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Note 4 - Debt and Equity Securities (Details) - Securities by Contractual Maturity - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Securities held-to-maturity:(1)    
Due in one year or less [1] $ 6,140,000  
Due in one year or less [1] 6,140,000  
Due after one year through five years [1] 1,080,000  
Due after one year through five years [1] 1,080,000  
Total securities held-to-maturity 7,220,000 [1] $ 0
Total securities held-to-maturity [1] 7,220,000  
Securities available for sale:(1)    
Due in one year or less [1] 32,046,000  
Due in one year or less [1] 32,232,000  
Due after one year through five years [1] 15,000,000  
Due after one year through five years [1] 15,298,000  
Due after five years through ten years [1] 92,077,000  
Due after five years through ten years [1] 90,741,000  
Due after ten years [1] 166,853,000  
Due after ten years [1] 169,552,000  
Total other securities [1] 305,976,000  
Total other securities 307,823,000 [1] 268,377,000
Mortgage-backed securities [1] 727,583,000  
Mortgage-backed securities 729,674,000 [1] 704,933,000
Total securities available for sale 1,033,559,000 [1] 967,329,000
Total securities available for sale $ 1,037,497,000 [1] $ 973,310,000
[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.