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Note 5 - Loans and Allowance for Credit Losses - Impaired Loans (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Commercial Portfolio Segment [Member] | Quarter to Date [Member] |  |  |  |  |  |
Average Recorded Investment | $ 12,838,000 | $ 9,671,000 | $ 7,978,000 |  |  |
Interest Income Recognized | 54 | 21 | 39 |  |  |
Commercial Portfolio Segment [Member] | Year to Date [Member] |  |  |  |  |  |
Average Recorded Investment |  |  |  | $ 12,879,000 | $ 10,047,000 | $ 10,309,000
Interest Income Recognized |  |  |  | 112 | 48 | 69
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Unpaid Contractual Principal Balance | 15,517,000 | 16,123,000 | 14,041,000 | 15,517,000 | 14,041,000 | 16,123,000
Recorded Investment With No Allowance | 2,370,000 | 2,396,000 | 2,663,000 | 2,370,000 | 2,663,000 | 2,396,000
Recorded Investment With Allowance | 10,078,000 | 10,612,000 | 10,206,000 | 10,078,000 | 10,206,000 | 10,612,000
Total Recorded Investment | 12,448,000 | 13,008,000 | 12,869,000 | 12,448,000 | 12,869,000 | 13,008,000
Related Allowance | 1,997,000 | 3,478,000 | 2,312,000 | 1,997,000 | 2,312,000 | 3,478,000
Income Producing Portfolio Segment [Member] | Quarter to Date [Member] |  |  |  |  |  |
Average Recorded Investment | 17,584,000 | 10,675,000 | 12,542,000 |  |  |
Interest Income Recognized | 28 | 95 | 188 |  |  |
Income Producing Portfolio Segment [Member] | Year to Date [Member] |  |  |  |  |  |
Average Recorded Investment |  |  |  | 15,298,000 | 11,388,000 | 10,294,000
Interest Income Recognized |  |  |  | 144 | 259 | 354
Income Producing Portfolio Segment [Member] |  |  |  |  |  |
Unpaid Contractual Principal Balance | 14,648,000 | 6,811,000 | 15,389,000 | 14,648,000 | 15,389,000 | 6,811,000
Recorded Investment With No Allowance |  | 1,190,000 |  |  |  | 1,190,000
Recorded Investment With Allowance | 14,648,000 | 4,928,000 | 6,877,000 | 14,648,000 | 6,877,000 | 4,928,000
Total Recorded Investment | 14,648,000 | 6,118,000 | 6,877,000 | 14,648,000 | 6,877,000 | 6,118,000
Related Allowance | 1,714,000 | 1,033,000 | 827,000 | 1,714,000 | 827,000 | 1,033,000
Owner Occupied Portfolio Segment [Member] | Quarter to Date [Member] |  |  |  |  |  |
Average Recorded Investment | 2,108,000 | 1,772,000 | 1,811,000 |  |  |
Interest Income Recognized | 13 |  |  |  |  |
Owner Occupied Portfolio Segment [Member] | Year to Date [Member] |  |  |  |  |  |
Average Recorded Investment |  |  |  | 1,923,000 | 1,844,000 | 1,810,000
Interest Income Recognized |  |  |  | 13 |  |
Owner Occupied Portfolio Segment [Member] |  |  |  |  |  |
Unpaid Contractual Principal Balance | 2,517,000 | 1,753,000 | 2,299,000 | 2,517,000 | 2,299,000 | 1,753,000
Recorded Investment With No Allowance |  | 946,000 | 973,000 |  | 973,000 | 946,000
Recorded Investment With Allowance | 2,517,000 | 807,000 | 817,000 | 2,517,000 | 817,000 | 807,000
Total Recorded Investment | 2,517,000 | 1,753,000 | 1,790,000 | 2,517,000 | 1,790,000 | 1,753,000
Related Allowance | 360,000 | 400,000 | 400,000 | 360,000 | 400,000 | 400,000
Residential Portfolio Segment [Member] | Quarter to Date [Member] |  |  |  |  |  |
Average Recorded Investment | 249,000 |  | 5,961,000 |  |  |
Interest Income Recognized |  |  | 100 |  |  |
Residential Portfolio Segment [Member] | Year to Date [Member] |  |  |  |  |  |
Average Recorded Investment |  |  |  | 271,000 | 7,516,000 |
Interest Income Recognized |  |  |  |  | 298 |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Unpaid Contractual Principal Balance | 244,000 |  | 22,681,000 | 244,000 | 22,681,000 |
Recorded Investment With No Allowance | 244,000 |  | 5,370,000 | 244,000 | 5,370,000 |
