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Note 4 - Debt and Equity Securities (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2014 USD ($)
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |  |  |  |
Trading Securities (in Dollars) |  |  | $ 0 |  | $ 0
Held-to-maturity Securities (in Dollars) |  |  | 6,220,000 | [1] | $ 0
Transfer from Available for Sale Security to Held to Maturity (in Dollars) |  |  | 4,510,000 |  |
Mortgage Backed Securities Available For Sale, Amortized Cost (in Dollars) | [1] |  | $ 681,340,000 |  |
Corporate Debt Securities [Member] |  |  |  |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  |  | 11 |  |
Municipals Debt Securities [Member] |  |  |  |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |  |  |  |
Held-to-maturity Securities (in Dollars) |  |  | $ 6,220,000 |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  |  | 2 |  |
Single Issuer Trust Preferred Security [Member] |  |  |  |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  |  | 1 |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) |  |  | $ 0 |  |
REMIC And CMO [Member] | FHLMC [Member] |  |  |  |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  |  | 1 |  |
REMIC And CMO [Member] | FNMA [Member] |  |  |  |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  |  | 8 |  |
REMIC And CMO [Member] | GNMA [Member] |  |  |  |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  |  | 4 |  |
REMIC And CMO [Member] | Private Issues [Member] |  |  |  |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  |  | 9 |  |
GNMA [Member] |  |  |  |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  |  | 1 |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) |  |  | $ 0 |  |
Municipal Bonds [Member] |  |  |  |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |  |  |  |
Transfer from Available for Sale Security to Held to Maturity (in Dollars) |  | $ 4,500,000 |  |  |
Collateralized Loan Obligations [Member] |  |  |  |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  |  | 5 |  |
Collateralized Mortgage Obligations [Member] | Collateralized By Commercial Real Estate [Member] |  |  |  |  |
Note 4 - Debt and Equity Securities (Details) [Line Items] |  |  |  |  |
Private Issue Collateralized Mortgage Obligations, Number |  |  | 2 |  | 3
Mortgage Backed Securities Available For Sale, Amortized Cost (in Dollars) |  |  | $ 9,000,000 |  | $ 12,400,000
[1] | Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

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