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Note 9 - Fair Value Measurements (Detail) - Fair value estimates for financial instruments, excluding financial instruments recorded at fair value on a recurring basis (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Cash and due from banks	$ 355,459	$ 491,382
Investment securities held to maturity	1,162,358	1,156,041
Loans	2,006,580	2,081,123
Other assets - FDIC receivable	12,162	13,847
Deposits	4,161,950	4,232,492
Short-term borrowed funds	61,854	53,687
Federal Home Loan Bank advances	25,743	25,799
Term repurchase agreement	10,000	10,000
Debt financing	15,000	15,000
Estimate of Fair Value, Fair Value Disclosure [Member]
Cash and due from banks	355,459	491,382
Investment securities held to maturity	1,185,641	1,184,557
Loans	2,014,826	2,090,712
Other assets - FDIC receivable	12,155	13,834
Deposits	4,161,713	4,232,239
Short-term borrowed funds	61,854	53,687
Federal Home Loan Bank advances	26,014	26,150
Term repurchase agreement	10,114	10,135
Debt financing	15,365	15,645
Fair Value, Inputs, Level 1 [Member]
Cash and due from banks	355,459	491,382
Investment securities held to maturity	2,775	3,275
Federal Home Loan Bank advances	26,014	26,150
Fair Value, Inputs, Level 2 [Member]
Investment securities held to maturity	1,182,866	1,181,282
Deposits	3,554,131	3,589,921
Short-term borrowed funds	61,854	53,687
Term repurchase agreement	10,114	10,135
Debt financing	15,365	15,645
Fair Value, Inputs, Level 3 [Member]
Loans	2,014,826	2,090,712
Other assets - FDIC receivable	12,155	13,834
Deposits	$ 607,582	$ 642,318

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investments in debt securities which are categorized as held-to-maturity and that have scheduled maturities more than one year from the balance sheet date or operating cycle, if longer; such investments are normally measured at amortized cost (carrying value) unless circumstances indicate that the value to be recovered from the investment is less than its carried amount. The held-to-maturity category is for those securities that the Company has the positive intent and ability to hold until maturity.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents loan receivable as presented on the statement of financial position which may include mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts, or any other loans which are due the Company as of the balance sheet date.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. The amount of securities that an institution sells and agrees to repurchase (seller-borrower) at a specified date for a specified price, net of any reductions or offsets. Most repurchase agreements involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit (CDs), are sometimes used in repurchase agreements. A repurchase agreement is similar to the seller-borrower's borrowing funds equal to the sales price of the related securities with the securities as collateral. Maturities of such agreements are flexible and generally vary from one day to 270 days.

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