Recorded Investment With Allowance |  |  | 12,274,000 |  | 12,274,000 |
Total Recorded Investment | 244,000 |  | 17,644,000 | 244,000 | 17,644,000 |
Related Allowance |  |  | 350,000 |  | 350,000 |
Construction Portfolio Segment [Member] | Quarter to Date [Member] |  |  |  |  |  |
Average Recorded Investment | 5,146,000 | 8,031,000 |  |  |  |
Interest Income Recognized |  | (93) |  |  |  |
Construction Portfolio Segment [Member] | Year to Date [Member] |  |  |  |  |  |
Average Recorded Investment |  |  |  | 6,542,000 |  | 7,594,000
Interest Income Recognized |  |  |  |  |  | 205
Construction Portfolio Segment [Member] |  |  |  |  |  |
Unpaid Contractual Principal Balance | 4,878,000 | 10,454,000 |  | 4,878,000 |  | 10,454,000
Recorded Investment With No Allowance | 4,340,000 | 4,877,000 |  | 4,340,000 |  | 4,877,000
Recorded Investment With Allowance | 538,000 | 5,577,000 |  | 538,000 |  | 5,577,000
Total Recorded Investment | 4,878,000 | 10,454,000 |  | 4,878,000 |  | 10,454,000
Related Allowance | 300,000 | 950,000 |  | 300,000 |  | 950,000
Home Equity Portfolio Segment [Member] | Quarter to Date [Member] |  |  |  |  |  |
Average Recorded Investment | 117,000 | 411,000 | 774,000 |  |  |
Interest Income Recognized | 2 |  |  |  |  |
Home Equity Portfolio Segment [Member] | Year to Date [Member] |  |  |  |  |  |
Average Recorded Investment |  |  |  | 129,000 | 959,000 | 650,000
Interest Income Recognized |  |  |  | 2 |  |
Home Equity Portfolio Segment [Member] |  |  |  |  |  |
Unpaid Contractual Principal Balance | 113,000 | 161,000 | 661,000 | 113,000 | 661,000 | 161,000
Recorded Investment With No Allowance |  | 116,000 | 116,000 |  | 116,000 | 116,000
Recorded Investment With Allowance | 113,000 | 45,000 | 545,000 | 113,000 | 545,000 | 45,000
Total Recorded Investment | 113,000 | 161,000 | 661,000 | 113,000 | 661,000 | 161,000
Related Allowance | 100,000 | 38,000 | 338,000 | 100,000 | 338,000 | 38,000
Other Consumer Portfolio Segment [Member] | Quarter to Date [Member] |  |  |  |  |  |
Average Recorded Investment |  | 47,000 | 45,000 |  |  |
Interest Income Recognized |  | (1) | 1 |  |  |
Other Consumer Portfolio Segment [Member] | Year to Date [Member] |  |  |  |  |  |
Average Recorded Investment |  |  |  | 6,000 | 40,000 | 31,000
Interest Income Recognized |  |  |  |  | 2 | 1
Other Consumer Portfolio Segment [Member] |  |  |  |  |  |
Unpaid Contractual Principal Balance |  | 22,000 | 72,000 |  | 72,000 | 22,000
Recorded Investment With No Allowance |  | 19,000 | 72,000 |  | 72,000 | 19,000
Recorded Investment With Allowance |  | 3,000 |  |  |  | 3,000
Total Recorded Investment |  | 22,000 | 72,000 |  | 72,000 | 22,000
Related Allowance |  | 3,000 |  |  |  | 3,000
Quarter to Date [Member] |  |  |  |  |  |
Average Recorded Investment | 38,042,000 | 30,607,000 | 29,111,000 |  |  |
Interest Income Recognized | 97 | 22 | 328 |  |  |
Year to Date [Member] |  |  |  |  |  |
Average Recorded Investment |  |  |  | 37,048,000 | 31,794,000 | 30,688,000
Interest Income Recognized |  |  |  | 271 | 607 | 629
Unpaid Contractual Principal Balance | 37,917,000 | 35,324,000 | 55,143,000 | 37,917,000 | 55,143,000 | 35,324,000
Recorded Investment With No Allowance | 6,954,000 | 9,544,000 | 9,194,000 | 6,954,000 | 9,194,000 | 9,544,000
Recorded Investment With Allowance | 27,894,000 | 21,972,000 | 30,719,000 | 27,894,000 | 30,719,000 | 21,972,000
Total Recorded Investment | 34,848,000 | 31,516,000 | 39,913,000 | 34,848,000 | 39,913,000 | 31,516,000
Related Allowance | $ 4,471,000 | $ 5,902,000 | $ 4,227,000 | $ 4,471,000 | $ 4,227,000 | $ 5,902,000

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