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Note 12 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value On a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available of Sale Securities |  |
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available of Sale Securities | $ 55,622 | $ 56,975
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available of Sale Securities |  |
US Government Agencies Debt Securities [Member] |  |
Available of Sale Securities | $ 55,622 | $ 56,975
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available of Sale Securities |  |
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available of Sale Securities | $ 306,812 | $ 297,241
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available of Sale Securities |  |
Residential Mortgage Backed Securities [Member] |  |
Available of Sale Securities | $ 306,812 | $ 297,241
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available of Sale Securities |  |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available of Sale Securities | $ 109,909 | $ 118,381
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available of Sale Securities |  |
US States and Political Subdivisions Debt Securities [Member] |  |
Available of Sale Securities | $ 109,909 | $ 118,381
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available of Sale Securities |  |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available of Sale Securities | $ 14,938 | $ 14,938
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available of Sale Securities |  |
Corporate Debt Securities [Member] |  |
Available of Sale Securities | $ 14,938 | $ 14,938
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available of Sale Securities | $ 109 | $ 115
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available of Sale Securities |  |
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available of Sale Securities | $ 219 | $ 219
Equity Securities [Member] |  |
Available of Sale Securities | $ 328 | $ 334
Residential Mortgage Loan Long Term [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available of Sale Securities |  |
Residential Mortgage Loan Long Term [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available of Sale Securities | $ 45,679 | $ 47,492
Residential Mortgage Loan Long Term [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available of Sale Securities |  |
Residential Mortgage Loan Long Term [Member] |  |
Available of Sale Securities | $ 45,679 | $ 47,492
Mortgage Banking Derivative [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available of Sale Securities |  |
Mortgage Banking Derivative [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available of Sale Securities |  |
Mortgage Banking Derivative [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available of Sale Securities | $ 377 | $ 24
Mortgage Banking Derivative [Member] |  |
Available of Sale Securities | $ 377 | $ 24
Interest Rate Swap Derivative [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Available of Sale Securities |  |
Interest Rate Swap Derivative [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Available of Sale Securities |  |
Interest Rate Swap Derivative [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Available of Sale Securities |  |
Interest Rate Swap Derivative [Member] |  |
Available of Sale Securities |  |
Fair Value, Inputs, Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Mortgage Banking Derivative [Member] |  |
Liabilities fair value |  |
Fair Value, Inputs, Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member] |  |
Liabilities fair value |  |
Fair Value, Inputs, Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] |  |
Liabilities fair value |  |
Fair Value, Inputs, Level 1 [Member] |  |
Available of Sale Securities | $ 109 | $ 115
Liabilities fair value |  |
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Mortgage Banking Derivative [Member] |  |
Liabilities fair value |  |
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member] |  |
Liabilities fair value | $ 8,820 | $ 1,417
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] |  |
Liabilities fair value |  |
Fair Value, Inputs, Level 2 [Member] |  |
Available of Sale Securities | 532,960 | $ 535,027
Liabilities fair value | 8,820 | $ 1,417
Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Mortgage Banking Derivative [Member] |  |
Liabilities fair value | $ 306 |
Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member] |  |
Liabilities fair value |  |
Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] |  |
Liabilities fair value |  | $ 30
Fair Value, Inputs, Level 3 [Member] |  |
Available of Sale Securities | $ 596 | 243
Liabilities fair value | 306 | 30
Derivative Financial Instruments, Liabilities [Member] | Mortgage Banking Derivative [Member] |  |
Liabilities fair value | 306 |
Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member] |  |
Liabilities fair value | 8,820 | 1,417
Derivative Financial Instruments, Liabilities [Member] |  |
Liabilities fair value |  | 30
Available of Sale Securities | 533,665 | 535,385
Liabilities fair value | $ 9,126 | $ 1,447

X
- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
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Balance Type: |
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- Details
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Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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