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Note 5 - Investment Securities (Details)
1 Months Ended 3 Months Ended
Jul. 31, 2014
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Note 5 - Investment Securities (Details) [Line Items]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses (in Dollars)   $ 1,000 $ 3,000  
Securities, Continuous Loss Position, Accumulated Loss (in Dollars)   4,000,000   $ 6,300,000
Securities, Continuous Unrealized Loss Position, Fair Value (in Dollars)   121,100,000   $ 262,700,000
Proceeds from Sale of Available-for-sale Securities (in Dollars)   54,715,000    
Available-for-sale Securities, Gross Realized Gains (in Dollars)   320,000    
Available-for-sale Securities, Gross Realized Losses (in Dollars)   24,000    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax (in Dollars)   $ 106,000    
Number of Securities Sold     0  
Mortgage-backed Securities, Issued by Private Enterprises [Member]        
Note 5 - Investment Securities (Details) [Line Items]        
Number of Securities in Investment Portfolio   0   0
Collateralized Mortgage Obligations [Member]        
Note 5 - Investment Securities (Details) [Line Items]        
Number of Securities in Investment Portfolio   0   0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   11    
Number of Securities Transferred to Held-to-maturity 13      
Held-to-maturity Securities Transferred from Available-for-sale (in Dollars) $ 70,100,000      
Securities Transferred to Held-to-maturity Unrealized Gain (Loss) (in Dollars) $ (1,200,000) $ (885,000)    
US Government Agencies Debt Securities [Member]        
Note 5 - Investment Securities (Details) [Line Items]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   2    
Collateralized Mortgage Backed Securities [Member]        
Note 5 - Investment Securities (Details) [Line Items]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   3    
US States and Political Subdivisions Debt Securities [Member]        
Note 5 - Investment Securities (Details) [Line Items]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   3    
Asset-backed Securities [Member]        
Note 5 - Investment Securities (Details) [Line Items]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   2    
Corporate Debt Securities [Member]        
Note 5 - Investment Securities (Details) [Line Items]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   8    
Alt-A [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]        
Note 5 - Investment Securities (Details) [Line Items]        
Number of Securities in Investment Portfolio   0   0
Alt-A [Member] | Collateralized Mortgage Obligations [Member]        
Note 5 - Investment Securities (Details) [Line Items]        
Number of Securities in Investment Portfolio   0   0
Subprime [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]        
Note 5 - Investment Securities (Details) [Line Items]        
Number of Securities in Investment Portfolio   0   0
Subprime [Member] | Collateralized Mortgage Obligations [Member]        
Note 5 - Investment Securities (Details) [Line Items]        
Number of Securities in Investment Portfolio   0   0