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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
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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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
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- Details

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- Details

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- Details

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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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- Details

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Balance Type:
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- Details

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- Details

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Period Type:

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- Details

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