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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Impaired loans, related allowance | $ 0 |  | $ 0 |  | $ 1,500,000
Impaired loans, recorded investment | 20,800,000 |  | 20,800,000 |  | 21,200,000
With no allowance recorded, average recorded investment | 20,909,000 | $ 9,374,000 | 19,717,000 | $ 8,295,000 |
With no allowance recorded, interest income recognized | 252,000 | 32,000 | 709,000 | 101,000 |
With allowance recorded, average recorded investment |  | 50,000 | 3,763,000 | 189,000 |
With allowance recorded, interest income recognized |  |  |  |  |
Impaired Loans, Average recorded investment | 20,909,000 | 9,424,000 | 23,480,000 | 8,484,000 |
Impaired Loans, interest income recognized | 252,000 | 32,000 | 709,000 | 101,000 |
Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 20,767,000 |  | 20,767,000 |  | 15,391,000
Impaired loans with no related allowance recorded, unpaid principal balance | 20,900,000 |  | 20,900,000 |  | 16,799,000
Impaired loans with a related allowance recorded, recorded investment |  |  |  |  | 5,827,000
Impaired loans with a related allowance recorded, unpaid principal balance |  |  |  |  | 5,877,000
Impaired loans, related allowance |  |  |  |  | 1,545,000
Impaired loans, recorded investment | 20,767,000 |  | 20,767,000 |  | 21,218,000
Impaired loans, unpaid principal balance | 20,900,000 |  | 20,900,000 |  | 22,676,000
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
With no allowance recorded, average recorded investment | 13,579,000 | 4,062,000 | 9,654,000 | 3,157,000 |
With no allowance recorded, interest income recognized | 164,000 | 21,000 | 324,000 | 70,000 |
With allowance recorded, average recorded investment | 13,579,000 | 4,062,000 | 275,000 |  |
With allowance recorded, interest income recognized | 164,000 | 21,000 |  |  |
Impaired Loans, Average recorded investment |  |  | 9,929,000 | 3,157,000 |
Impaired Loans, interest income recognized |  |  | 324,000 | 70,000 |
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 13,989,000 |  | 13,989,000 |  | 4,606,000
Impaired loans with no related allowance recorded, unpaid principal balance | 14,057,000 |  | 14,057,000 |  | 5,109,000
Impaired loans with a related allowance recorded, recorded investment | 13,989,000 |  | 13,989,000 |  | 4,606,000
Impaired loans with a related allowance recorded, unpaid principal balance | 14,057,000 |  | 14,057,000 |  | 5,109,000
Impaired loans, related allowance |  |  |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |
With no allowance recorded, average recorded investment | 3,696,000 | 3,523,000 | 2,202,000 | 3,451,000 |
With no allowance recorded, interest income recognized | 37,000 | 3,000 | 28,000 | 8,000 |
With allowance recorded, average recorded investment | 3,696,000 | 3,523,000 | 1,237,000 |  |
With allowance recorded, interest income recognized | 37,000 | 3,000 |  |  |
Impaired Loans, Average recorded investment |  |  | 3,439,000 | 3,451,000 |
Impaired Loans, interest income recognized |  |  | 28,000 | 8,000 |
Residential Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 3,640,000 |  | 3,640,000 |  | 670,000
Impaired loans with no related allowance recorded, unpaid principal balance | 3,640,000 |  | 3,640,000 |  | 703,000
Impaired loans with a related allowance recorded, recorded investment |  |  |  |  | 1,632,000
Impaired loans with a related allowance recorded, unpaid principal balance |  |  |  |  | 1,632,000
Impaired loans, related allowance |  |  |  |  | 216,000
Impaired loans, recorded investment | 3,640,000 |  | 3,640,000 |  | 2,302,000
Impaired loans, unpaid principal balance | 3,640,000 |  | 3,640,000 |  | 2,335,000
Commercial Portfolio Segment [Member] |  |  |  |  |
With no allowance recorded, average recorded investment | 2,656,000 | 1,018,000 | 1,684,000 | 948,000 |
With no allowance recorded, interest income recognized | 39,000 |  | 99,000 |  |
With allowance recorded, average recorded investment |  | 45,000 | 2,228,000 | 185,000 |
With allowance recorded, interest income recognized |  |  |  |  |
Impaired Loans, Average recorded investment | 2,656,000 | 1,063,000 | 3,912,000 | 1,133,000 |
Impaired Loans, interest income recognized | 39,000 |  | 99,000 |  |
Commercial Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 2,222,000 |  | 2,222,000 |  | 488,000
Impaired loans with no related allowance recorded, unpaid principal balance | 2,228,000 |  | 2,228,000 |  | 1,281,000
Impaired loans with a related allowance recorded, recorded investment |  |  |  |  | 4,158,000
Impaired loans with a related allowance recorded, unpaid principal balance |  |  |  |  | 4,208,000
Impaired loans, related allowance |  |  |  |  | 1,299,000
Impaired loans, recorded investment | 2,222,000 |  | 2,222,000 |  | 4,646,000
Impaired loans, unpaid principal balance | 2,228,000 |  | 2,228,000 |  | 5,489,000
Consumer Portfolio Segment [Member] |  |  |  |  |
With no allowance recorded, average recorded investment | 978,000 | 771,000 | 897,000 | 739,000 |
With no allowance recorded, interest income recognized | 12,000 | 8,000 | 108,000 | 23,000 |
With allowance recorded, average recorded investment |  | 5,000 | 23,000 | 4,000 |
With allowance recorded, interest income recognized |  |  |  |  |
Impaired Loans, Average recorded investment | 978,000 | 776,000 | 920,000 | 743,000 |
Impaired Loans, interest income recognized | 12,000 | $ 8,000 | 108,000 | 23,000 |
Consumer Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment | 916,000 |  | 916,000 |  | 827,000
Impaired loans with no related allowance recorded, unpaid principal balance | 975,000 |  | 975,000 |  | 867,000
Impaired loans with a related allowance recorded, recorded investment |  |  |  |  | 37,000
Impaired loans with a related allowance recorded, unpaid principal balance |  |  |  |  | 37,000
Impaired loans, related allowance |  |  |  |  | 30,000
Impaired loans, recorded investment | 916,000 |  | 916,000 |  | 864,000
Impaired loans, unpaid principal balance | 975,000 |  | 975,000 |  | 904,000
Construction Portfolio Segment [Member] |  |  |  |  |
With no allowance recorded, average recorded investment |  |  | 5,280,000 |  |
With no allowance recorded, interest income recognized |  |  | 150,000 |  |
With allowance recorded, average recorded investment |  |  | 5,280,000 |  |
With allowance recorded, interest income recognized |  |  | 150,000 |  |
Construction Portfolio Segment [Member] | Business Activities Loans [Member] |  |  |  |  |
Impaired loans with no related allowance recorded, recorded investment |  |  |  |  | 8,800,000
Impaired loans with no related allowance recorded, unpaid principal balance |  |  |  |  | 8,839,000
Impaired loans with a related allowance recorded, recorded investment |  |  |  |  | 8,800,000
Impaired loans with a related allowance recorded, unpaid principal balance |  |  |  |  | 8,839,000
Impaired loans, related allowance |  |  |  |  |

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