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Note 3 - Loans - Impaired Loan Data (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Unpaid contractual principal balance with no related allowance | $ 18,671 | $ 24,395 | $ 20,807
Impaired balance with no related allowance | 17,860 | 23,956 | 20,274
Average recorded investment with no related allowance | 19,554 | 21,814 | 21,504
Interest income recognized with no related allowance | 625 | 585 | 712
Interest income collected with no related allowance | 645 | 714 | 835
Unpaid contractual principal balance with an allowance | 8,031 | 9,629 | 10,485
Impaired balance with an allowance | 8,031 | 9,622 | 10,387
Related allowance | 1,585 | 2,960 | 3,435
Average recorded investment with an allowance | 7,947 | 9,741 | 9,871
Interest income recognized with an allowance | 239 | 197 | 289
Interest income collected with an allowance | 252 | 193 | 291
Unpaid contractual principal balance | 26,702 | 34,024 | 31,292
Impaired balance | 25,891 | 33,578 | 30,661
Average recorded investment | 27,501 | 31,555 | 31,375
Interest income recognized | 864 | 782 | 1,001
Interest income collected | 897 | 907 | 1,126
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 653 | 646 | 635
Impaired balance with no related allowance | 653 | 646 | 635
Average recorded investment with no related allowance | 642 | 515 | 539
Interest income recognized with no related allowance | 28 | 15 | 24
Interest income collected with no related allowance | 28 | 18 | 27
Unpaid contractual principal balance with an allowance | 0 | 0 | 0
Impaired balance with an allowance | 0 | 0 | 0
Related allowance | 0 | 0 | 0
Average recorded investment with an allowance | 0 | 38 | 30
Interest income recognized with an allowance | 0 | 0 | 0
Interest income collected with an allowance | 0 | 0 | 0
Unpaid contractual principal balance | 653 | 646 | 635
Impaired balance | 653 | 646 | 635
Average recorded investment | 642 | 553 | 569
Interest income recognized | 28 | 15 | 24
Interest income collected | 28 | 18 | 27
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 342 | 301 | 229
Impaired balance with no related allowance | 322 | 280 | 209
Average recorded investment with no related allowance | 271 | 211 | 210
Interest income recognized with no related allowance | 5 | 5 | 9
Interest income collected with no related allowance | 12 | 13 | 12
Unpaid contractual principal balance with an allowance | 0 | 0 | 0
Impaired balance with an allowance | 0 | 0 | 0
Related allowance | 0 | 0 | 0
Average recorded investment with an allowance | 0 | 0 | 0
Interest income recognized with an allowance | 0 | 0 | 0
Interest income collected with an allowance | 0 | 0 | 0
Unpaid contractual principal balance | 342 | 301 | 229
Impaired balance | 322 | 280 | 209
Average recorded investment | 271 | 211 | 210
Interest income recognized | 5 | 5 | 9
Interest income collected | 12 | 13 | 12
Real Estate Portfolio Segment [Member] | Commercial [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 10,775 | 16,457 | 14,358
Impaired balance with no related allowance | 10,775 | 16,367 | 14,276
Average recorded investment with no related allowance | 12,851 | 14,274 | 14,275
Interest income recognized with no related allowance | 368 | 490 | 567
Interest income collected with no related allowance | 356 | 480 | 560
Unpaid contractual principal balance with an allowance | 7,124 | 8,316 | 8,557
Impaired balance with an allowance | 7,124 | 8,316 | 8,467
Related allowance | 1,471 | 2,470 | 3,022
Average recorded investment with an allowance | 6,817 | 8,308 | 8,340
Interest income recognized with an allowance | 201 | 177 | 239
Interest income collected with an allowance | 202 | 173 | 236
Unpaid contractual principal balance | 17,899 | 24,773 | 22,915
Impaired balance | 17,899 | 24,683 | 22,743
Average recorded investment | 19,668 | 22,582 | 22,615
Interest income recognized | 569 | 667 | 806
Interest income collected | 558 | 653 | 796
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 176 | 508 | 191
Impaired balance with no related allowance | 176 | 508 | 191
Average recorded investment with no related allowance | 163 | 825 | 698
Interest income recognized with no related allowance | 4 | 16 | 7
Interest income collected with no related allowance | 5 | 15 | 7
Unpaid contractual principal balance with an allowance | 497 | 73 | 72
Impaired balance with an allowance | 497 | 73 | 72
Related allowance | 69 | 22 | 21
Average recorded investment with an allowance | 178 | 74 | 74
Interest income recognized with an allowance | 22 | 0 | 1
Interest income collected with an allowance | 32 | 0 | 2
Unpaid contractual principal balance | 673 | 581 | 263
Impaired balance | 673 | 581 | 263
Average recorded investment | 341 | 899 | 772
Interest income recognized | 26 | 16 | 8
