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Note 6 - Loans Acquired - Summary of the Non-covered Impaired Loans Acquired in Acquisitions - Loans Acquired, Not Covered By FDIC Loss Share (Details) - Loans Acquired, Not Covered By FDIC Loss Share [Member] - USD ($) $ in Thousands	Oct. 19, 2017	May 15, 2017	Sep. 09, 2016	Feb. 27, 2015
OKSB Merger [Member]
Contractually required principal and interest at acquisition	$ 2,021,388
Non-accretable difference (expected losses and foregone interest)
Cash flows expected to be collected at acquisition	2,021,388
Accretable yield	(36,340)
Basis in acquired loans at acquisition	1,985,048
OKSB Merger [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Contractually required principal and interest at acquisition	18,136
Non-accretable difference (expected losses and foregone interest)	(6,731)
Cash flows expected to be collected at acquisition	11,405
Accretable yield
Basis in acquired loans at acquisition	11,405
First Texas Merger [Member]
Contractually required principal and interest at acquisition	2,246,212
Non-accretable difference (expected losses and foregone interest)
Cash flows expected to be collected at acquisition	2,246,212
Accretable yield	(37,834)
Basis in acquired loans at acquisition	2,208,378
First Texas Merger [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Contractually required principal and interest at acquisition
Non-accretable difference (expected losses and foregone interest)
Cash flows expected to be collected at acquisition
Accretable yield
Basis in acquired loans at acquisition
Hardeman County Investment Company, Inc. [Member]
Contractually required principal and interest at acquisition		$ 254,189
Non-accretable difference (expected losses and foregone interest)
Cash flows expected to be collected at acquisition		254,189
Accretable yield		(5,002)
Basis in acquired loans at acquisition		249,187
Hardeman County Investment Company, Inc. [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Contractually required principal and interest at acquisition		3,452
Non-accretable difference (expected losses and foregone interest)		(990)
Cash flows expected to be collected at acquisition		2,462
Accretable yield
Basis in acquired loans at acquisition		$ 2,462
Citizens National Bank [Member]
Contractually required principal and interest at acquisition			$ 348,756
Non-accretable difference (expected losses and foregone interest)
Cash flows expected to be collected at acquisition			348,756
Accretable yield			(8,663)
Basis in acquired loans at acquisition			340,093
Citizens National Bank [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Contractually required principal and interest at acquisition			1,605
Non-accretable difference (expected losses and foregone interest)			(848)
Cash flows expected to be collected at acquisition			757
Accretable yield
Basis in acquired loans at acquisition			$ 757
Liberty Bancshares, Inc. [Member]
Contractually required principal and interest at acquisition				$ 774,777
Non-accretable difference (expected losses and foregone interest)
Cash flows expected to be collected at acquisition				774,777
Accretable yield				(4,869)
Basis in acquired loans at acquisition				769,908
Liberty Bancshares, Inc. [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Contractually required principal and interest at acquisition				15,716
Non-accretable difference (expected losses and foregone interest)				(4,978)
Cash flows expected to be collected at acquisition				10,738
Accretable yield				12
Basis in acquired loans at acquisition				10,750
Community First Bancshares Inc [Member]
Contractually required principal and interest at acquisition				1,153,255
Non-accretable difference (expected losses and foregone interest)
Cash flows expected to be collected at acquisition				1,153,255
Accretable yield				(23,712)
Basis in acquired loans at acquisition				1,129,543
Community First Bancshares Inc [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Contractually required principal and interest at acquisition				10,143
Non-accretable difference (expected losses and foregone interest)				(3,247)
Cash flows expected to be collected at acquisition				6,896
Accretable yield				104
Basis in acquired loans at acquisition				$ 7,000

X

- Definition

The aggregate excess (deficiency) of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

No definition available.

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- Definition

The amount of the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

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- Definition

Amount of cash flows expected to be collected at acquisition of 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 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

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-Name Accounting Standards Codification
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Amount of contractually required payments receivable at acquisition of 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 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

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The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

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