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Note 6 - Debt and Equity Securities (Details) | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Trading Securities | $ 0 | $ 0 |
Held-to-maturity Securities | 6,180,000 | $ 0 |
| 4,510,000 |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities |  |  | $ 1,419,000
REMIC and CMO [Member] |  |  |
Note 6 - 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 | $ 0 | $ 0 |
REMIC and CMO [Member] | FHLMC [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 6 | 7 |
REMIC and CMO [Member] | FNMA [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 12 | 14 |
REMIC and CMO [Member] | GNMA [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 15 | 8 |
Corporate Debt Securities [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 12 | 5 |
Collateralized Debt Obligations [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 7 |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities | $ 0 |  |
Municipal Debt Securities [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Held-to-maturity Securities | $ 6,180,000 |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 3 |
Municipal [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities |  | $ 0 |
Single Issuer Trust Preferred Security [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 1 | 1 |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities | $ 0 | $ 0 |
Pooled Trust Preferred Securities [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 3 |
Proceeds from Sale of Available-for-sale Securities |  | $ 11,100,000 |
Available-for-sale Securities, Gross Realized Losses |  | $ 2,300,000 |
GNMA [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 1 | 1 |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities | $ 0 | $ 0 |
FNMA [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 20 | 13 |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities | $ 0 | $ 0 |
FHLMC [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 3 | 1 |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities | $ 0 | $ 0 |
Collateralized Mortgage Backed Securities [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities | 0 |  |
Commercial Mortgage Backed Securities [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities |  | 0 |
Collateralized Mortgage Obligations [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  |  | 4
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities |  |  | $ 1,400,000
Proceeds from Sale of Available-for-sale Securities |  |  | 18,300,000
Available-for-sale Securities, Gross Realized Losses |  |  | $ 1,700,000
Municipal Bonds [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
| $ 4,500,000 |  |
Municipal Bonds [Member] | REMIC and CMO [Member] | FHLMC [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Held-to-maturity Securities, Maturity Term | 7 months |  |
Non-Qualified Deferred Compensation Plan [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Defined Benefit Plan, Assets for Plan Benefits | $ 10,600,000 | 10,000,000 |
Non-Qualified Deferred Compensation Plan [Member] | Other Assets [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Defined Benefit Plan, Assets for Plan Benefits | $ 14,800,000 | $ 14,000,000 |
Collateralized Mortgage Obligations [Member] | Collateralized by Commercial Real Estate [Member] |  |  |
Note 6 - Debt and Equity Securities (Details) [Line Items] |  |  |
Private Issue Collateralized Mortgage Obligations, Number | 1 | 3 |
Mortgage Backed Securities Available for Sale, Amortized Cost | $ 7,700,000 | $ 12,400,000 |

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