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Note 4 - Loans Receivable and Related Allowance for Loan Losses (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Loans and Leases Receivable, Deferred Income, Total $ 1,800,000     $ 2,500,000  
Loans and Leases Receivable, Net of Deferred Income, Total 795,188,000     809,918,000  
Loans and Leases Receivable, Allowance, Ending Balance 9,685,000 $ 7,220,000   9,580,000 $ 6,556,000
Financing Receivable, Troubled Debt Restructuring 384,000     396,000  
Allowance for Losses Allocated to Loans Classified as TDRS $ 3,000     $ 6,000  
Financing Receivable, Modifications, Number of Contracts 0 0      
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 0 0      
Financing Receivable, Number of Payment Deferrals 29     419  
Financing Receivable, Principal and Interest Deferred Payments $ 33,900,000     $ 111,600,000  
Financing Receivable, Percent of Outstanding Loan Balance Deferred 4.40%     14.70%  
Hotel Loans [Member]          
Financing Receivable, Principal and Interest Deferred Payments $ 30,100,000        
Financing Receivable, Percent of Outstanding Loan Balance Deferred 88.80%        
United American Savings Bank [Member]          
Loans and Leases Receivable, Allowance, Ending Balance $ 0        
Other Loans [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total 128,041,000     $ 129,174,000  
Commercial Portfolio Segment [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total 84,953,000     89,139,000  
Loans and Leases Receivable, Allowance, Ending Balance 612,000 $ 681,000   677,000 $ 636,000
Commercial Portfolio Segment [Member] | Other Loans [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total 84,953,000     89,139,000  
Commercial Portfolio Segment [Member] | SBA CARES Act Paycheck Protection Program [Member] | Other Loans [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total 32,600,000     30,400,000  
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total 3,300,000        
Amortization of Deferred Loan Origination Fees, Net $ 641,000     $ 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     $ 1,400,000