Note 10 - Fair Value Measurements (Details) - Fair Values of Financial Instruments (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Assets
Cash and due from banks, carrying value	$ 9,997,000us-gaap_CashAndDueFromBanks	$ 9,097,000us-gaap_CashAndDueFromBanks	$ 8,982,000us-gaap_CashAndDueFromBanks
Cash and due from banks, fair value	9,997,000	9,097,000
Federal funds sold, carrying value	2,700,000us-gaap_FederalFundsSold	3,516,000us-gaap_FederalFundsSold	8,468,000us-gaap_FederalFundsSold
Federal funds sold, fair value	2,700,000us-gaap_FederalFundsSold	3,516,000us-gaap_FederalFundsSold	8,468,000us-gaap_FederalFundsSold
Interest bearing deposits with other banks, carrying value	402,964,000us-gaap_InterestBearingDepositsInBanks	243,412,000us-gaap_InterestBearingDepositsInBanks	213,501,000us-gaap_InterestBearingDepositsInBanks
Interest bearing deposits with other banks, fair value	402,964,000us-gaap_InterestBearingDepositsInBanks	243,412,000us-gaap_InterestBearingDepositsInBanks	213,501,000us-gaap_InterestBearingDepositsInBanks
Investment securities, carrying value	333,531,000us-gaap_AvailableForSaleSecurities	382,343,000us-gaap_AvailableForSaleSecurities	387,790,000us-gaap_AvailableForSaleSecurities
Investment securities, fair value	333,531,000us-gaap_AvailableForSaleSecurities	382,343,000us-gaap_AvailableForSaleSecurities	387,790,000us-gaap_AvailableForSaleSecurities
Federal Reserve and Federal Home Loan Bank stock, carrying value	16,793,000us-gaap_RestrictedInvestments	22,560,000us-gaap_RestrictedInvestments
Federal Reserve and Federal Home Loan Bank stock, fair value	16,793,000	22,560,000
Loans held for sale, carrying value	62,758,000us-gaap_LoansReceivableHeldForSaleNet	44,317,000us-gaap_LoansReceivableHeldForSaleNet	21,862,000us-gaap_LoansReceivableHeldForSaleNet
Loans held for sale, fair value	63,074,000	44,669,000
Loans, carrying value	4,444,893,000	4,312,399,000	3,063,975,000
Loans, fair value	4,447,182,000	4,314,618,000
Bank owned life insurance, carrying value	56,983,000us-gaap_BankOwnedLifeInsurance	56,594,000us-gaap_BankOwnedLifeInsurance	40,052,000us-gaap_BankOwnedLifeInsurance
Bank owned life insurance, fair value	56,983,000us-gaap_BankOwnedLifeInsurance	56,594,000us-gaap_BankOwnedLifeInsurance	40,052,000us-gaap_BankOwnedLifeInsurance
Annuity investment, carrying value	12,269,000	11,277,000
Annuity investment, fair value	12,269,000	11,277,000
Derivative assets, carrying value	219,000us-gaap_DerivativeAssets	146,000us-gaap_DerivativeAssets	0us-gaap_DerivativeAssets
Derivative assets, fair value	219,000us-gaap_DerivativeAssets	146,000us-gaap_DerivativeAssets	0us-gaap_DerivativeAssets
Liabilities
Deposits, carrying value	4,584,365,000us-gaap_Deposits	4,310,768,000us-gaap_Deposits	3,273,689,000us-gaap_Deposits
Borrowings, carrying value	137,889,000us-gaap_OtherBorrowings	280,420,000us-gaap_OtherBorrowings
Borrowings, fair value	138,386,000	281,958,000
Derivative liabilities	140,000us-gaap_DerivativeLiabilities	250,000us-gaap_DerivativeLiabilities	0us-gaap_DerivativeLiabilities
Fair Value, Inputs, Level 1 [Member]
Assets
Investment securities, carrying value	245,000	198,000
Investment securities, fair value	245,000	198,000
Fair Value, Inputs, Level 2 [Member] \| Noninterest-bearing Deposits [Member]
Liabilities
Deposits, fair value	1,196,165,000	1,175,799,000
Fair Value, Inputs, Level 2 [Member] \| Interest-bearing Deposits [Member]
Liabilities
Deposits, fair value	3,387,995,000	3,134,295,000
Fair Value, Inputs, Level 2 [Member]
Assets
Cash and due from banks, fair value	9,997,000	9,097,000
Federal funds sold, carrying value	2,700,000	3,516,000
Federal funds sold, fair value	2,700,000	3,516,000
Interest bearing deposits with other banks, carrying value	402,964,000	243,412,000
Interest bearing deposits with other banks, fair value	402,964,000	243,412,000
Investment securities, carrying value	333,067,000	381,926,000
Investment securities, fair value	333,067,000	381,926,000
Federal Reserve and Federal Home Loan Bank stock, fair value	16,793,000	22,560,000
Loans held for sale, fair value	63,074,000	44,669,000
Loans, fair value	4,060,000	1,489,000
Bank owned life insurance, carrying value	56,983,000	56,594,000
Bank owned life insurance, fair value	56,983,000	56,594,000
Annuity investment, fair value	12,269,000	11,277,000
Derivative assets, carrying value	219,000	146,000
Derivative assets, fair value	219,000	146,000
Liabilities
Borrowings, fair value	138,386,000	281,958,000
Fair Value, Inputs, Level 3 [Member]
Assets
Investment securities, carrying value	219,000	219,000
Investment securities, fair value	219,000	219,000
Loans, fair value	4,443,122,000	4,313,129,000
Liabilities
Derivative liabilities	140,000	250,000
Noninterest-bearing Deposits [Member]
Liabilities
Deposits, carrying value	1,196,165,000	1,175,799,000
Deposits, fair value	1,196,165,000	1,175,799,000
Interest-bearing Deposits [Member]
Liabilities
Deposits, carrying value	3,388,200,000	3,134,969,000
Deposits, fair value	$ 3,387,995,000	$ 3,134,295,000

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

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Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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The amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements.

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For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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No definition available.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Amount classified as loans attributable to disposal group held for sale or disposed of. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

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The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

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Fair value portion of other liabilities.

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No definition available.

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Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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No definition available.

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The aggregate value of all restricted investments.

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