Note 7: Loans and Allowance For Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Satisfactory | One To Four Family Residential Construction
Loan Portfolio Internal Grading System Classification	$ 43,163	$ 34,364
Satisfactory | Subdivision Construction
Loan Portfolio Internal Grading System Classification	33,310	36,524
Satisfactory | Land Development
Loan Portfolio Internal Grading System Classification	37,514	45,606
Satisfactory | Commercial Construction
Loan Portfolio Internal Grading System Classification	361,971	184,019
Satisfactory | Owner Occupied One To Four Family Residential
Loan Portfolio Internal Grading System Classification	76,166	84,931
Satisfactory | Non-Owner Occupied One To Four Family Residential
Loan Portfolio Internal Grading System Classification	139,070	137,003
Satisfactory | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	808,064	727,668
Satisfactory | Other Residential
Loan Portfolio Internal Grading System Classification	341,224	311,320
Satisfactory | Commercial Business
Loan Portfolio Internal Grading System Classification	347,691	307,540
Satisfactory | Industrial Revenue Bonds
Loan Portfolio Internal Grading System Classification	41,114	39,532
Satisfactory | Consumer Loans Auto Financing Receivable
Loan Portfolio Internal Grading System Classification	274,079	134,516
Satisfactory | Consumer Other Financing Receivable
Loan Portfolio Internal Grading System Classification	78,149	81,769
Satisfactory | Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	60,707	57,713
Satisfactory | FDIC Supported Loans Net Of Discounts TeamBank
Loan Portfolio Internal Grading System Classification	15,275	49,702
Satisfactory | Acquired non-covered loans, net of discounts (TeamBank)
Loan Portfolio Internal Grading System Classification	28,333
Satisfactory | FDIC Supported Loans Net Of Discounts Vantus Bank
Loan Portfolio Internal Grading System Classification	43,252	57,290
Satisfactory | FDIC Supported Loans Net Of Discounts Sun Security Bank
Loan Portfolio Internal Grading System Classification	53,859	63,360
Satisfactory | FDIC Supported Loans Net Of Discounts InterBank
Loan Portfolio Internal Grading System Classification	202,904	213,539
Satisfactory | Acquired loans not covered by FDIC loss sharing agreements, net of discounts (Valley Bank)
Loan Portfolio Internal Grading System Classification	152,497
Satisfactory | Loans Receivable
Loan Portfolio Internal Grading System Classification	3,138,342	2,566,396
Watch | One To Four Family Residential Construction
Loan Portfolio Internal Grading System Classification		298
Watch | Subdivision Construction
Loan Portfolio Internal Grading System Classification	21	706
Watch | Land Development
Loan Portfolio Internal Grading System Classification	5,000	1,148
Watch | Owner Occupied One To Four Family Residential
Loan Portfolio Internal Grading System Classification	611	503
Watch | Non-Owner Occupied One To Four Family Residential
Loan Portfolio Internal Grading System Classification	350	6,718
Watch | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	51,967	37,937
Watch | Other Residential
Loan Portfolio Internal Grading System Classification	10,045	12,323
Watch | Commercial Business
Loan Portfolio Internal Grading System Classification	446	1,803
Watch | Industrial Revenue Bonds
Loan Portfolio Internal Grading System Classification	622	675
Watch | Consumer Other Financing Receivable
Loan Portfolio Internal Grading System Classification	4	6
Watch | Loans Receivable
Loan Portfolio Internal Grading System Classification	69,066	62,117
Substandard | One To Four Family Residential Construction
Loan Portfolio Internal Grading System Classification	223
Substandard | Subdivision Construction
Loan Portfolio Internal Grading System Classification	2,013	3,179
Substandard | Land Development
Loan Portfolio Internal Grading System Classification	6,067	11,087
Substandard | Owner Occupied One To Four Family Residential
Loan Portfolio Internal Grading System Classification	2,207	3,699
Substandard | Non-Owner Occupied One To Four Family Residential
Loan Portfolio Internal Grading System Classification	3,994	2,187
