Note 3: Loans and Allowance For Loan Losses: Classes of Loans by Aging (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivables, 30 to 59 Days Past Due | One To Four Family Residential Construction
Financing Receivables	$ 250	$ 0
Financing Receivables, 30 to 59 Days Past Due | Subdivision Construction
Financing Receivables	0	0
Financing Receivables, 30 to 59 Days Past Due | Land Development
Financing Receivables	54	413
Financing Receivables, 30 to 59 Days Past Due | Commercial Construction
Financing Receivables	0	0
Financing Receivables, 30 to 59 Days Past Due | Owner Occupied One To Four Family Residential
Financing Receivables	1,927	1,760
Financing Receivables, 30 to 59 Days Past Due | Non-Owner Occupied One To Four Family Residential
Financing Receivables	947	309
Financing Receivables, 30 to 59 Days Past Due | Commercial Real Estate
Financing Receivables	8,346	1,969
Financing Receivables, 30 to 59 Days Past Due | Other Residential
Financing Receivables	540	4,632
Financing Receivables, 30 to 59 Days Past Due | Commercial Business
Financing Receivables	2,623	1,741
Financing Receivables, 30 to 59 Days Past Due | Industrial Revenue Bonds
Financing Receivables	0	0
Financing Receivables, 30 to 59 Days Past Due | Automobile Loan
Financing Receivables	5,196	8,252
Financing Receivables, 30 to 59 Days Past Due | Consumer Loan
Financing Receivables	464	1,103
Financing Receivables, 30 to 59 Days Past Due | Home Equity Line of Credit
Financing Receivables	58	136
Financing Receivables, 30 to 59 Days Past Due | Acquired Loans No Longer Covered By FDIC Loss Sharing Agreements Net Of Discounts
Financing Receivables	4,015	1,356
Financing Receivables, 30 to 59 Days Past Due | Acquired Non-Covered Loans Net Of Discounts
Financing Receivables	434	851
Financing Receivables, 30 to 59 Days Past Due | Loans Receivable Gross
Financing Receivables	24,854	26,998
Financing Receivables, 30 to 59 Days Past Due | Less acquired loans no longer covered by FDIC loss sharing agreements and acquired non-covered loans, net of discounts
Financing Receivables	4,449
Financing Receivables, 30 to 59 Days Past Due | Loans Receivable
Financing Receivables	20,405	20,315
Financing Receivables, 30 to 59 Days Past Due | Acquired FDIC Covered Loans Net of Discount
Financing Receivables		4,476
Financing Receivables, 30 to 59 Days Past Due | Less FDIC Supported Loans And Acquired Not Covered Loans Net Of Discounts
Financing Receivables		6,683
Financing Receivables, 60 to 89 Days Past Due | One To Four Family Residential Construction
Financing Receivables	0	0
Financing Receivables, 60 to 89 Days Past Due | Subdivision Construction
Financing Receivables	0	0
Financing Receivables, 60 to 89 Days Past Due | Land Development
Financing Receivables	37	584
Financing Receivables, 60 to 89 Days Past Due | Commercial Construction
Financing Receivables	0	0
Financing Receivables, 60 to 89 Days Past Due | Owner Occupied One To Four Family Residential
Financing Receivables	71	388
Financing Receivables, 60 to 89 Days Past Due | Non-Owner Occupied One To Four Family Residential
Financing Receivables	190	278
Financing Receivables, 60 to 89 Days Past Due | Commercial Real Estate
Financing Receivables	993	1,988
Financing Receivables, 60 to 89 Days Past Due | Other Residential
Financing Receivables	353	0
Financing Receivables, 60 to 89 Days Past Due | Commercial Business
Financing Receivables	1,282	24
Financing Receivables, 60 to 89 Days Past Due | Industrial Revenue Bonds
Financing Receivables	0	0
Financing Receivables, 60 to 89 Days Past Due | Automobile Loan
Financing Receivables	1,230	2,451
Financing Receivables, 60 to 89 Days Past Due | Consumer Loan
Financing Receivables	64	278
Financing Receivables, 60 to 89 Days Past Due | Home Equity Line of Credit
Financing Receivables	0	158
Financing Receivables, 60 to 89 Days Past Due | Acquired Loans No Longer Covered By FDIC Loss Sharing Agreements Net Of Discounts
Financing Receivables	1,774	552
Financing Receivables, 60 to 89 Days Past Due | Acquired Non-Covered Loans Net Of Discounts
Financing Receivables	177	173
Financing Receivables, 60 to 89 Days Past Due | Loans Receivable Gross
Financing Receivables	6,171	8,075
Financing Receivables, 60 to 89 Days Past Due | Less acquired loans no longer covered by FDIC loss sharing agreements and acquired non-covered loans, net of discounts
Financing Receivables	1,951
Financing Receivables, 60 to 89 Days Past Due | Loans Receivable
Financing Receivables	4,220	6,149
Financing Receivables, 60 to 89 Days Past Due | Acquired FDIC Covered Loans Net of Discount
Financing Receivables		1,201
Financing Receivables, 60 to 89 Days Past Due | Less FDIC Supported Loans And Acquired Not Covered Loans Net Of Discounts
Financing Receivables		1,926
Financing Receivables, Equal to Greater than 90 Days Past Due | One To Four Family Residential Construction
Financing Receivables	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Subdivision Construction
Financing Receivables	98	109
Financing Receivables, Equal to Greater than 90 Days Past Due | Land Development
Financing Receivables	0	1,718
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Construction
Financing Receivables	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Owner Occupied One To Four Family Residential
Financing Receivables	904	1,125
