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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. + Details
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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. + Details
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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 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=82894507&loc=d3e13503-111538 + Details
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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=82894903&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=82894507&loc=d3e13503-111538 + Details
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