Substandard | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	12,263	15,085
Substandard | Other Residential
Loan Portfolio Internal Grading System Classification	1,956	1,956
Substandard | Commercial Business
Loan Portfolio Internal Grading System Classification	1,250	3,528
Substandard | Industrial Revenue Bonds
Loan Portfolio Internal Grading System Classification	1,205	2,023
Substandard | Consumer Loans Auto Financing Receivable
Loan Portfolio Internal Grading System Classification	171	201
Substandard | Consumer Other Financing Receivable
Loan Portfolio Internal Grading System Classification	523	485
Substandard | Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	445	570
Substandard | FDIC Supported Loans Net Of Discounts TeamBank
Loan Portfolio Internal Grading System Classification	19	160
Substandard | Acquired non-covered loans, net of discounts (TeamBank)
Loan Portfolio Internal Grading System Classification	8
Substandard | FDIC Supported Loans Net Of Discounts Vantus Bank
Loan Portfolio Internal Grading System Classification	401	630
Substandard | FDIC Supported Loans Net Of Discounts Sun Security Bank
Loan Portfolio Internal Grading System Classification	535	1,483
Substandard | FDIC Supported Loans Net Of Discounts InterBank
Loan Portfolio Internal Grading System Classification	883
Substandard | Loans Receivable
Loan Portfolio Internal Grading System Classification	34,163	46,273
Doubtful | Commercial Business
Loan Portfolio Internal Grading System Classification		2,398
Doubtful | Loans Receivable
Loan Portfolio Internal Grading System Classification		2,398
Total For Portfolio | One To Four Family Residential Construction
Loan Portfolio Internal Grading System Classification	43,386	34,662
Total For Portfolio | Subdivision Construction
Loan Portfolio Internal Grading System Classification	35,344	40,409
Total For Portfolio | Land Development
Loan Portfolio Internal Grading System Classification	48,581	57,841
Total For Portfolio | Commercial Construction
Loan Portfolio Internal Grading System Classification	361,971	184,019
Total For Portfolio | Owner Occupied One To Four Family Residential
Loan Portfolio Internal Grading System Classification	78,984	89,133
Total For Portfolio | Non-Owner Occupied One To Four Family Residential
Loan Portfolio Internal Grading System Classification	143,414	145,908
Total For Portfolio | Commercial Real Estate
Loan Portfolio Internal Grading System Classification	872,294	780,690
Total For Portfolio | Other Residential
Loan Portfolio Internal Grading System Classification	353,225	325,599
Total For Portfolio | Commercial Business
Loan Portfolio Internal Grading System Classification	349,387	315,269
Total For Portfolio | Industrial Revenue Bonds
Loan Portfolio Internal Grading System Classification	42,941	42,230
Total For Portfolio | Consumer Loans Auto Financing Receivable
Loan Portfolio Internal Grading System Classification	274,250	134,717
Total For Portfolio | Consumer Other Financing Receivable
Loan Portfolio Internal Grading System Classification	78,676	82,260
Total For Portfolio | Home Equity Line of Credit
Loan Portfolio Internal Grading System Classification	61,152	58,283
Total For Portfolio | FDIC Supported Loans Net Of Discounts TeamBank
Loan Portfolio Internal Grading System Classification	15,294	49,862
Total For Portfolio | Acquired non-covered loans, net of discounts (TeamBank)
Loan Portfolio Internal Grading System Classification	28,341
Total For Portfolio | FDIC Supported Loans Net Of Discounts Vantus Bank
Loan Portfolio Internal Grading System Classification	43,653	57,920
Total For Portfolio | FDIC Supported Loans Net Of Discounts Sun Security Bank
Loan Portfolio Internal Grading System Classification	54,394	64,843
Total For Portfolio | FDIC Supported Loans Net Of Discounts InterBank
Loan Portfolio Internal Grading System Classification	203,787	213,539
Total For Portfolio | Acquired loans not covered by FDIC loss sharing agreements, net of discounts (Valley Bank)
Loan Portfolio Internal Grading System Classification	152,497
Total For Portfolio | Loans Receivable
Loan Portfolio Internal Grading System Classification	$ 3,241,571	$ 2,677,184