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Note 4 - Debt and Equity Securities (Details) - Securities by Contractual Maturity - USD ($)
Sep. 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] 80,000  
Due after one year through five years [1] 80,000  
Total securities held-to-maturity 6,220,000 [1] $ 0
Total securities held-to-maturity [1] 6,220,000  
Securities available for sale:(1)    
Due in one year or less [1] 27,317,000  
Due in one year or less [1] $ 27,371,000  
Due after one year through five years [1]  
Due after one year through five years [1]  
Due after five years through ten years [1] $ 76,934,000  
Due after five years through ten years [1] 76,186,000  
Due after ten years [1] 212,112,000  
Due after ten years [1] 214,944,000  
Total other securities [1] 316,363,000  
Total other securities 318,501,000 [1] 268,377,000
Mortgage-backed securities [1] 681,340,000  
Mortgage-backed securities 690,044,000 [1] 704,933,000
Total securities available for sale 997,703,000 [1] 967,329,000
Total securities available for sale $ 1,008,545,000 [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.