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Note 7 -Investment Securities (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
security
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
security
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Investment Securities [Line Items]          
Net (loss) gain on trading activities $ (39,000) $ 36,000 $ 47,000 $ 17,000  
Trading Securities, Change in Unrealized Holding Gain (Loss)     13,000   $ 31,000
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds 3,078,000 685,000 31,892,000 27,480,000  
Income Tax Expense Benefit Related to Net Realized Gains Losses on Sales of Securities 107,000 $ 29,000 221,000 273,000  
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses     0 0  
Available-for-sale, amortized cost 365,367,000   365,367,000   362,742,000
Fair value $ 368,834,000   $ 368,834,000   361,915,000
Fair Value Inputs, Prepayment Rate     1.00%    
Threshold For Identifying Banks With Trust Preferred Securities     $ 15,000,000,000    
Minimum Cost Saving for Refinance 2.00%   2.00%    
Bank Failure Rate     0.37%    
Fair Value Inputs, Loss Severity     95.00%    
U.S. Government Agency and Sponsored Enterprises Securities [Member]          
Investment Securities [Line Items]          
Available-for-sale Securities Pledged as Collateral $ 215,013,000   $ 215,013,000   197,149,000
Collateralized Debt Obligations [Member]          
Investment Securities [Line Items]          
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses     $ 0 $ 0  
Number Of Trust Preferred Securities | security 6   6    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security 5   5    
Available-for-sale, amortized cost $ 2,979,000   $ 2,979,000   3,291,000
Fair value $ 2,275,000   $ 2,275,000   $ 2,653,000
Collateralized Debt Obligations [Member] | Minimum [Member]          
Investment Securities [Line Items]          
Fair Value Inputs, Probability of Default     0.25%    
Fair Value Inputs, Loss Severity     0.00%    
Collateralized Debt Obligations [Member] | Maximum [Member]          
Investment Securities [Line Items]          
Fair Value Inputs, Probability of Default     0.51%    
Fair Value Inputs, Loss Severity     100.00%