential construction
Financing Receivables, By Class	0	0
Financing Receivables Over 90 Days Past Due \| Subdivision construction
Financing Receivables, By Class	0	0
Financing Receivables Over 90 Days Past Due \| Commercial construction
Financing Receivables, By Class	0	0
Financing Receivables Over 90 Days Past Due \| Owner occupied one- to four-family residential
Financing Receivables, By Class	1,198	1,206
Financing Receivables Over 90 Days Past Due \| Non-owner occupied one- to four-family residential
Financing Receivables, By Class	181	1,458
Financing Receivables Over 90 Days Past Due \| Commercial Real Estate
Financing Receivables, By Class	632	334
Financing Receivables Over 90 Days Past Due \| Other residential
Financing Receivables, By Class	0	0
Financing Receivables Over 90 Days Past Due \| Commercial business
Financing Receivables, By Class	1,235	1,437
Financing Receivables Over 90 Days Past Due \| Industrial revenue bonds
Financing Receivables, By Class	0	0
Financing Receivables Over 90 Days Past Due \| Automobile Loan
Financing Receivables, By Class	558	1,490
Financing Receivables Over 90 Days Past Due \| Consumer Loan
Financing Receivables, By Class	198	240
Financing Receivables Over 90 Days Past Due \| Home Equity Line of Credit
Financing Receivables, By Class	517	86
Financing Receivables Over 90 Days Past Due \| Acquired loans, net of discount
Financing Receivables, By Class	6,191	6,827
Financing Receivables Over 90 Days Past Due \| Loans receivable, gross
Financing Receivables, By Class	10,710	13,127
Financing Receivables Over 90 Days Past Due \| Less: Acquired loans, net of discount
Financing Receivables, By Class	6,191	6,827
Financing Receivables Over 90 Days Past Due \| Loans Receivable
Financing Receivables, By Class	4,519	6,300
Financing Receivables Past Due \| Land and Land Improvements
Financing Receivables, By Class	27	62
Financing Receivables Past Due \| One- to four-family residential construction
Financing Receivables, By Class	0	0
Financing Receivables Past Due \| Subdivision construction
Financing Receivables, By Class	0	0
Financing Receivables Past Due \| Commercial construction
Financing Receivables, By Class	15,085	0
Financing Receivables Past Due \| Owner occupied one- to four-family residential
Financing Receivables, By Class	4,282	3,443
Financing Receivables Past Due \| Non-owner occupied one- to four-family residential
Financing Receivables, By Class	333	2,744
Financing Receivables Past Due \| Commercial Real Estate
Financing Receivables, By Class	1,300	4,327
Financing Receivables Past Due \| Other residential
Financing Receivables, By Class	376	0
Financing Receivables Past Due \| Commercial business
Financing Receivables, By Class	1,295	1,563
Financing Receivables Past Due \| Industrial revenue bonds
Financing Receivables, By Class	0	3
Financing Receivables Past Due \| Automobile Loan
Financing Receivables, By Class	1,918	4,808
Financing Receivables Past Due \| Consumer Loan
Financing Receivables, By Class	709	1,112
Financing Receivables Past Due \| Home Equity Line of Credit
Financing Receivables, By Class	813	315
Financing Receivables Past Due \| Acquired loans, net of discount
Financing Receivables, By Class	9,077	10,438
Financing Receivables Past Due \| Loans receivable, gross
Financing Receivables, By Class	35,215	28,815
Financing Receivables Past Due \| Less: Acquired loans, net of discount
Financing Receivables, By Class	9,077	10,438
Financing Receivables Past Due \| Loans Receivable
Financing Receivables, By Class	26,138	18,377
Financing Receivables Current \| Land and Land Improvements
Financing Receivables, By Class	40,404	44,430
Financing Receivables Current \| One- to four-family residential construction
Financing Receivables, By Class	33,963	26,177
Financing Receivables Current \| Subdivision construction
Financing Receivables, By Class	16,088	13,844
Financing Receivables Current \| Commercial construction
Financing Receivables, By Class	1,307,776	1,417,166
Financing Receivables Current \| Owner occupied one- to four-family residential
Financing Receivables, By Class	382,734	273,423
Financing Receivables Current \| Non-owner occupied one- to four-family residential
Financing Receivables, By Class	120,010	119,694
Financing Receivables Current \| Commercial Real Estate
Financing Receivables, By Class	1,492,872	1,367,108
Financing Receivables Current \| Other residential
Financing Receivables, By Class	865,630	784,894
Financing Receivables Current \| Commercial business
Financing Receivables, By Class	311,914	320,555
Financing Receivables Current \| Industrial revenue bonds
Financing Receivables, By Class	13,189	13,937
Financing Receivables Current \| Automobile Loan
Financing Receivables, By Class	149,936	248,720
Financing Receivables Current \| Consumer Loan
Financing Receivables, By Class	46,011	56,238
Financing Receivables Current \| Home Equity Line of Credit
Financing Receivables, By Class	118,175	121,037
Financing Receivables Current \| Acquired loans, net of discount
Financing Receivables, By Class	118,129	157,213
Financing Receivables Current \| Loans receivable, gross
Financing Receivables, By Class	5,016,831	4,964,436
Financing Receivables Current \| Less: Acquired loans, net of discount
Financing Receivables, By Class	118,129	157,213
Financing Receivables Current \| Loans Receivable
Financing Receivables, By Class	4,898,702	4,807,223
Financial Asset, Equal to or Greater than 90 Days Past Due \| Land and Land Improvements
Financing Receivables, By Class	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| One- to four-family residential construction
Financing Receivables, By Class	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Subdivision construction
Financing Receivables, By Class	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Commercial construction
Financing Receivables, By Class	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Owner occupied one- to four-family residential
Financing Receivables, By Class	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Non-owner occupied one- to four-family residential
Financing Receivables, By Class	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Commercial Real Estate
Financing Receivables, By Class	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Other residential
Financing Receivables, By Class	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Commercial business
Financing Receivables, By Class	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Industrial revenue bonds
Financing Receivables, By Class	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Automobile Loan
Financing Receivables, By Class	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Consumer Loan
Financing Receivables, By Class	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Home Equity Line of Credit
Financing Receivables, By Class	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Acquired loans, net of discount
Financing Receivables, By Class	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Loans receivable, gross
Financing Receivables, By Class	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Less: Acquired loans, net of discount
Financing Receivables, By Class	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due \| Loans Receivable
Financing Receivables, By Class	$ 0	$ 0

Note 3: Loans and Allowance for Loan Losses: Schedule of Loans Classified by Aging Analysis (Details) - USD ($)
$ in Thousands

Dec. 31, 2019

Dec. 31, 2018

Loans Receivable

Financing Receivables, By Class

$ 4,924,840

$ 4,825,600

Loans Receivable | Land and Land Improvements

Financing Receivables, By Class

40,431

44,492

Loans Receivable | One- to four-family residential construction