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Note 10 - Borrowed Funds (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |
Securities Sold under Agreements to Repurchase | $ 400,000,000 | $ 450,000,000 |
Weighted Average Rate of Securities Sold Under Agreements | 3.89% | 3.85% |
Prepaid Security Sold Under Repurchase Agreement |  |  | $ 100,000,000
Rate of Prepaid Security Sold Under Repurchase Agreements |  |  | 3.50%
Prepayment Penalty Security Sold Under Agreements to Repurchase | $ 0 |  | $ 3,400,000
Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Twelve Months | 0 | $ 400,000,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  | 0.27% |
Long-term Federal Home Loan Bank Advances | $ 75,000,000 | $ 25,000,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Weighted Average Interest Rate | 0.87% | 1.13% |
Mature in July 2015 [Member] |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |
Long-term Federal Home Loan Bank Advances | $ 50,000,000 |  |
Mature in March 2018 [Member] |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |
Long-term Federal Home Loan Bank Advances | 25,000,000 |  |
Callable Securities [Member] |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |
Securities Sold under Agreements to Repurchase | $ 200,000,000 |  |
Weighted Average Rate of Securities Sold Under Agreements |  | 2.78% |
Number of Floating-to-fixed Rate Agreements | 4 | 4 |
Non Callable Fixed Rate Securities [Member] |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |
Securities Sold under Agreements to Repurchase |  | $ 200,000,000 |
Weighted Average Rate of Securities Sold Under Agreements | 2.78% |  |
Mature in August 2016 [Member] |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | $ 50,000,000 |  |
Mature in July 2017 [Member] |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 50,000,000 |  |
Mature in June 2018 [Member] |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 50,000,000 |  |
Mature in July 2018 [Member] |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | $ 50,000,000 |  |
Floating to Fixed Rate Agreements Totaling $200 Million [Member] |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |
Number of Floating-to-fixed Rate Agreements | 4 |  |
Total Floating to Fixed Rate | $ 200,000,000 |  |
Debt, Weighted Average Interest Rate | 5.00% |  |
Floating Interest Rate, Range of Time Period | 1 year |  |
Floating to Fixed Rate Agreements Totaling $200 Million [Member] | Maximum [Member] |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.07% |  |
Floating to Fixed Rate Agreements Totaling $200 Million [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 3.40% |  |
Floating to Fixed Rate Agreements Totaling $200 Million [Member] | Minimum [Member] |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.89% |  |
Securities Sold under Agreements to Repurchase [Member] |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |
Investment Securities Pledged As Collateral | $ 439,800,000 | $ 516,300,000 |

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