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Note 3 - Loans - Impaired Loan Data (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Unpaid contractual principal balance with no related allowance $ 16,972 $ 18,671 $ 19,781
Impaired balance with no related allowance 16,863 17,860 19,295
Average recorded investment with no related allowance 17,130 19,554 19,502
Interest income recognized with no related allowance 571 625 882
Interest income collected with no related allowance 621 645 901
Unpaid contractual principal balance with an allowance 6,672 8,031 6,702
Impaired balance with an allowance 6,672 8,031 6,702
Related allowance 1,487 1,585 1,827
Average recorded investment with an allowance 6,383 7,947 7,698
Interest income recognized with an allowance 208 239 278
Interest income collected with an allowance 210 252 299
Unpaid contractual principal balance 23,644 26,702 26,483
Impaired balance 23,535 25,891 25,997
Average recorded investment 23,513 27,501 27,200
Interest income recognized 779 864 1,160
Interest income collected 831 897 1,200
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member]      
Unpaid contractual principal balance with no related allowance 472 653 599
Impaired balance with no related allowance 472 653  
Average recorded investment with no related allowance 508 642 634
Interest income recognized with no related allowance 13 28 33
Interest income collected with no related allowance 15 28 34
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 472 653 599
Impaired balance 472 653 599
Average recorded investment 508 642 634
Interest income recognized 13 28 33
Interest income collected 15 28 34
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member]      
Unpaid contractual principal balance with no related allowance 444 342 485
Impaired balance with no related allowance 423 322 398
Average recorded investment with no related allowance 375 271 297
Interest income recognized with no related allowance 14 5 11
Interest income collected with no related allowance 21 12 19
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 444 342 485
Impaired balance 423 322 398
Average recorded investment 375 271 297
Interest income recognized 14 5 11
Interest income collected 21 12 19
Real Estate Portfolio Segment [Member] | Commercial [Member]      
Unpaid contractual principal balance with no related allowance 9,758 10,775 12,637
Impaired balance with no related allowance 9,758 10,775 12,637
Average recorded investment with no related allowance 10,759 12,851 12,808
Interest income recognized with no related allowance 345 368 560
Interest income collected with no related allowance 352 356 550
Unpaid contractual principal balance with an allowance 5,800 7,124 5,729
Impaired balance with an allowance 5,800 7,124 5,729
Related allowance 1,394 1,471 1,713
Average recorded investment with an allowance 5,478 6,817 6,599
Interest income recognized with an allowance 185 201 229
Interest income collected with an allowance 187 202 237
Unpaid contractual principal balance 15,558 17,899 18,366
Impaired balance 15,558 17,899 18,366
Average recorded investment 16,237 19,668 19,407
Interest income recognized 530 569 789
Interest income collected 539 558 787
Real Estate Portfolio Segment [Member] | Commercial Construction [Member]      
Unpaid contractual principal balance with no related allowance 102 176 54
Impaired balance with no related allowance 102 176 54
Average recorded investment with no related allowance 54 163 141
Interest income recognized with no related allowance 3 4 3
Interest income collected with no related allowance 3 5 4
Unpaid contractual principal balance with an allowance 471 497 493
Impaired balance with an allowance 471 497 493
Related allowance 44 69 66
Average recorded investment with an allowance 483 178 241
Interest income recognized with an allowance 3 22 23
Interest income collected with an allowance 3 32 33
Unpaid contractual principal balance 573 673 547
Impaired balance 573 673 547
Average recorded investment 537 341 382
Interest income recognized 6 26 26
Interest income collected 6 37 37
Real Estate Portfolio Segment [Member] | Residential Construction [Member]      
Unpaid contractual principal balance with no related allowance 0 198 0
Impaired balance with no related allowance 0 198 0
Average recorded investment with no related allowance 0 99 79
Interest income recognized with no related allowance 0 5 0
Interest income collected with no related allowance 0 5 0
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 0 198 0
Impaired balance 0 198 0
Average recorded investment 0 99 79
Interest income recognized 0 5 0
Interest income collected 0 5 0
Real Estate Portfolio Segment [Member] | Residential [Member]      
Unpaid contractual principal balance with no related allowance 3,954 5,506 4,978
Impaired balance with no related allowance 3,868 4,718 4,580
Average recorded investment with no related allowance 4,052 4,563 4,566
Interest income recognized with no related allowance 141 156 212
Interest income collected with no related allowance 145 176 227
Unpaid contractual principal balance with an allowance 35 37 109
Impaired balance with an allowance 35 37 109
Related allowance 20 21 27
Average recorded investment with an allowance 54 575 482
Interest income recognized with an allowance 2 (1) 4
Interest income collected with an allowance 2 2 7
Unpaid contractual principal balance 3,989 5,543 5,087
Impaired balance 3,903 4,755 4,689
Average recorded investment 4,106 5,138 5,048
Interest income recognized 143 155 216
Interest income collected 147 178 234
Real Estate Portfolio Segment [Member] | Farmland [Member]      
Unpaid contractual principal balance with no related allowance 2,067 841 840
Impaired balance with no related allowance 2,065 839 839
Average recorded investment with no related allowance 1,189 779 791
Interest income recognized with no related allowance 46 54 54
Interest income collected with no related allowance 75 58 58
Unpaid contractual principal balance with an allowance 366 373 371
Impaired balance with an allowance 366 373 371
Related allowance 29 24 21
Average recorded investment with an allowance 368 377 376
Interest income recognized with an allowance 18 17 22
Interest income collected with an allowance 18 16 22
Unpaid contractual principal balance 2,433 1,214 1,211
Impaired balance 2,431 1,212 1,210
Average recorded investment 1,557 1,156 1,167
Interest income recognized 64 71 76
Interest income collected 93 74 80
Consumer and Other Portfolio Segment [Member] | Consumer [Member]      
Unpaid contractual principal balance with no related allowance 175 180 188
Impaired balance with no related allowance 175 179 188
Average recorded investment with no related allowance 193 186 186
Interest income recognized with no related allowance 9 5 9
Interest income collected with no related allowance 10 5 9
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 175 180 188
Impaired balance 175 179 188
Average recorded investment 193 186 186
Interest income recognized 9 5 9
Interest income collected 10 $ 5 $ 9
Consumer and Other Portfolio Segment [Member] | Other [Member]      
Unpaid contractual principal balance with no related allowance 0    
Impaired balance with no related allowance 0    
Average recorded investment with no related allowance 0    
Interest income recognized with no related allowance 0    
Interest income collected with no related allowance 0    
Unpaid contractual principal balance with an allowance 0    
Impaired balance with an allowance 0    
Related allowance 0    
Average recorded investment with an allowance 0    
Interest income recognized with an allowance 0    
Interest income collected with an allowance 0    
Unpaid contractual principal balance 0    
Impaired balance 0    
Average recorded investment 0    
Interest income recognized 0    
Interest income collected $ 0