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Note 10 - Borrowed Funds (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 23, 2014 | Mar. 13, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2005 | Dec. 31, 2004
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 |  |  | $ 0 | $ 100,000,000 |  |  |
Rate of Prepaid Security Sold Under Repurchase Agreements |  |  |  | 3.50% |  |  |
Prepayment Penalty Security Sold Under Agreements to Repurchase |  |  |  | $ 3,400,000 |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 3.50% |  |  |  |  |
Advances from Federal Home Loan Banks |  |  | $ 275,000,000 | $ 425,000,000 |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Weighted Average Interest Rate |  |  | 0.27% | 0.27% |  |  |
Threshold for Deferred Bonus |  |  |  |  |  | $ 225,000 |
Amount of Deferred Bonus Accrued in Other Liabilities |  | $ 300,000 |  |  |  |  | $ 610,000
Accrued Interest On Deferred Bonus | 5.06% | 5.02% |  |  |  |  | 7.00%
Debt Instrument Basis Spread on Variable Rate 2 | 2.75% |  |  |  |  |  |
Interest Expense, Other |  |  | $ 79,000 | $ 93,000 | $ 77,000 |  |
Accrued Bonuses |  |  | 1,600,000 | 1,500,000 |  |  |
Mature in March 2018 [Member] |  |  |  |  |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |  |  |  |  |
Advances from Federal Home Loan Banks |  |  | $ 25,000,000 | $ 25,000,000 |  |  |
Federal Home Loan Bank, Advances, Interest Rate |  |  | 1.13% | 1.13% |  |  |
Non Callable Fixed Rate Securities [Member] |  |  |  |  |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |  |  |  |  |
Number of Securities Sold Under Agreements to Repurchase |  |  | 4 | 4 |  |  |
Total Floating to Fixed Rate |  |  | $ 200,000,000 | $ 200,000,000 |  |  |
Debt, Weighted Average Interest Rate |  |  | 2.78% | 2.78% |  |  |
Floating to Fixed Rate Agreements Totaling $200 Million [Member] |  |  |  |  |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |  |  |  |  |
Number of Securities Sold Under Agreements to Repurchase |  |  | 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 |  |  |  |
Securities Sold under Agreements to Repurchase [Member] |  |  |  |  |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  | 3.95% | 3.92% | 3.88% |  |
Investment Securities Pledged As Collateral |  |  | $ 430,200,000 | $ 516,300,000 |  |  |
Mature in August 2016 [Member] | Non Callable Fixed Rate Securities [Member] |  |  |  |  |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months |  |  | 50,000,000 |  |  |  |
Mature in July 2017 [Member] | Non Callable Fixed Rate Securities [Member] |  |  |  |  |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  | 50,000,000 |  |  |  |
Mature in June 2018 [Member] | Non Callable Fixed Rate Securities [Member] |  |  |  |  |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  | 50,000,000 |  |  |  |
Mature in July 2018 [Member] | Non Callable Fixed Rate Securities [Member] |  |  |  |  |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  | $ 50,000,000 |  |  |  |
Maximum [Member] | Floating to Fixed Rate Agreements Totaling $200 Million [Member] |  |  |  |  |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.07% |  |  |  |
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Floating to Fixed Rate Agreements Totaling $200 Million [Member] |  |  |  |  |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 3.40% |  |  |  |
Minimum [Member] | Floating to Fixed Rate Agreements Totaling $200 Million [Member] |  |  |  |  |  |  |
Note 10 - Borrowed Funds (Details) [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.89% |  |  |  |

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