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Note 12 - Borrowings (Details Textual) - USD ($)			1 Months Ended	12 Months Ended
	Jul. 26, 2016	Aug. 05, 2014	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Long-term Line of Credit				$ 94,375,000	$ 112,159,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances				0
Proceeds from Issuance of Subordinated Long-term Debt	$ 147,350,000	$ 68,800,000
Gain (Loss) on Extinguishment of Debt					(1,130,000)
Subordinated Debt [Member]
Debt Instrument, Interest Rate, Stated Percentage	5.00%	5.75%
Debt Instrument, Face Amount	$ 150,000,000	$ 70,000,000
Payments of Debt Issuance Costs	$ 2,600,000	$ 1,200,000
Debt Instrument, Repurchase Amount					9,300,000
Maximum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances				1,250,000,000
C D A R S [Member]
Line of Credit Facility, Maximum Borrowing Capacity				1,030,000,000
Long-term Line of Credit				19,900,000
I N D [Member]
Line of Credit Facility, Maximum Borrowing Capacity				700,000,000
Long-term Line of Credit				356,500,000
Federal Reserve Bank of Richmond [Member]
Line of Credit Facility, Maximum Borrowing Capacity				440,000,000
Loan Agreement and Related Stock Security Agreement [Member]
Line of Credit Facility, Maximum Borrowing Capacity				50,000,000
Long-term Line of Credit				$ 0	$ 0
Loan Agreement and Related Stock Security Agreement [Member] | Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate				0.25%
Loan Agreement and Related Stock Security Agreement [Member] | Minimum [Member]
Debt Instrument, Interest Rate, Stated Percentage				3.50%
Federal Funds [Member]
Debt Instrument, Unused Borrowing Capacity, Amount				$ 137,500,000
Long-term Line of Credit				$ 0
Gain (Loss) on Extinguishment of Debt			$ 1,100,000

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Fair value amount of debt instrument that was repurchased.

+ References

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- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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- Definition

Amount of advances from the Federal Home Loan Bank (FHLB).

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral.

+ References

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