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Note 4: Acquired Loans, Loss Sharing Agreements and FDIC Indemnification Assets: Schedule of Changes in Accretable Yield for Acquired Loan Pools (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
TeamBank |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion |  | $ (3,265) |  | $ (4,138) |  | $ (9,473) |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference |  | 205 | [1] | 3,601 | [1] | 4,747 | [2]
TeamBank | Beginning of Period |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) |  |  |  |  |  | 12,128 |
TeamBank | End of Period |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) |  | 3,805 |  | 6,865 |  | 7,402 |
Vantus Bank |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion |  | (2,541) |  | (3,835) |  | (8,940) |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference |  | 1,448 | [1] | 2,563 | [1] | 1,127 | [2]
Vantus Bank | Beginning of Period |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) |  |  |  |  |  | 13,538 |
Vantus Bank | End of Period |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) |  | 3,360 |  | 4,453 |  | 5,725 |
Sun Security Bank |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion |  | (5,487) |  | (10,590) |  | (16,885) |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference |  | 3,459 | [1] | 7,429 | [1] | 16,739 | [2]
Sun Security Bank | Beginning of Period |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) |  |  |  |  |  | 11,259 |
Sun Security Bank | End of Period |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) |  | 5,924 |  | 7,952 |  | 11,113 |
InterBank |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion |  | (28,767) |  | (37,994) |  | (28,667) |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference |  | 9,022 | [1] | 33,991 | [1] | 26,188 | [2]
InterBank | Beginning of Period |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) |  |  |  |  |  | 42,574 |
InterBank | End of Period |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) |  | 16,347 |  | 36,092 |  | $ 40,095 |
Valley Bank |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion |  | (10,975) |  | (4,788) |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference | [1] | 8,159 |  | (7,056) |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Additions |  |  |  | 22,976 |  |  |
Valley Bank | End of Period |  |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) |  | $ 8,316 |  | $ 11,132 |  |  |
[1] | Represents increases in estimated cash flows expected to be received from the acquired loan pools, primarily due to lower estimated credit losses. The numbers also include changes in expected accretion of the loan pools for TeamBank, Vantus Bank, Sun Security Bank, InterBank and Valley Bank for the year ended December 31, 2015, totaling $40,000, $1.1 million, $2.0 million, $4.8 million and $759,000, respectively; for TeamBank, Vantus Bank, Sun Security Bank, InterBank and Valley Bank for the year ended December 31, 2014, totaling $3.2 million, $2.4 million, $3.9 million, $9.2 million and $(9.6 million), respectively; and for TeamBank, Vantus Bank, Sun Security Bank and InterBank for the year ended December 31, 2013, totaling $2.3 million, $611,000, $4.8 million and $146,000, respectively.
[2] | Represents increases in estimated cash flows expected to be received from the acquired loan pools, primarily due to lower estimated credit losses. The amounts also include changes in expected accretion of the loan pools for TeamBank, Vantus Bank, Sun Security Bank, InterBank and Valley Bank for the six months ended June 30, 2015, totaling $(176,000), $527,000, $1.1 million, $1.6 million and $344,000, respectively, and for the six months ended June 30, 2014, totaling $2.3 million, $984,000, $1.4 million, $1.7 million and $-0-, respectively.

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- Definition Amount of decrease from accretion of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Amount of additions to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Amount of increase (decrease) of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Amount of increase of reclassification from nonaccretable difference to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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