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Note 12 - Borrowings (Details) - USD ($)		1 Months Ended	12 Months Ended
	Aug. 05, 2014	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Note 12 - Borrowings (Details) [Line Items]
Long-term Line of Credit			$ 112,159,000	$ 105,895,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances			0
Gains (Losses) on Extinguishment of Debt			(1,130,000)
Subordinated Notes [Member]
Note 12 - Borrowings (Details) [Line Items]
Proceeds from Issuance of Long-term Debt	$ 70,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.75%
Proceeds from Issuance of Subordinated Long-term Debt			68,800,000
Deferred Finance Costs, Net			1,200,000
Debt Instrument, Repurchase Amount			9,300,000
CDARS [Member]
Note 12 - Borrowings (Details) [Line Items]
Long-term Line of Credit			5,800,000
Line of Credit Facility, Maximum Borrowing Capacity			909,500,000
IND [Member]
Note 12 - Borrowings (Details) [Line Items]
Long-term Line of Credit			236,400,000
Line of Credit Facility, Maximum Borrowing Capacity			300,000,000
Federal Reserve Bank Of Richmond [Member]
Note 12 - Borrowings (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			408,000,000
Loan Agreement and Related Stock Security Agreement [Member]
Note 12 - Borrowings (Details) [Line Items]
Long-term Line of Credit			0	$ 0
Line of Credit Facility, Maximum Borrowing Capacity			$ 50,000,000
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum			3.50%
Loan Agreement and Related Stock Security Agreement [Member] | Prime Rate [Member]
Note 12 - Borrowings (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.25%
Federal Funds [Member]
Note 12 - Borrowings (Details) [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount			$ 137,500,000
Long-term Line of Credit			0
Gains (Losses) on Extinguishment of Debt		$ (1,100,000)
Maximum [Member]
Note 12 - Borrowings (Details) [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances			$ 731,100,000

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

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

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Fair value amount of debt instrument that was repurchased.

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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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For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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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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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.

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