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Note 2 - Acquisitions (Details Textual) |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 09, 2016 USD ($) shares | Oct. 29, 2015 USD ($) shares | Feb. 28, 2015 shares | Feb. 27, 2015 USD ($) shares | Aug. 31, 2014 USD ($) shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2016 USD ($) | Oct. 28, 2015 USD ($)
Goodwill |  |  |  |  |  |  | $ 327,686,000 |  | $ 348,505,000 |
Business Percentage of Fair Value Adjustment Deferred Tax Asset |  |  |  |  |  |  |  |  | 39.225% |
Citizens National Bank [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares |  | 835,741 |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  | $ 41,300,000 |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 35,000,000 |  |  |  |  |  |  |  |
Number of Bank Branches |  | 9 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | $ 585,500,000 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share |  | 340,850,000 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits |  | 509,857,000 |  |  |  |  |  |  |  |
Goodwill |  | $ 21,495,000 |  |  |  |  |  |  |  |
Liberty Bancshares, Inc. [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares |  |  |  |  | 5,181,337 |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  |  |  |  | $ 212,200,000 |  |  |  |  |
Number of Bank Branches |  |  |  |  | 24 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  | $ 1,066,272,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share |  |  |  |  | 780,658,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits |  |  |  |  | 874,714,000 |  |  |  |  |
Goodwill |  |  |  |  | $ 95,207,000 |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  |  | 46,000,000 |  |  |
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  |  |  | 24,200,000 |  |  |
Community First Bancshares Inc [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares |  |  |  |  | 6,552,915 |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  |  |  |  | $ 268,300,000 |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  | $ 9,974 |  |  |  |  |
Number of Bank Branches |  |  |  |  | 33 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  | $ 1,915,061,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share |  |  |  |  | 1,136,543,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits |  |  |  |  | 1,536,062,000 |  |  |  |  |
Goodwill |  |  |  |  | $ 110,440,000 |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  |  | 77,300,000 |  |  |
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  |  |  | 33,300,000 |  |  |
Community First Bancshares Inc [Member] | Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares |  |  |  |  | 30,852 |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  |  |  |  | $ 30,900,000 |  |  |  |  |
Liberty and Community First [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  | 7,400,000 |  |  |
Business Acquisition, Pro Forma Revenue | [1] |  |  |  |  |  | 395,959,000 | $ 390,606,000 |  |
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  |  |  | $ 85,773,000 | $ 64,166,000 |  |
OTIC and TCO [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares |  |  | 339,290 |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  |  | $ 17,900,000 |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | 5,800,000 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  | 14,895,000 |  |  |  |  |  |  |
Goodwill |  |  | $ 13,268,000 |  |  |  |  |  |  |
Assets under Management, Carrying Amount |  |  |  |  |  |  |  |  |  | $ 1,000,000,000
Number of Investment in Shares Repurchased Through Acquisition | shares |  |  |  | 1,000 |  |  |  |  |  |
Delta Trust [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares |  |  |  |  |  | 1,629,515 |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  |  |  |  |  | $ 65,000,000 |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  | $ 2,400,000 |  |  |  |
Number of Bank Branches |  |  |  |  |  | 9 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  | $ 417,386,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share |  |  |  |  |  | 311,680,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits |  |  |  |  |  | 355,362,000 |  |  |  |
Goodwill |  |  |  |  |  | $ 29,022,000 |  |  |  |
[1] | Net interest income plus noninterest income.

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- Definition Represents loans acquired not covered by FDIC loss share assumed in business acquisition. + References No definition available. + Details
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- Definition Number of investment in shares in particular company, which is later acquired by the invested company itself, so number of invested shares been repurchased through process of acquisition. + References No definition available. + Details
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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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