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Note 3 - Loans and Allowance for Loan Losses (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Number of Foreclosed Real Estate Properties         0
Mortgage Loans in Process of Foreclosure, Amount $ 213,000   $ 213,000   $ 109,000
Loans and Leases Receivable, Net of Deferred Income, Total 520,979,000   520,979,000   525,818,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total 121,000   121,000   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 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   321,000   586,000  
Troubled Debt Restructuring, Principal Charge-offs $ 0 0 $ 0 0  
Troubled Debt Restructuring, Specific Allowance $ 0 $ 0 $ 0 $ 0  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 0 0 1 0  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default     $ 290,000    
Provision for Loan and Lease Losses, Total $ 0 $ 825,000 75,000 $ 1,176,000  
Financing Receivable, Deferred Payments 68,100,000   68,100,000    
Financing Receivable, Deferred Payments, Resumed 58,500,000   58,500,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance, Total 369,000   369,000   390,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses 30,000   30,000   31,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses 2,000 $ 0 1,000 $ 11,000  
Nonaccrual [Member]          
Provision for Loan and Lease Losses, Total     7,000    
Overall Qualitative Factor [Member]          
Allowance for Loan and Lease Losses, Period Increase (Decrease), Total     6,100,000   6,000,000.0
Residential Portfolio Segment [Member]          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Foreclosure     110,000    
Commercial Portfolio Segment [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total 68,208,000   68,208,000   82,274,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total (1,053,000)   (1,053,000)   (843,000)
Financing Receivable, Modifications, Number of Contracts   1   1  
Provision for Loan and Lease Losses, Total (32,000) $ 248,000 (59,000) $ 273,000  
Commercial Portfolio Segment [Member] | SBA CARES Act Paycheck Protection Program [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total 23,400,000   23,400,000   37,300,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total 1,100,000   1,100,000   843,000
Residential Mortgage 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 49,817,000   49,817,000   52,001,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total 1,117,000   1,117,000   $ 1,100,000
Financing Receivable, Modifications, Number of Contracts   1   1  
Provision for Loan and Lease Losses, Total $ 3,000 $ 45,000 $ 17,000 $ 79,000  
Commercial Real Estate Portfolio Segment [Member]          
Financing Receivable, Modifications, Number of Contracts       1