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Note 4 - Loans Receivable and Allowance for Loan and Lease Losses - Impaired Loans (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Impaired loans, related allowance | $ 1,600,000 |  | $ 1,600,000 |  | $ 1,500,000
Impaired loans, recorded investment | 22,200,000 |  | 22,200,000 |  | 19,600,000
With no allowance recorded, average recorded investment | 13,653,000 | $ 20,909,000 | 12,342,000 | $ 19,717,000 |
With no allowance recorded, interest income recognized | 37,000 | 252,000 | 114,000 | 709,000 |
With allowance recorded, average recorded investment | 9,104,000 |  | 8,959,000 | 3,763,000 |
With allowance recorded, interest income recognized | 2,000 |  | 43,000 |  |
Impaired Loans, Average recorded investment | 22,757,000 | 20,909,000 | 21,301,000 | 23,480,000 |
Impaired Loans, interest income recognized | 39,000 | 252,000 | 157,000 | 709,000 |
Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 13,096,000 |  | 13,096,000 |  | 10,828,000
Impaired loans with no related allowance recorded, unpaid principal balance | 13,855,000 |  | 13,855,000 |  | 10,992,000
Impaired loans with a related allowance recorded, recorded investment | 9,069,000 |  | 9,069,000 |  | 8,800,000
Impaired loans with a related allowance recorded, unpaid principal balance | 9,069,000 |  | 9,069,000 |  | 8,800,000
Impaired loans, related allowance | 1,568,000 |  | 1,568,000 |  | 1,496,000
Impaired loans, recorded investment | 22,165,000 |  | 22,165,000 |  | 19,628,000
Impaired loans, unpaid principal balance | 22,924,000 |  | 22,924,000 |  | 19,792,000
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
With no allowance recorded, average recorded investment | 6,975,000 | 13,579,000 | 5,702,000 | 9,654,000 |
With no allowance recorded, interest income recognized | 13,000 | 164,000 | 39,000 | 324,000 |
With allowance recorded, average recorded investment | 8,975,000 |  | 8,876,000 | 275,000 |
With allowance recorded, interest income recognized |  |  | 35,000 |  |
Impaired Loans, Average recorded investment | 15,950,000 | 13,579,000 | 14,578,000 | 9,929,000 |
Impaired Loans, interest income recognized | 13,000 | 164,000 | 74,000 | 324,000 |
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 6,710,000 |  | 6,710,000 |  | 4,234,000
Impaired loans with no related allowance recorded, unpaid principal balance | 7,116,000 |  | 7,116,000 |  | 4,309,000
Impaired loans with a related allowance recorded, recorded investment | 8,811,000 |  | 8,811,000 |  | 8,800,000
Impaired loans with a related allowance recorded, unpaid principal balance | 8,811,000 |  | 8,811,000 |  | 8,800,000
Impaired loans, related allowance | 1,552,000 |  | 1,552,000 |  | 1,496,000
Impaired loans, recorded investment | 15,521,000 |  | 15,521,000 |  | 13,034,000
Impaired loans, unpaid principal balance | 15,927,000 |  | 15,927,000 |  | 13,109,000
Residential Portfolio Segment [Member] |  |  |  |  |
With no allowance recorded, average recorded investment | 3,641,000 | 3,696,000 | 3,603,000 | 2,202,000 |
With no allowance recorded, interest income recognized | 12,000 | 37,000 | 45,000 | 28,000 |
With allowance recorded, average recorded investment | 55,000 |  | 33,000 | 1,237,000 |
With allowance recorded, interest income recognized | 1,000 |  | 4,000 |  |
Impaired Loans, Average recorded investment | 3,696,000 | 3,696,000 | 3,636,000 | 3,439,000 |
Impaired Loans, interest income recognized | 13,000 | 37,000 | 49,000 | 28,000 |
Residential Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 3,565,000 |  | 3,565,000 |  | 3,621,000
Impaired loans with no related allowance recorded, unpaid principal balance | 3,634,000 |  | 3,634,000 |  | 3,623,000
Impaired loans with a related allowance recorded, recorded investment | 109,000 |  | 109,000 |  |
Impaired loans with a related allowance recorded, unpaid principal balance | 109,000 |  | 109,000 |  |
Impaired loans, related allowance | 5,000 |  | 5,000 |  |
Impaired loans, recorded investment | 3,674,000 |  | 3,674,000 |  | 3,621,000
Impaired loans, unpaid principal balance | 3,743,000 |  | 3,743,000 |  | 3,623,000
Commercial Portfolio Segment [Member] |  |  |  |  |
With no allowance recorded, average recorded investment | 1,716,000 | 2,656,000 | 1,936,000 | 1,684,000 |
With no allowance recorded, interest income recognized | 2,000 | 39,000 | 4,000 | 99,000 |
With allowance recorded, average recorded investment |  |  |  | 2,228,000 |
With allowance recorded, interest income recognized |  |  |  |  |
Impaired Loans, Average recorded investment | 1,716,000 | 2,656,000 | 1,936,000 | 3,912,000 |
Impaired Loans, interest income recognized | 2,000 | 39,000 | 4,000 | 99,000 |
Commercial Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 1,706,000 |  | 1,706,000 |  | 2,057,000
Impaired loans with no related allowance recorded, unpaid principal balance | 1,840,000 |  | 1,840,000 |  | 2,060,000
Impaired loans, related allowance |  |  |  |  |
Impaired loans, recorded investment | 1,706,000 |  | 1,706,000 |  | 2,057,000
Impaired loans, unpaid principal balance | 1,840,000 |  | 1,840,000 |  | 2,060,000
Consumer Portfolio Segment [Member] |  |  |  |  |
With no allowance recorded, average recorded investment | 1,321,000 | 978,000 | 1,101,000 | 897,000 |
With no allowance recorded, interest income recognized | 10,000 | 12,000 | 26,000 | 108,000 |
With allowance recorded, average recorded investment | 74,000 |  | 50,000 | 23,000 |
With allowance recorded, interest income recognized | 1,000 |  | 4,000 |  |
Impaired Loans, Average recorded investment | 1,395,000 | 978,000 | 1,151,000 | 920,000 |
Impaired Loans, interest income recognized | 11,000 | 12,000 | 30,000 | 108,000 |
Consumer Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 1,115,000 |  | 1,115,000 |  | 916,000
Impaired loans with no related allowance recorded, unpaid principal balance | 1,265,000 |  | 1,265,000 |  | 1,000,000
Impaired loans with a related allowance recorded, recorded investment | 149,000 |  | 149,000 |  |
Impaired loans with a related allowance recorded, unpaid principal balance | 149,000 |  | 149,000 |  |
Impaired loans, related allowance | 11,000 |  | 11,000 |  |
Impaired loans, recorded investment | 1,264,000 |  | 1,264,000 |  | 916,000
Impaired loans, unpaid principal balance | 1,414,000 |  | 1,414,000 |  | $ 1,000,000
Construction Portfolio Segment [Member] |  |  |  |  |
With no allowance recorded, average recorded investment |  |  |  | 5,280,000 |
With no allowance recorded, interest income recognized |  |  |  | 150,000 |
Impaired Loans, Average recorded investment |  |  |  | 5,280,000 |
Impaired Loans, interest income recognized |  |  |  | $ 150,000 |

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