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Note 3 - Loans and Allowance for Loan Losses (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Loans Charge-off Period (Day)     90 days    
Performance Period (Month)     6 months    
Collateral Dependent Loans, Value of Significant Properties $ 200,000   $ 200,000    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Foreclosure     57,000   $ 170,000
Mortgage Loans in Process of Foreclosure, Amount 162,000   162,000   319,000
Loans and Leases Receivable, Net of Deferred Income, Total 519,602,000   519,602,000   493,499,000
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total 0 $ 0 0 $ 0  
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 0   0   0
Financing Receivable, Modifications, Number of Contracts 0 0      
Financing Receivable, Troubled Debt Restructuring, Premodification and Postmodification     586,000 436,000  
Troubled Debt Restructuring, Principal Charge-offs $ 0 $ 0 $ 0 $ 0  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 0 0 0 0  
Financing Receivable, Deferred Payments $ 68,100,000   $ 68,100,000    
Financing Receivable, Deferred Payments, Resumed 58,100,000   58,100,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance, Total 425,000   425,000   466,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses 24,000   24,000   12,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses 1,000 $ 20,000 12,000 $ 20,000  
Troubled Debt Restructuring, Specific Allowance 0 $ 0 0 $ 0  
Classified Loans [Member]          
Allowance for Loan and Lease Losses, Period Increase (Decrease), Total     459,000   386,000
Overall Qualitative Factor [Member]          
Allowance for Loan and Lease Losses, Period Increase (Decrease), Total     5,400,000   3,800,000
Commercial Portfolio Segment [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total 79,856,000   $ 79,856,000   45,307,000
Financing Receivable, Modifications, Number of Contracts     1    
Residential Portfolio Segment [Member]          
Financing Receivable, Modifications, Number of Contracts     2    
Commercial Real Estate Portfolio Segment [Member]          
Financing Receivable, Modifications, Number of Contracts     1 2  
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total 51,885,000   $ 51,885,000   $ 54,677,000
Financing Receivable, Modifications, Number of Contracts     1    
SBA CARES Act Paycheck Protection Program [Member] | Commercial Portfolio Segment [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total $ 45,900,000   $ 45,900,000    
Bank Overdrafts [Member]          
Loans Charge-off Period (Day)     45 days