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Note 4 - Debt and Equity Securities (Details)		3 Months Ended		6 Months Ended
		Jun. 30, 2015 USD ($)		Jun. 30, 2015 USD ($)		Dec. 31, 2014 USD ($)
Note 4 - Debt and Equity Securities (Details) [Line Items]
Trading Securities (in Dollars)		$ 0		$ 0		$ 0
Held-to-maturity Securities (in Dollars)		7,220,000	[1]	7,220,000	[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]	$ 727,583,000		$ 727,583,000
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		7		7
Municipals Debt Securities [Member]
Note 4 - Debt and Equity Securities (Details) [Line Items]
Held-to-maturity Securities (in Dollars)		$ 7,220,000		$ 7,220,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		5		5
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		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		12		12
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		14		14
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		9		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		1
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars)				$ 0
FNMA [Member]
Note 4 - Debt and Equity Securities (Details) [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		17		17
Collateralized By Commercial Real Estate [Member] | Collateralized Mortgage Obligations [Member]
Note 4 - Debt and Equity Securities (Details) [Line Items]
Private Issue Collateralized Mortgage Obligations, Number		2		2		3
Mortgage Backed Securities Available For Sale, Amortized Cost (in Dollars)		$ 9,100,000		$ 9,100,000		$ 12,400,000
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
[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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