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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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