Note 3: Loans and Allowance for Loan Losses: Schedule of Loans Classified by Aging Analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Loans Receivable
Financing Receivables, By Class	$ 4,825,600	$ 4,353,294
Loans Receivable | Land and Land Improvements
Financing Receivables, By Class	44,492	43,971
Loans Receivable | One- to four-family residential construction
Financing Receivables, By Class	26,177	20,793
Loans Receivable | Subdivision construction
Financing Receivables, By Class	13,844	18,062
Loans Receivable | Commercial construction
Financing Receivables, By Class	1,417,166	1,068,352
Loans Receivable | Owner occupied one- to four-family residential
Financing Receivables, By Class	276,866	190,515
Loans Receivable | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	122,438	119,468
Loans Receivable | Commercial Real Estate
Financing Receivables, By Class	1,371,435	1,235,329
Loans Receivable | Other residential
Financing Receivables, By Class	784,894	745,645
Loans Receivable | Commercial business
Financing Receivables, By Class	322,118	353,351
Loans Receivable | Industrial revenue bonds
Financing Receivables, By Class	13,940	21,859
Loans Receivable | Automobile Loan
Financing Receivables, By Class	253,528	357,142
Loans Receivable | Consumer Loan
Financing Receivables, By Class	57,350	63,368
Loans Receivable | Home Equity Line of Credit
Financing Receivables, By Class	121,352	115,439
Loans Receivable | Acquired loans, net of discount
Financing Receivables, By Class	167,651	209,669
Financing Receivables, 30 to 59 Days Past Due | Land and Land Improvements
Financing Receivables, By Class	13	54
Financing Receivables, 30 to 59 Days Past Due | One- to four-family residential construction
Financing Receivables, By Class	0	250
Financing Receivables, 30 to 59 Days Past Due | Subdivision construction
Financing Receivables, By Class	0	0
Financing Receivables, 30 to 59 Days Past Due | Commercial construction
Financing Receivables, By Class	0	0
Financing Receivables, 30 to 59 Days Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	1,431	1,927
Financing Receivables, 30 to 59 Days Past Due | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	1,142	947
Financing Receivables, 30 to 59 Days Past Due | Commercial Real Estate
Financing Receivables, By Class	3,940	8,346
Financing Receivables, 30 to 59 Days Past Due | Other residential
Financing Receivables, By Class	0	540
Financing Receivables, 30 to 59 Days Past Due | Commercial business
Financing Receivables, By Class	72	2,623
Financing Receivables, 30 to 59 Days Past Due | Industrial revenue bonds
Financing Receivables, By Class	3	0
Financing Receivables, 30 to 59 Days Past Due | Automobile Loan
Financing Receivables, By Class	2,596	5,196
Financing Receivables, 30 to 59 Days Past Due | Consumer Loan
Financing Receivables, By Class	691	464
Financing Receivables, 30 to 59 Days Past Due | Home Equity Line of Credit
Financing Receivables, By Class	229	58
Financing Receivables, 30 to 59 Days Past Due | Acquired loans, net of discount
Financing Receivables, By Class	2,195	4,449
Financing Receivables, 30 to 59 Days Past Due | Loans Receivable
Financing Receivables, By Class	10,117	20,405
Financing Receivables, 60 to 89 Days Past Due | Land and Land Improvements
Financing Receivables, By Class	0	37
Financing Receivables, 60 to 89 Days Past Due | One- to four-family residential construction
Financing Receivables, By Class	0	0
Financing Receivables, 60 to 89 Days Past Due | Subdivision construction
Financing Receivables, By Class	0	0
Financing Receivables, 60 to 89 Days Past Due | Commercial construction
Financing Receivables, By Class	0	0
Financing Receivables, 60 to 89 Days Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	806	71
Financing Receivables, 60 to 89 Days Past Due | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	144	190
Financing Receivables, 60 to 89 Days Past Due | Commercial Real Estate
Financing Receivables, By Class	53	993
Financing Receivables, 60 to 89 Days Past Due | Other residential
Financing Receivables, By Class	0	353
Financing Receivables, 60 to 89 Days Past Due | Commercial business
Financing Receivables, By Class	54	1,282
Financing Receivables, 60 to 89 Days Past Due | Industrial revenue bonds
Financing Receivables, By Class	0	0
Financing Receivables, 60 to 89 Days Past Due | Automobile Loan
Financing Receivables, By Class	722	1,230
Financing Receivables, 60 to 89 Days Past Due | Consumer Loan
Financing Receivables, By Class	181	64
Financing Receivables, 60 to 89 Days Past Due | Home Equity Line of Credit
Financing Receivables, By Class	0	0
Financing Receivables, 60 to 89 Days Past Due | Acquired loans, net of discount
Financing Receivables, By Class	1,416	1,951
Financing Receivables, 60 to 89 Days Past Due | Loans Receivable
Financing Receivables, By Class	1,960	4,220
Financing Receivables Over 90 Days Past Due | Land and Land Improvements
Financing Receivables, By Class	49	0
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	98
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	1,206	904
Financing Receivables Over 90 Days Past Due | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	1,458	1,816
Financing Receivables Over 90 Days Past Due | Commercial Real Estate
Financing Receivables, By Class	334	1,226
Financing Receivables Over 90 Days Past Due | Other residential
Financing Receivables, By Class	0	1,877
