Note 9 - Borrowed Funds	6 Months Ended
Jun. 30, 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 June 30, 2015, compared to $450.0 million with a weighted average rate of 3.85% at December 31, 2014. In the first six months 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 compared to none in the first six months of 2015. As of June 30, 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 June 30, 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 $448.2 million as of June 30, 2015, and $516.3 million as of December 31, 2014. Borrowing from the FHLB. As of June 30, 2015, over-night borrowings from the FHLB were $60.0 million at a rate of 0.24% compared to $400.0 million at a rate of 0.27% at December 31, 2014. As of June 30, 2015, the advance from the FHLB were $150.0 million at a rate of 0.36% compared to $25.0 million at a rate of 1.13% at December 31, 2014. As of June 30, 2015, FHLB advance of $125.0 million will mature in July 2015 and $25 million will mature in March 2018.

Note 9 - Borrowed Funds

6 Months Ended

Jun. 30, 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 June 30, 2015, compared to $450.0 million with a weighted average rate of 3.85% at December 31, 2014. In the first six months 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 compared to none in the first six months of 2015. As of June 30, 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 June 30, 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 $448.2 million as of June 30, 2015, and $516.3 million as of December 31, 2014.

Borrowing from the FHLB. As of June 30, 2015, over-night borrowings from the FHLB were $60.0 million at a rate of 0.24% compared to $400.0 million at a rate of 0.27% at December 31, 2014. As of June 30, 2015, the advance from the FHLB were $150.0 million at a rate of 0.36% compared to $25.0 million at a rate of 1.13% at December 31, 2014. As of June 30, 2015, FHLB advance of $125.0 million will mature in July 2015 and $25 million will mature in March 2018.