Financing Receivables, Equal to Greater than 90 Days Past Due | Non-Owner Occupied One To Four Family Residential
Financing Receivables	1,816	404
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Real Estate
Financing Receivables	1,226	4,404
Financing Receivables, Equal to Greater than 90 Days Past Due | Other Residential
Financing Receivables	1,877	162
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Business
Financing Receivables	2,063	3,088
Financing Receivables, Equal to Greater than 90 Days Past Due | Industrial Revenue Bonds
Financing Receivables	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Automobile Loan
Financing Receivables	2,284	1,989
Financing Receivables, Equal to Greater than 90 Days Past Due | Consumer Loan
Financing Receivables	557	649
Financing Receivables, Equal to Greater than 90 Days Past Due | Home Equity Line of Credit
Financing Receivables	430	433
Financing Receivables, Equal to Greater than 90 Days Past Due | Acquired Loans No Longer Covered By FDIC Loss Sharing Agreements Net Of Discounts
Financing Receivables	7,847	1,401
Financing Receivables, Equal to Greater than 90 Days Past Due | Acquired Non-Covered Loans Net Of Discounts
Financing Receivables	2,828	2,854
Financing Receivables, Equal to Greater than 90 Days Past Due | Loans Receivable Gross
Financing Receivables	21,930	26,562
Financing Receivables, Equal to Greater than 90 Days Past Due | Less acquired loans no longer covered by FDIC loss sharing agreements and acquired non-covered loans, net of discounts
Financing Receivables	10,675
Financing Receivables, Equal to Greater than 90 Days Past Due | Loans Receivable
Financing Receivables	11,255	14,081
Financing Receivables, Equal to Greater than 90 Days Past Due | Acquired FDIC Covered Loans Net of Discount
Financing Receivables		8,226
Financing Receivables, Equal to Greater than 90 Days Past Due | Less FDIC Supported Loans And Acquired Not Covered Loans Net Of Discounts
Financing Receivables		12,481
Financing Receivables Past Due | One To Four Family Residential Construction
Financing Receivables	250	0
Financing Receivables Past Due | Subdivision Construction
Financing Receivables	98	109
Financing Receivables Past Due | Land Development
Financing Receivables	91	2,715
Financing Receivables Past Due | Commercial Construction
Financing Receivables	0	0
Financing Receivables Past Due | Owner Occupied One To Four Family Residential
Financing Receivables	2,902	3,273
Financing Receivables Past Due | Non-Owner Occupied One To Four Family Residential
Financing Receivables	2,953	991
Financing Receivables Past Due | Commercial Real Estate
Financing Receivables	10,565	8,361
Financing Receivables Past Due | Other Residential
Financing Receivables	2,770	4,794
Financing Receivables Past Due | Commercial Business
Financing Receivables	5,968	4,853
Financing Receivables Past Due | Industrial Revenue Bonds
Financing Receivables	0	0
Financing Receivables Past Due | Automobile Loan
Financing Receivables	8,710	12,692
Financing Receivables Past Due | Consumer Loan
Financing Receivables	1,085	2,030
Financing Receivables Past Due | Home Equity Line of Credit
Financing Receivables	488	727
Financing Receivables Past Due | Acquired Loans No Longer Covered By FDIC Loss Sharing Agreements Net Of Discounts
Financing Receivables	13,636	3,309
Financing Receivables Past Due | Acquired Non-Covered Loans Net Of Discounts
Financing Receivables	3,439	3,878
Financing Receivables Past Due | Loans Receivable Gross
Financing Receivables	52,955	61,635
Financing Receivables Past Due | Less acquired loans no longer covered by FDIC loss sharing agreements and acquired non-covered loans, net of discounts
Financing Receivables	17,075
Financing Receivables Past Due | Loans Receivable
Financing Receivables	35,880	40,545
Financing Receivables Past Due | Acquired FDIC Covered Loans Net of Discount
Financing Receivables		13,903
Financing Receivables Past Due | Less FDIC Supported Loans And Acquired Not Covered Loans Net Of Discounts
Financing Receivables		21,090
Financing Receivables Current | One To Four Family Residential Construction
Financing Receivables	20,543	21,737
Financing Receivables Current | Subdivision Construction
Financing Receivables	17,964	17,077
Financing Receivables Current | Land Development
Financing Receivables	43,880	47,909
Financing Receivables Current | Commercial Construction
Financing Receivables	1,068,352	780,614
Financing Receivables Current | Owner Occupied One To Four Family Residential
Financing Receivables	187,613	197,067
Financing Receivables Current | Non-Owner Occupied One To Four Family Residential
Financing Receivables	116,515	135,933
Financing Receivables Current | Commercial Real Estate
Financing Receivables	1,224,764	1,178,545
Financing Receivables Current | Other Residential
Financing Receivables	742,875	658,584
Financing Receivables Current | Commercial Business
Financing Receivables	347,383	343,775
Financing Receivables Current | Industrial Revenue Bonds
Financing Receivables	21,859	25,065
Financing Receivables Current | Automobile Loan
Financing Receivables	348,432	481,541
Financing Receivables Current | Consumer Loan
Financing Receivables	62,283	67,971
Financing Receivables Current | Home Equity Line of Credit
Financing Receivables	114,951	108,026
