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Note 9 - Allowance for Loan Losses and Credit Quality Information (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Nonperforming Financial Instruments [Member] | Classified [Member]                
Financing Receivable, Modifications, Recorded Investment $ 100,000 $ 100,000 $ 100,000 $ 100,000        
Nonperforming Financial Instruments [Member]                
Impaired Financing Receivable, Related Allowance 800,000   800,000     $ 700,000    
Financing Receivable, Modifications, Recorded Investment 915,000   915,000     901,000    
Performing Financial Instruments [Member] | Classified [Member]                
Financing Receivable, Modifications, Recorded Investment   500,000   500,000        
Performing Financial Instruments [Member]                
Financing Receivable, Modifications, Recorded Investment 1,342,000   1,342,000     1,618,000    
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest 3,450,000   3,450,000     4,181,000    
Impaired Financing Receivable, Related Allowance 950,000   950,000     1,009,000    
Loan Receivable For Which Value Of Collateral Sufficient To Repay 800,000   800,000     1,400,000    
Financing Receivable, Modifications, Recorded Investment 2,257,000   2,257,000     2,519,000    
Loans and Leases Receivable, Impaired, Commitment to Lend $ 900,000   $ 900,000     1,500,000    
Loan to Value Ration 75.00%   75.00%          
Allowance for Credit Losses, Change in Method of Calculating Impairment $ 500,000   $ 500,000     $ 500,000    
Percentage Reserves For Loan Losses On Troubled Debt Restructurings 4.50%   4.50%     5.20%    
Loans and Leases Receivable, Allowance $ 10,325,000 $ 8,402,000 $ 10,325,000 $ 8,402,000 $ 9,363,000 $ 9,709,000 $ 8,418,000 $ 8,332,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net $ 600,000   $ 600,000          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 2 0 2 0        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses     $ 0