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Note 4 - Loans - Impaired Loan Data (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Related allowance | $ 3,155,000 | $ 1,418,000
Unpaid contractual principal balance | 24,957,000 | 24,580,000
Impaired balance | 23,955,000 | 24,473,000
Average recorded investment | 24,071,000 | 23,705,000
Financial Asset Originated [Member] |  |
Unpaid contractual principal balance with no related allowance | 15,485,000 | 19,810,000
Impaired balance with no related allowance | 14,674,000 | 19,703,000
Average recorded investment with no related allowance | 18,818,000 | 17,644,000
Unpaid contractual principal balance with an allowance | 9,325,000 | 4,770,000
Impaired balance with an allowance | 9,134,000 | 4,770,000
Related allowance | 3,149,000 | 1,418,000
Average recorded investment with an allowance | 5,067,000 | 6,061,000
Financial Asset Acquired with Credit Deterioration [Member] |  |
Related allowance | 6,000 | 0
Unpaid contractual principal balance | 147,000 |
Impaired balance | 147,000 | 0
Average recorded investment | 186,000 |
Residential Mortgage [Member] |  |
Related allowance | 143,000 | 61,000
Unpaid contractual principal balance | 3,474,000 | 4,488,000
Impaired balance | 3,482,000 | 4,404,000
Average recorded investment | 4,084,000 | 4,165,000
Residential Mortgage [Member] | Financial Asset Originated [Member] |  |
Unpaid contractual principal balance with no related allowance | 2,706,000 | 4,214,000
Impaired balance with no related allowance | 2,711,000 | 4,130,000
Average recorded investment with no related allowance | 3,693,000 | 4,067,000
Unpaid contractual principal balance with an allowance | 757,000 | 274,000
Impaired balance with an allowance | 760,000 | 274,000
Related allowance | 137,000 | 61,000
Average recorded investment with an allowance | 367,000 | 98,000
Residential Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |
Related allowance | 6,000 |
Unpaid contractual principal balance | 11,000 |
Impaired balance | 11,000 |
Average recorded investment | 24,000 |
Commercial, Financial, and Agricultural [Member] |  |
Related allowance | 1,073,000 | 6,000
Unpaid contractual principal balance | 2,483,000 | 1,071,000
Impaired balance | 2,283,000 | 1,050,000
Average recorded investment | 1,679,000 | 917,000
Commercial, Financial, and Agricultural [Member] | Financial Asset Originated [Member] |  |
Unpaid contractual principal balance with no related allowance | 257,000 | 1,029,000
Impaired balance with no related allowance | 257,000 | 1,008,000
Average recorded investment with no related allowance | 910,000 | 909,000
Unpaid contractual principal balance with an allowance | 2,189,000 | 42,000
Impaired balance with an allowance | 1,989,000 | 42,000
Related allowance | 1,073,000 | 6,000
Average recorded investment with an allowance | 722,000 | 8,000
Commercial, Financial, and Agricultural [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |
Related allowance |  |
Unpaid contractual principal balance | 37,000 |
Impaired balance | 37,000 |
Average recorded investment | 47,000 |
Consumer and Other [Member] |  |
Related allowance |  |
Unpaid contractual principal balance |  | 217,000
Impaired balance |  | 217,000
Average recorded investment | 123,000 | 198,000
Consumer and Other [Member] | Financial Asset Originated [Member] |  |
Unpaid contractual principal balance with no related allowance |  | 217,000
Impaired balance with no related allowance |  | 217,000
Average recorded investment with no related allowance | 123,000 | 198,000
Unpaid contractual principal balance with an allowance |  |
Impaired balance with an allowance |  |
Related allowance |  |
Average recorded investment with an allowance |  |
Consumer and Other [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |
Related allowance |  |
Unpaid contractual principal balance |  |
Impaired balance |  |
Average recorded investment |  |
Commercial Real Estate Portfolio Segment [Member] |  |
Related allowance | 1,939,000 | 1,312,000
Unpaid contractual principal balance | 18,868,000 | 18,273,000
Impaired balance | 18,058,000 | 18,271,000
Average recorded investment | 17,857,000 | 17,890,000
Commercial Real Estate Portfolio Segment [Member] | Financial Asset Originated [Member] |  |
Unpaid contractual principal balance with no related allowance | 12,455,000 | 14,218,000
Impaired balance with no related allowance | 11,639,000 | 14,216,000
Average recorded investment with no related allowance | 13,924,000 | 12,401,000
Unpaid contractual principal balance with an allowance | 6,379,000 | 4,055,000
Impaired balance with an allowance | 6,385,000 | 4,055,000
Related allowance | 1,939,000 | 1,312,000
Average recorded investment with an allowance | 3,898,000 | 5,489,000
Commercial Real Estate Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |
Related allowance |  |
Unpaid contractual principal balance | 34,000 |
Impaired balance | 34,000 |
Average recorded investment | 35,000 |
Commercial Real Estate Portfolio Segment [Member] | Construction, Land, and Land Development [Member] |  |
Related allowance |  | 39,000
Unpaid contractual principal balance | 132,000 | 531,000
Impaired balance | 132,000 | 531,000
Average recorded investment | 328,000 | 535,000
Commercial Real Estate Portfolio Segment [Member] | Construction, Land, and Land Development [Member] | Financial Asset Originated [Member] |  |
Unpaid contractual principal balance with no related allowance | 67,000 | 132,000
Impaired balance with no related allowance | 67,000 | 132,000
Average recorded investment with no related allowance | 168,000 | 69,000
Unpaid contractual principal balance with an allowance |  | 399,000
Impaired balance with an allowance |  | 399,000
Related allowance |  | 39,000
Average recorded investment with an allowance | 80,000 | $ 466,000
Commercial Real Estate Portfolio Segment [Member] | Construction, Land, and Land Development [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |
Related allowance |  |
Unpaid contractual principal balance | 65,000 |
Impaired balance | 65,000 |
Average recorded investment | $ 80,000 |

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