Financing Receivables Over 90 Days Past Due | Commercial business
Financing Receivables, By Class	1,437	2,063
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	1,490	2,284
Financing Receivables Over 90 Days Past Due | Consumer Loan
Financing Receivables, By Class	240	557
Financing Receivables Over 90 Days Past Due | Home Equity Line of Credit
Financing Receivables, By Class	86	430
Financing Receivables Over 90 Days Past Due | Acquired loans, net of discount
Financing Receivables, By Class	6,827	10,675
Financing Receivables Over 90 Days Past Due | Loans Receivable
Financing Receivables, By Class	6,300	11,255
Financing Receivables Past Due | Land and Land Improvements
Financing Receivables, By Class	62	91
Financing Receivables Past Due | One- to four-family residential construction
Financing Receivables, By Class	0	250
Financing Receivables Past Due | Subdivision construction
Financing Receivables, By Class	0	98
Financing Receivables Past Due | Commercial construction
Financing Receivables, By Class	0	0
Financing Receivables Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	3,443	2,902
Financing Receivables Past Due | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	2,744	2,953
Financing Receivables Past Due | Commercial Real Estate
Financing Receivables, By Class	4,327	10,565
Financing Receivables Past Due | Other residential
Financing Receivables, By Class	0	2,770
Financing Receivables Past Due | Commercial business
Financing Receivables, By Class	1,563	5,968
Financing Receivables Past Due | Industrial revenue bonds
Financing Receivables, By Class	3	0
Financing Receivables Past Due | Automobile Loan
Financing Receivables, By Class	4,808	8,710
Financing Receivables Past Due | Consumer Loan
Financing Receivables, By Class	1,112	1,085
Financing Receivables Past Due | Home Equity Line of Credit
Financing Receivables, By Class	315	488
Financing Receivables Past Due | Acquired loans, net of discount
Financing Receivables, By Class	10,438	17,075
Financing Receivables Past Due | Loans Receivable
Financing Receivables, By Class	18,377	35,880
Financing Receivables Current | Land and Land Improvements
Financing Receivables, By Class	44,430	43,880
Financing Receivables Current | One- to four-family residential construction
Financing Receivables, By Class	26,177	20,543
Financing Receivables Current | Subdivision construction
Financing Receivables, By Class	13,844	17,964
Financing Receivables Current | Commercial construction
Financing Receivables, By Class	1,417,166	1,068,352
Financing Receivables Current | Owner occupied one- to four-family residential
Financing Receivables, By Class	273,423	187,613
Financing Receivables Current | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	119,694	116,515
Financing Receivables Current | Commercial Real Estate
Financing Receivables, By Class	1,367,108	1,224,764
Financing Receivables Current | Other residential
Financing Receivables, By Class	784,894	742,875
Financing Receivables Current | Commercial business
Financing Receivables, By Class	320,555	347,383
Financing Receivables Current | Industrial revenue bonds
Financing Receivables, By Class	13,937	21,859
Financing Receivables Current | Automobile Loan
Financing Receivables, By Class	248,720	348,432
Financing Receivables Current | Consumer Loan
Financing Receivables, By Class	56,238	62,283
Financing Receivables Current | Home Equity Line of Credit
Financing Receivables, By Class	121,037	114,951
Financing Receivables Current | Acquired loans, net of discount
Financing Receivables, By Class	157,213	192,594
Financing Receivables Current | Loans Receivable
Financing Receivables, By Class	4,807,223	4,317,414
Financing Receivables, Equal to Greater than 90 Days Past Due | Land and Land Improvements
Financing Receivables, By Class	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | One- to four-family residential construction
Financing Receivables, By Class	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Subdivision construction
Financing Receivables, By Class	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial construction
Financing Receivables, By Class	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Owner occupied one- to four-family residential
Financing Receivables, By Class	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Non-owner occupied one- to four-family residential
Financing Receivables, By Class	0	58
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Real Estate
Financing Receivables, By Class	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Other residential
Financing Receivables, By Class	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial business
Financing Receivables, By Class	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Industrial revenue bonds
Financing Receivables, By Class	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Automobile Loan
Financing Receivables, By Class	0	12
Financing Receivables, Equal to Greater than 90 Days Past Due | Consumer Loan
Financing Receivables, By Class	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Home Equity Line of Credit
Financing Receivables, By Class	0	26
Financing Receivables, Equal to Greater than 90 Days Past Due | Acquired loans, net of discount
Financing Receivables, By Class	0	272
Financing Receivables, Equal to Greater than 90 Days Past Due | Loans Receivable
Financing Receivables, By Class	$ 0	$ 96