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Note 3 - Loans Receivable and Related Allowance for Loan Losses (Details Textual)
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Feb. 28, 2021
USD ($)
Dec. 31, 2018
USD ($)
Loans and Leases Receivable, Deferred Income, Total   $ 2,500,000 $ 2,600,000    
Loans and Leases Receivable, Net of Deferred Income, Total   809,918,000 701,904,000    
Loans and Leases Receivable, Allowance, Ending Balance   9,580,000 6,556,000   $ 6,508,000
Financing Receivable, Troubled Debt Restructuring   396,000 409,000    
Allowance for Losses Allocated to Loans Classified as TDRS   $ 6,000 $ 5,000    
Financing Receivable, Modifications, Number of Contracts     0    
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts   0 0    
Financing Receivable, Number of Payment Deferrals   410      
Financing Receivable, Principal and Interest Deferred Payments   $ 110,400,000      
Financing Receivable, Percent of Outstanding Loan Balance Deferred   13.60%      
Subsequent Event [Member]          
Financing Receivable, Number of Payment Deferrals       28  
Financing Receivable, Principal and Interest Deferred Payments       $ 35,400,000  
Financing Receivable, Number of Deferred Payment Loans Resumed or Paid Off       382  
Financing Receivable, Deferred Payment Loans Resumed or Paid Off       $ 75,000,000  
Subsequent Event [Member] | Hotel Loans [Member]          
Financing Receivable, Principal and Interest Deferred Payments       $ 32,800,000  
Financing Receivable, Percent of Outstanding Loan Balance Deferred       92.70%  
United American Savings Bank [Member]          
Loans and Leases Receivable, Allowance, Ending Balance   $ 0 $ 0    
Northern Hancock Bank & Trust Co. [Member]          
Loans and Leases Receivable, Allowance, Ending Balance   0 0    
Community First [Member]          
Loans and Leases Receivable, Allowance, Ending Balance   0 0    
Other Loans [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total   129,174,000 81,242,000    
Commercial Portfolio Segment [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total   89,139,000 66,603,000    
Loans and Leases Receivable, Allowance, Ending Balance   677,000 636,000   500,000
Commercial Portfolio Segment [Member] | Extended Maturity [Member]          
Financing Receivable, Troubled Debt Restructuring   64,000      
Allowance for Losses Allocated to Loans Classified as TDRS   $ 6,000      
Financing Receivable, Modifications, Number of Contracts   1      
Commercial Portfolio Segment [Member] | Other Loans [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total   $ 89,139,000 66,603,000    
Commercial Portfolio Segment [Member] | SBA CARES Act Paycheck Protection Program [Member] | Other Loans [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total   30,400,000      
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total   2,100,000      
Amortization of Deferred Loan Origination Fees, Net   1,300,000      
Commercial Portfolio Segment [Member] | SBA CARES Act Paycheck Protection Program [Member] | Other Loans [Member] | Forecast [Member]          
Amortization of Deferred Loan Origination Fees, Net $ 795,000        
Commercial Real Estate Portfolio Segment [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total   285,625,000 229,951,000    
Loans and Leases Receivable, Allowance, Ending Balance   $ 5,180,000 2,898,000   $ 3,106,000
Commercial Real Estate Portfolio Segment [Member] | Previously Reported [Member]          
Financing Receivable, Troubled Debt Restructuring     $ 67,000    
Financing Receivable, Modifications, Number of Contracts     1