Note 9 - Borrowed Funds	3 Months Ended
Mar. 31, 2015
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	9. Borrowed Funds Securities Sold Under Agreements to Repurchase. Securities sold under agreements to repurchase were $400.0 million with a weighted average rate of 3.89% at March 31, 2015, compared to $450.0 million with a weighted average rate of 3.85% at December 31, 2014. In the first quarter of 2014, the Company prepaid securities sold under agreements to repurchase totaling $100.0 million with a weighted average rate of 3.50% and incurred prepayment penalties of $3.4 million. As of March 31, 2015, four floating-to-fixed rate agreements totaling $200.0 million with weighted average rate of 5.0% and final maturity in January 2017 have initial floating rates for one year, with floating rates of three-month LIBOR rate minus 340 basis points. Thereafter, the rates are fixed for the remainder of the term, with interest rates ranging from 4.89% to 5.07%. As of March, 31, 2015, and December 31, 2014, four fixed rate non-callable securities sold under agreements to repurchase totaled $200.0 million with a weighted average rate of $2.78%. Final maturity for the four fixed rate non-callable securities sold under agreements is $50.0 million in August 2016, $50.0 million in July 2017, $50.0 million in June 2018, and $50.0 million in July 2018. These transactions are accounted for as collateralized financing transactions and recorded at the amounts at which the securities were sold. The Company may have to provide additional collateral for the repurchase agreements, as necessary. The underlying collateral pledged for the repurchase agreements consists of U.S. Treasury securities and mortgage-backed securities with a fair value of $467.5 million as of March 31, 2015, and $516.3 million as of December 31, 2014. Borrowing from the FHLB. As of March 31, 2015, over-night borrowings from the FHLB were $460.0 million at a rate of 0.24% compared to $400.0 million at a rate of 0.27% at December 31, 2014. As of March 31, 2015, and December 31, 2014, the long-term advance from the FHLB of $25.0 million was at a rate of 1.13% and will mature in March 2018.

Note 9 - Borrowed Funds

3 Months Ended

Mar. 31, 2015

9. Borrowed Funds

Securities Sold Under Agreements to Repurchase. Securities sold under agreements to repurchase were $400.0 million with a weighted average rate of 3.89% at March 31, 2015, compared to $450.0 million with a weighted average rate of 3.85% at December 31, 2014. In the first quarter of 2014, the Company prepaid securities sold under agreements to repurchase totaling $100.0 million with a weighted average rate of 3.50% and incurred prepayment penalties of $3.4 million. As of March 31, 2015, four floating-to-fixed rate agreements totaling $200.0 million with weighted average rate of 5.0% and final maturity in January 2017 have initial floating rates for one year, with floating rates of three-month LIBOR rate minus 340 basis points. Thereafter, the rates are fixed for the remainder of the term, with interest rates ranging from 4.89% to 5.07%. As of March, 31, 2015, and December 31, 2014, four fixed rate non-callable securities sold under agreements to repurchase totaled $200.0 million with a weighted average rate of $2.78%. Final maturity for the four fixed rate non-callable securities sold under agreements is $50.0 million in August 2016, $50.0 million in July 2017, $50.0 million in June 2018, and $50.0 million in July 2018.

These transactions are accounted for as collateralized financing transactions and recorded at the amounts at which the securities were sold. The Company may have to provide additional collateral for the repurchase agreements, as necessary. The underlying collateral pledged for the repurchase agreements consists of U.S. Treasury securities and mortgage-backed securities with a fair value of $467.5 million as of March 31, 2015, and $516.3 million as of December 31, 2014.

Borrowing from the FHLB. As of March 31, 2015, over-night borrowings from the FHLB were $460.0 million at a rate of 0.24% compared to $400.0 million at a rate of 0.27% at December 31, 2014. As of March 31, 2015, and December 31, 2014, the long-term advance from the FHLB of $25.0 million was at a rate of 1.13% and will mature in March 2018.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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