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Note 5 - 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	Sep. 09, 2016	Feb. 27, 2015	Aug. 31, 2014
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
Delta Trust [Member]
Contractually required principal and interest at acquisition			$ 316,103
Non-accretable difference (expected losses and foregone interest)
Cash flows expected to be collected at acquisition			316,103
Accretable yield			(7,949)
Basis in acquired loans at acquisition			308,154
Delta Trust [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Contractually required principal and interest at acquisition			10,726
Non-accretable difference (expected losses and foregone interest)			(7,023)
Cash flows expected to be collected at acquisition			3,703
Accretable yield			(177)
Basis in acquired loans at acquisition			$ 3,526

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

No definition available.

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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=6379141&loc=d3e15032-111544

Reference 2: 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

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- Definition

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=6379141&loc=d3e15032-111544

Reference 2: 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

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- Definition

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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-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

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