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Note O - Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Inputs, Level 1 [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Assets measured on a recurring basis
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Assets measured on a nonrecurring basis
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Assets measured on a nonrecurring basis
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | Commercial Portfolio Segment [Member]
Assets measured on a nonrecurring basis
Fair Value, Inputs, Level 1 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Assets measured on a recurring basis
Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Assets measured on a nonrecurring basis
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Assets measured on a recurring basis	10,544	8,965
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Assets measured on a nonrecurring basis
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Assets measured on a nonrecurring basis
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Commercial Portfolio Segment [Member]
Assets measured on a nonrecurring basis
Fair Value, Inputs, Level 2 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Assets measured on a recurring basis	85,946	82,686
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Assets measured on a nonrecurring basis
Fair Value, Inputs, Level 3 [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Assets measured on a recurring basis
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Assets measured on a nonrecurring basis	3,536
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Assets measured on a nonrecurring basis	1,985	2,473
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Commercial Portfolio Segment [Member]
Assets measured on a nonrecurring basis	298	3,779
Fair Value, Inputs, Level 3 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Assets measured on a recurring basis
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Assets measured on a nonrecurring basis	$ 754	$ 1,147

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring 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

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_
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- Details

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- Details

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- Details

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- Details

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