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Note 5 - Loans and Allowance for Loan Losses (Details Textual)
xbrli-pure in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
Jun. 30, 2018
USD ($)
Jun. 30, 2017
Dec. 31, 2017
USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net $ 5,965,000   $ 5,965,000    
Certain Loans and Debt Securities Acquired in Transfer, No Allowance Recorded and No Subsequent Impairment $ 6,000,000   $ 6,000,000    
Financing Receivable, Modifications, Number of Contracts 0        
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0 0 0 0  
Substandard [Member]          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net $ 6,000,000   $ 6,000,000    
Nonaccruing Loans [Member]          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 1,800,000   1,800,000    
Troubled Debt Restructuring [Member]          
Allowance for Credit Losses, Change in Method of Calculating Impairment 939,567   939,567   $ 372,321
Financing Receivables, 30 to 59 Days Past Due [Member]          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 290,618   290,618    
Financing Receivables, 60 to 89 Days Past Due [Member]          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 334,175   334,175    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net $ 462,036   $ 462,036