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Note 9 - Borrowed Funds (Details Textual) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 23, 2014 | Mar. 13, 2014 USD ($) | Nov. 23, 2004 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Securities Sold under Agreements to Repurchase |  |  |  | $ 350,000,000 | $ 400,000,000 |
Weighted Average Rate Of Securities Sold Under Agreements |  |  |  | 4.06% | 3.89% |
Debt, Weighted Average Interest Rate |  |  |  | 4.01% | 3.95% | 3.92%
Debt Instrument, Basis Spread on Variable Rate | 2.75% | 3.50% |  |  |  |
Advances from Federal Home Loan Banks |  |  |  | $ 350,000,000 | $ 275,000,000 |
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% |  |  |
Interest Expense, Other |  |  |  | 83,000 | 79,000 | $ 93,000
Accrued Bonuses |  |  |  | 1,700,000 | 1,600,000 |
Over-night Borrowings [Member] |  |  |  |  |  |
Advances from Federal Home Loan Banks |  |  |  | $ 275,000,000 | $ 250,000,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  |  |  | 0.55% | 0.27% |
Non Overnight Borrowings [Member] |  |  |  |  |  |
Advances from Federal Home Loan Banks |  |  |  | $ 75,000,000 | $ 25,000,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  |  |  | 1.48% | 1.13% |
Securities Sold under Agreements to Repurchase [Member] |  |  |  |  |  |
Investment Securities Pledged As Collateral |  |  |  | $ 372,000,000 | $ 430,200,000 |
Non Callable Fixed Rate Securities [Member] |  |  |  |  |  |
Securities Sold under Agreements to Repurchase |  |  |  | $ 150,000,000 | $ 200,000,000 |
Weighted Average Rate Of Securities Sold Under Agreements |  |  |  | 2.81% | 2.78% |
Number Of Securities Sold Under Agreements To Repurchase |  |  |  | 3 | 4 |
Non Callable Fixed Rate Securities [Member] | Mature in August 2016 [Member] |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months |  |  |  | $ 50,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  |  | 50,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  |  | $ 50,000,000 |  |
Floating to Fixed Rate Agreements Totaling 200 Million [Member] |  |  |  |  |  |
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 |  |
Floating to Fixed Rate Agreements Totaling 200 Million [Member] | Maximum [Member] |  |  |  |  |  |
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] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 3.40% |  |
Floating to Fixed Rate Agreements Totaling 200 Million [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.89% |  |
Mature in March 2018 [Member] |  |  |  |  |  |
Advances from Federal Home Loan Banks |  |  |  | $ 25,000,000 |  |
Mature in December 2019 [Member] |  |  |  |  |  |
Advances from Federal Home Loan Banks |  |  |  |  | $ 50,000,000 |
Treasury Note [Member] |  |  |  |  |  |
Debt Instrument, Term | 10 years | 5 years |  |  |  |

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