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Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Investment securities available for sale: |  |
Available for Sale Securities | $ 560,236 |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis |  | $ 3,445
US Government Agencies Debt Securities [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities | 69,078 | 29,894
Residential Mortgage Backed Securities [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities | 322,020 | 240,320
US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities | 117,866 | 111,712
Corporate Debt Securities [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities | 15,018 |
Equity Securities [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities | 344 | 417
Loans Held for Sale Securities [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities | 35,713 | 44,317
Mortgage Banking Derivative [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities | 197 | 146
Interest Rate Swap [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities |  | 426,806
Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member] |  |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis |  | 3,445
Fair Value, Inputs, Level 1 [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities | 125 |
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities | 125 | 198
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities |  | 198
Fair Value, Inputs, Level 2 [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities | 559,695 |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis |  | 3,445
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities | 69,078 | 29,894
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Backed Securities [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities | 322,020 | 240,320
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities | 117,866 | 111,712
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities | 15,018 |
Fair Value, Inputs, Level 2 [Member] | Loans Held for Sale Securities [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities | 35,713 | 44,317
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities |  | 426,243
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member] |  |
Liabilities: |  |
Liabilities measured at fair value on a recurring basis |  | 3,445
Fair Value, Inputs, Level 3 [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities | 416 |
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities | 219 | 219
Fair Value, Inputs, Level 3 [Member] | Mortgage Banking Derivative [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities | $ 197 | 146
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] |  |
Investment securities available for sale: |  |
Available for Sale Securities |  | $ 365

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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