Financing Receivables Current | Acquired Loans No Longer Covered By FDIC Loss Sharing Agreements Net Of Discounts
Financing Receivables	141,588	69,260
Financing Receivables Current | Acquired Non-Covered Loans Net Of Discounts
Financing Receivables	51,006	72,356
Financing Receivables Current | Loans Receivable Gross
Financing Receivables	4,510,008	4,325,913
Financing Receivables Current | Less acquired loans no longer covered by FDIC loss sharing agreements and acquired non-covered loans, net of discounts
Financing Receivables	192,594
Financing Receivables Current | Loans Receivable
Financing Receivables	4,317,414	4,063,844
Financing Receivables Current | Acquired FDIC Covered Loans Net of Discount
Financing Receivables		120,453
Financing Receivables Current | Less FDIC Supported Loans And Acquired Not Covered Loans Net Of Discounts
Financing Receivables		262,069
Financing Receivables Total | One To Four Family Residential Construction
Financing Receivables	20,793	21,737
Financing Receivables Total | Subdivision Construction
Financing Receivables	18,062	17,186
Financing Receivables Total | Land Development
Financing Receivables	43,971	50,624
Financing Receivables Total | Commercial Construction
Financing Receivables	1,068,352	780,614
Financing Receivables Total | Owner Occupied One To Four Family Residential
Financing Receivables	190,515	200,340
Financing Receivables Total | Non-Owner Occupied One To Four Family Residential
Financing Receivables	119,468	136,924
Financing Receivables Total | Commercial Real Estate
Financing Receivables	1,235,329	1,186,906
Financing Receivables Total | Other Residential
Financing Receivables	745,645	663,378
Financing Receivables Total | Commercial Business
Financing Receivables	353,351	348,628
Financing Receivables Total | Industrial Revenue Bonds
Financing Receivables	21,859	25,065
Financing Receivables Total | Automobile Loan
Financing Receivables	357,142	494,233
Financing Receivables Total | Consumer Loan
Financing Receivables	63,368	70,001
Financing Receivables Total | Home Equity Line of Credit
Financing Receivables	115,439	108,753
Financing Receivables Total | Acquired Loans No Longer Covered By FDIC Loss Sharing Agreements Net Of Discounts
Financing Receivables	155,224	72,569
Financing Receivables Total | Acquired Non-Covered Loans Net Of Discounts
Financing Receivables	54,445	76,234
Financing Receivables Total | Loans Receivable Gross
Financing Receivables	4,562,963	4,387,548
Financing Receivables Total | Less acquired loans no longer covered by FDIC loss sharing agreements and acquired non-covered loans, net of discounts
Financing Receivables	209,669
Financing Receivables Total | Loans Receivable
Financing Receivables	4,353,294	4,104,389
Financing Receivables Total | Acquired FDIC Covered Loans Net of Discount
Financing Receivables		134,356
Financing Receivables Total | Less FDIC Supported Loans And Acquired Not Covered Loans Net Of Discounts
Financing Receivables		283,159
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | One To Four Family Residential Construction
Financing Receivables	0	0
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Subdivision Construction
Financing Receivables	0	0
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Land Development
Financing Receivables	0	0
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Commercial Construction
Financing Receivables	0	0
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Owner Occupied One To Four Family Residential
Financing Receivables	0	0
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Non-Owner Occupied One To Four Family Residential
Financing Receivables	58	0
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Commercial Real Estate
Financing Receivables	0	0
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Other Residential
Financing Receivables	0	0
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Commercial Business
Financing Receivables	0	0
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Industrial Revenue Bonds
Financing Receivables	0	0
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Automobile Loan
Financing Receivables	12	0
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Consumer Loan
Financing Receivables	0	0
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Home Equity Line of Credit
Financing Receivables	26	0
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Acquired Loans No Longer Covered By FDIC Loss Sharing Agreements Net Of Discounts
Financing Receivables	116	222
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Acquired Non-Covered Loans Net Of Discounts
Financing Receivables	156	0
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Loans Receivable Gross
Financing Receivables	368	523
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Less acquired loans no longer covered by FDIC loss sharing agreements and acquired non-covered loans, net of discounts
Financing Receivables	272
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Loans Receivable
Financing Receivables	$ 96	0
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Acquired FDIC Covered Loans Net of Discount
Financing Receivables		301
Financing Receivables Greater Than 90 Days Past Due and Still Accruing | Less FDIC Supported Loans And Acquired Not Covered Loans Net Of Discounts
Financing Receivables		$ 523