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Note 4 - Loan Receivables and Allowance for Loan and Lease Losses - Impaired Loans (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Impaired loans, related allowance | $ 1,400,000 | $ 1,500,000 |
Impaired loans, recorded investment | 24,400,000 | 19,600,000 |
With no allowance recorded, average recorded investment | 12,783,000 | 19,123,000 | $ 9,563,000
With no allowance recorded, interest income recognized | 193,000 | 279,000 | 645,000
With allowance recorded, average recorded investment | 8,934,000 | 3,572,000 | 609,000
With allowance recorded, interest income recognized | 42,000 | 415,000 |
Impaired Loans, Average recorded investment | 21,717,000 | 22,695,000 | 10,172,000
Impaired Loans, interest income recognized | 235,000 | 694,000 | 645,000
Business Activities Loans [Member] |  |  |
Impaired loans with no related allowance recorded, recorded investment | 15,453,000 | 10,828,000 |
Impaired loans with no related allowance recorded, unpaid principal balance | 16,692,000 | 10,992,000 |
Impaired loans with a related allowance recorded, recorded investment | 8,930,000 | 8,800,000 |
Impaired loans with a related allowance recorded, unpaid principal balance | 8,930,000 | 8,800,000 |
Impaired loans, related allowance | 1,412,000 | 1,496,000 |
Impaired loans, recorded investment | 24,383,000 | 19,628,000 |
Impaired loans, unpaid principal balance | 25,622,000 | 19,792,000 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
With no allowance recorded, average recorded investment | 5,859,000 | 9,829,000 | 3,318,000
With no allowance recorded, interest income recognized | 39,000 | 95,000 | 100,000
With allowance recorded, average recorded investment | 8,861,000 | 888,000 |
With allowance recorded, interest income recognized | 35,000 | 415,000 |
Impaired Loans, Average recorded investment | 14,720,000 | 10,717,000 | 3,318,000
Impaired Loans, interest income recognized | 74,000 | 510,000 | 100,000
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |
Impaired loans with no related allowance recorded, recorded investment | 5,723,000 | 4,234,000 |
Impaired loans with no related allowance recorded, unpaid principal balance | 6,644,000 | 4,309,000 |
Impaired loans with a related allowance recorded, recorded investment | 8,811,000 | 8,800,000 |
Impaired loans with a related allowance recorded, unpaid principal balance | 8,811,000 | 8,800,000 |
Impaired loans, related allowance | 1,398,000 | 1,496,000 |
Impaired loans, recorded investment | 14,534,000 | 13,034,000 |
Impaired loans, unpaid principal balance | 15,455,000 | 13,109,000 |
Residential Portfolio Segment [Member] |  |  |
With no allowance recorded, average recorded investment | 3,681,000 | 2,531,000 | 3,154,000
With no allowance recorded, interest income recognized | 28,000 | 104,000 | 11,000
With allowance recorded, average recorded investment | 34,000 | 952,000 | 126,000
With allowance recorded, interest income recognized | 7,000 |  |
Impaired Loans, Average recorded investment | 3,715,000 | 3,483,000 | 3,280,000
Impaired Loans, interest income recognized | 35,000 | 104,000 | 11,000
Residential Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |
Impaired loans with no related allowance recorded, recorded investment | 3,853,000 | 3,621,000 |
Impaired loans with no related allowance recorded, unpaid principal balance | 3,900,000 | 3,623,000 |
Impaired loans with a related allowance recorded, recorded investment | 109,000 |  |
Impaired loans with a related allowance recorded, unpaid principal balance | 109,000 |  |
Impaired loans, related allowance | 4,000 |  |
Impaired loans, recorded investment | 3,962,000 | 3,621,000 |
Impaired loans, unpaid principal balance | 4,009,000 | 3,623,000 |
Commercial Portfolio Segment [Member] |  |  |
With no allowance recorded, average recorded investment | 2,111,000 | 1,800,000 | 987,000
With no allowance recorded, interest income recognized | 79,000 | 45,000 |
With allowance recorded, average recorded investment |  | 1,714,000 | 474,000
With allowance recorded, interest income recognized |  |  |
Impaired Loans, Average recorded investment | 2,111,000 | 3,514,000 | 1,461,000
Impaired Loans, interest income recognized | 79,000 | 45,000 |
Commercial Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |
Impaired loans with no related allowance recorded, recorded investment | 4,700,000 | 2,057,000 |
Impaired loans with no related allowance recorded, unpaid principal balance | 4,816,000 | 2,060,000 |
Impaired loans, related allowance |  |  |
Impaired loans, recorded investment | 4,700,000 | 2,057,000 |
Impaired loans, unpaid principal balance | 4,816,000 | 2,060,000 |
Consumer Portfolio Segment [Member] |  |  |
With no allowance recorded, average recorded investment | 1,132,000 | 901,000 | 750,000
With no allowance recorded, interest income recognized | 47,000 | 35,000 | 31,000
With allowance recorded, average recorded investment | 39,000 | 18,000 | 9,000
With allowance recorded, interest income recognized |  |  |
Impaired Loans, Average recorded investment | 1,171,000 | 919,000 | 759,000
Impaired Loans, interest income recognized | 47,000 | 35,000 | 31,000
Consumer Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |
Impaired loans with no related allowance recorded, recorded investment | 1,177,000 | 916,000 |
Impaired loans with no related allowance recorded, unpaid principal balance | 1,332,000 | 1,000,000 |
Impaired loans with a related allowance recorded, recorded investment | 10,000 |  |
Impaired loans with a related allowance recorded, unpaid principal balance | 10,000 |  |
Impaired loans, related allowance | 10,000 |  |
Impaired loans, recorded investment | 1,187,000 | 916,000 |
Impaired loans, unpaid principal balance | 1,342,000 | 1,000,000 |
Construction Portfolio Segment [Member] |  |  |
With no allowance recorded, average recorded investment |  | 4,062,000 | 1,354,000
With no allowance recorded, interest income recognized |  |  | 503,000
Impaired Loans, Average recorded investment |  | 4,062,000 | 1,354,000
Impaired Loans, interest income recognized |  |  | $ 503,000

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