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Note 8 - Acquisition of Guaranty Bank and Trust Company (Details Textual) |  |  | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 27, 2017 shares | Jun. 08, 2017 USD ($) $ / shares | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) | Jun. 30, 2016 USD ($)
Assets |  |  | $ 3,457,186,695 |  | $ 3,301,943,748 | $ 2,683,434,288
Deposits |  |  | $ 2,870,234,239 |  | $ 2,669,261,273 |
Share Price | $ / shares |  | $ 46.05 |  |  |  |
Term Note [Member] |  |  |  |  |  |
Debt Instrument, Term |  |  | 4 years |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 4.16% |  |  |
Term Note [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 3.00% |  |  |
Scenario, Forecast [Member] | Term Note [Member] |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  |  | $ 7,000,000 |  |
Guaranty Bank and Trust Company [Member] | Subsequent Event [Member] |  |  |  |  |  |
Stock Offering, Number of Shares | shares | 881,631 |  |  |  |  |
Community State Bank [Member] |  |  |  |  |  |
Business Combination, Valuation Input, Acquired Company's Adjusted Tangible Equity |  | $ 24,286,985 |  |  |  |
Business Combination, Valuation Input |  | 1.53 |  |  |  |
Community State Bank [Member] | Scenario, Forecast [Member] |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  | 37,200,000 |  |
Payments to Acquire Businesses, Gross |  |  |  | $ 7,800,000 |  |
Stock Issued During Period, Shares, Acquisitions | shares |  |  |  | 638,400 |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  |  |  | $ 29,400,000 |  |
Guaranty Bank and Trust Company [Member] |  |  |  |  |  |
Number of Branches |  | 5 |  |  |  |
Assets |  |  | $ 264,000,000 |  |  |
Deposits |  |  | $ 212,000,000 |  |  |

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