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Note 6 - Debt and Equity Securities (Details) - Securities Available For Sale and Held-to-Maturity by Contractual Maturity - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Note 6 - Debt and Equity Securities (Details) - Securities Available For Sale and Held-to-Maturity by Contractual Maturity [Line Items]    
Due in one year or less $ 6,140,000  
Due in one year or less 6,140,000  
Due after one year through five years 40,000  
Due after one year through five years 40,000  
Total securities held-to-maturity 6,180,000 $ 0
Total securities held-to-maturity 6,180,000  
Due in one year or less 5,976,000  
Due in one year or less 6,011,000  
Due after five years through ten years 76,791,000  
Due after five years through ten years 75,406,000  
Due after ten years 221,344,000  
Due after ten years 221,950,000  
Total other securities 304,111,000  
Total other securities 324,657,000 268,377,000
Amortized Cost 994,311,000 967,329,000
Fair Value 993,397,000 973,310,000
Mutual Fund Debt Securities [Member]    
Note 6 - Debt and Equity Securities (Details) - Securities Available For Sale and Held-to-Maturity by Contractual Maturity [Line Items]    
Amortized Cost 21,290,000 21,118,000
Fair Value 21,290,000 21,118,000
Commercial Mortgage Backed Securities [Member]    
Note 6 - Debt and Equity Securities (Details) - Securities Available For Sale and Held-to-Maturity by Contractual Maturity [Line Items]    
Amortized Cost 668,910,000 702,530,000
Fair Value $ 668,740,000 $ 704,933,000