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Note 3 - Loans and Allowance for Loan Losses (Details Textual)
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Number of Foreclosed Real Estate Properties 0 0 0
Mortgage Loans in Process of Foreclosure, Amount $ 258,000   $ 109,000
Loans and Leases Receivable, Net of Deferred Income, Total 520,885,000   525,818,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total 174,000   317,000
Allowance for Loan and Lease Losses, Period Increase (Decrease), Total 6,600,000   6,600,000
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total 0 $ 0  
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 0   0
Financing Receivable, Modifications, Number of Contracts 0    
Financing Receivable, Troubled Debt Restructuring, Premodification and Postmodification   $ 265,000  
Troubled Debt Restructuring, Principal Charge-offs $ 0    
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 1 0  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default $ 290,000    
Provision for Loan and Lease Losses, Total 75,000 $ 351,000  
Financing Receivable, Deferred Payments 68,100,000    
Financing Receivable, Deferred Payments, Resumed 61,700,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance, Total 381,000   390,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses 32,000   31,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses 1,000 11,000  
Nonaccrual [Member]      
Provision for Loan and Lease Losses, Total 9,000    
Overall Qualitative Factor [Member]      
Allowance for Loan and Lease Losses, Period Increase (Decrease), Total 6,100,000   6,000,000.0
Commercial Portfolio Segment [Member]      
Loans and Leases Receivable, Net of Deferred Income, Total 71,916,000   82,274,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total (991,000)   (843,000)
Provision for Loan and Lease Losses, Total (27,000) $ 25,000  
Commercial Real Estate Portfolio Segment [Member]      
Financing Receivable, Modifications, Number of Contracts   1  
Residential Mortgage Segment [Member]      
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 27,900,000   37,300,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total $ 990,000   $ 843,000