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Note 1 - Summary of Significant Accounting Policies (Details Textual) |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 23, 2017 USD ($) | Dec. 14, 2016 USD ($) | Nov. 17, 2016 USD ($) | Sep. 15, 2015 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Number of Reportable Segments |  |  |  |  |  | 1 |  |
FDIC Indemnification Asset, Cash Payments Received |  |  |  | $ 2,368,000 | $ 2,368,000 |  |  |
Gain (Loss) on Contract Termination |  |  |  | $ (7,476,000) | $ (7,476,000) |  | $ (7,476,000) |
Derivative Asset, Notional Amount |  |  |  |  |  | 99,200,000 | 61,300,000 |
Assets |  |  |  |  |  | 8,400,056,000 | 7,559,658,000 |
Loans and Leases Receivable, Net Amount |  |  |  |  |  | 5,596,604,000 | 4,888,004,000 |
Deposits |  |  |  |  |  | $ 6,735,219,000 | $ 6,086,096,000 |
Hardeman County Investment Company, Inc. [Member] |  |  |  |  |  |  |  |
Number of Bank Branches |  |  |  |  |  | 10 |  |
Assets |  |  |  |  |  | $ 477,000,000 |  |
Loans and Leases Receivable, Net Amount |  |  |  |  |  | 255,000,000 |  |
Deposits |  |  |  |  |  | $ 395,000,000 |  |
Southwest Bancorp, Inc. [Member] |  |  |  |  |  |  |  |
Number of Bank Branches |  |  |  |  |  | 31 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  | $ 2,500,000,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Acquired Not Covered by FDIC Loss Share |  |  |  |  |  | 1,900,000,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Total Deposits |  |  |  |  |  | $ 1,900,000,000 |  |
First Texas BHC, Inc. [Member] |  |  |  |  |  |  |  |
Number of Bank Branches |  |  |  |  |  | 16 |  |
Assets |  |  |  |  |  | $ 2,100,000,000 |  |
Loans and Leases Receivable, Net Amount |  |  |  |  |  | 1,800,000,000 |  |
Deposits |  |  |  |  |  | $ 1,700,000,000 |  |
Pending Acquisition, Hardeman County Investment Company, Inc. [Member] |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  | $ 72,200,000 |  |  |  |  |
Pending Acquisition, Southwest Bancorp, Inc. [Member] |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  | $ 564,400,000 |  |  |  |  |  |
Pending Acquisition, First Texas BHC, Inc. [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 462,000,000 |  |  |  |  |  |  |

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