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Note 9 - Borrowed Funds (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Note 9 - Borrowed Funds (Details) [Line Items] |  |  |
Securities Sold under Agreements to Repurchase (in Dollars) | $ 400,000 | $ 400,000 |
Weighted Average Rate of Securities Sold Under Agreements | 3.89% | 3.89% |
Advances from Federal Home Loan Banks (in Dollars) | $ 475,000 | $ 275,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate | 0.46% | 1.13% |
Floating to Fixed Rate Agreements Totaling $200 Million [Member] |  |  |
Note 9 - Borrowed Funds (Details) [Line Items] |  |  |
Number of Securities Sold Under Agreements to Repurchase | 4 |  |
Total Floating to Fixed Rate (in Dollars) | $ 200,000 |  |
Debt, Weighted Average Interest Rate | 5.00% |  |
Floating Interest Rate, Range of Time Period | 1 year |  |
Securities Sold under Agreements to Repurchase [Member] |  |  |
Note 9 - Borrowed Funds (Details) [Line Items] |  |  |
Investment Securities Pledged As Collateral (in Dollars) | $ 429,000 | $ 430,000 |
Mature in March 2018 [Member] |  |  |
Note 9 - Borrowed Funds (Details) [Line Items] |  |  |
Federal Home Loan Bank, Advances, Interest Rate |  |  | 1.13%
Non Callable Fixed Rate Securities [Member] |  |  |
Note 9 - Borrowed Funds (Details) [Line Items] |  |  |
Weighted Average Rate of Securities Sold Under Agreements | 4.00% |  |
Number of Securities Sold Under Agreements to Repurchase | 200,000,000 | 4 |
Debt, Weighted Average Interest Rate | 2.78% | 2.78% |
Mature in August 2016 [Member] | Non Callable Fixed Rate Securities [Member] |  |  |
Note 9 - Borrowed Funds (Details) [Line Items] |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months (in Dollars) | $ 50,000 |  |
Mature in July 2017 [Member] | Non Callable Fixed Rate Securities [Member] |  |  |
Note 9 - Borrowed Funds (Details) [Line Items] |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two (in Dollars) | 50,000 |  |
Mature in June 2018 [Member] | Non Callable Fixed Rate Securities [Member] |  |  |
Note 9 - Borrowed Funds (Details) [Line Items] |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three (in Dollars) | 50,000 |  |
Mature in July 2018 [Member] | Non Callable Fixed Rate Securities [Member] |  |  |
Note 9 - Borrowed Funds (Details) [Line Items] |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four (in Dollars) | 50,000 |  |
Over-night Borrowings [Member] |  |  |
Note 9 - Borrowed Funds (Details) [Line Items] |  |  |
Advances from Federal Home Loan Banks (in Dollars) | $ 100,000 | $ 250,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate | 0.48% | 0.27% |
At Fixed Rate [Member] |  |  |
Note 9 - Borrowed Funds (Details) [Line Items] |  |  |
Advances from Federal Home Loan Banks (in Dollars) | $ 375,000 | $ 25,000 |
Mature in April 2016 [Member] |  |  |
Note 9 - Borrowed Funds (Details) [Line Items] |  |  |
Advances from Federal Home Loan Banks (in Dollars) | 350,000 |  |
Mature in March 2018 [Member] |  |  |
Note 9 - Borrowed Funds (Details) [Line Items] |  |  |
Advances from Federal Home Loan Banks (in Dollars) | $ 25,000 |  |
Maximum [Member] | Floating to Fixed Rate Agreements Totaling $200 Million [Member] |  |  |
Note 9 - 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 9 - 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 9 - Borrowed Funds (Details) [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.89% |  |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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