Interest income collected | 37 | 15 | 9
Real Estate Portfolio Segment [Member] | Residential Construction [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 198 | 0 | 0
Impaired balance with no related allowance | 198 | 0 | 0
Average recorded investment with no related allowance | 99 | 0 | 0
Interest income recognized with no related allowance | 5 | 0 | 0
Interest income collected with no related allowance | 5 | 0 | 0
Unpaid contractual principal balance with an allowance | 0 | 0 | 0
Impaired balance with an allowance | 0 | 0 | 0
Related allowance | 0 | 0 |
Average recorded investment with an allowance | 0 | 0 | 0
Interest income recognized with an allowance | 0 | 0 | 0
Interest income collected with an allowance | 0 | 0 | 0
Unpaid contractual principal balance | 198 | 0 | 0
Impaired balance | 198 | 0 | 0
Average recorded investment | 99 | 0 | 0
Interest income recognized | 5 | 0 | 0
Interest income collected | 5 | 0 | 0
Real Estate Portfolio Segment [Member] | Residential [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 5,506 | 5,321 | 4,261
Impaired balance with no related allowance | 4,718 | 4,995 | 3,952
Average recorded investment with no related allowance | 4,563 | 4,704 | 4,553
Interest income recognized with no related allowance | 156 | 56 | 73
Interest income collected with no related allowance | 176 | 178 | 191
Unpaid contractual principal balance with an allowance | 37 | 858 | 1,476
Impaired balance with an allowance | 37 | 851 | 1,468
Related allowance | 21 | 435 | 363
Average recorded investment with an allowance | 575 | 936 | 1,043
Interest income recognized with an allowance | (1) | 4 | 28
Interest income collected with an allowance | 2 | 6 | 32
Unpaid contractual principal balance | 5,543 | 6,179 | 5,737
Impaired balance | 4,755 | 5,846 | 5,420
Average recorded investment | 5,138 | 5,640 | 5,596
Interest income recognized | 155 | 60 | 101
Interest income collected | 178 | 184 | 223
Real Estate Portfolio Segment [Member] | Farmland [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 841 | 921 | 921
Impaired balance with no related allowance | 839 | 919 | 799
Average recorded investment with no related allowance | 779 | 1,071 | 1,016
Interest income recognized with no related allowance | 54 | (4) | 22
Interest income collected with no related allowance | 58 | 1 | 26
Unpaid contractual principal balance with an allowance | 373 | 382 | 380
Impaired balance with an allowance | 373 | 382 | 380
Related allowance | 24 | 33 | 29
Average recorded investment with an allowance | 377 | 385 | 384
Interest income recognized with an allowance | 17 | 16 | 21
Interest income collected with an allowance | 16 | 14 | 21
Unpaid contractual principal balance | 1,214 | 1,303 | 1,301
Impaired balance | 1,212 | 1,301 | 1,179
Average recorded investment | 1,156 | 1,456 | 1,400
Interest income recognized | 71 | 12 | 43
Interest income collected | 74 | 15 | 47
Consumer and Other Portfolio Segment [Member] | Consumer [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 180 | 241 | 212
Impaired balance with no related allowance | 179 | 241 | 212
Average recorded investment with no related allowance | 186 | 214 | 213
Interest income recognized with no related allowance | 5 | 7 | 10
Interest income collected with no related allowance | 5 | 9 | 12
Unpaid contractual principal balance with an allowance | 0 | 0 | 0
Impaired balance with an allowance | 0 | 0 | 0
Related allowance | 0 | 0 | 0
Average recorded investment with an allowance | 0 | 0 | 0
Interest income recognized with an allowance | 0 | 0 | 0
Interest income collected with an allowance | 0 | 0 | 0
Unpaid contractual principal balance | 180 | 241 | 212
Impaired balance | 179 | 241 | 212
Average recorded investment | 186 | 214 | 213
Interest income recognized | 5 | 7 | 10
Interest income collected | 5 | 9 | $ 12
Consumer and Other Portfolio Segment [Member] | Other [Member] |  |  |
Unpaid contractual principal balance with no related allowance | 0 | 0 |
Impaired balance with no related allowance | 0 | 0 |
Average recorded investment with no related allowance | 0 | 0 |
Interest income recognized with no related allowance | 0 | 0 |
Interest income collected with no related allowance | 0 | 0 |
Unpaid contractual principal balance with an allowance | 0 | 0 |
Impaired balance with an allowance | 0 | 0 |
Related allowance | 0 | 0 |
Average recorded investment with an allowance | 0 | 0 |
Interest income recognized with an allowance | 0 | 0 |
Interest income collected with an allowance | 0 | 0 |
Unpaid contractual principal balance | 0 | 0 |
Impaired balance | 0 | 0 |
Average recorded investment | 0 | 0 |
Interest income recognized | 0 | 0 |
Interest income collected | $ 0 | $ 0 |

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