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Note 3 - Loans - Impaired Loan Data (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Unpaid contractual principal balance with no related allowance $ 15,967 $ 18,228 $ 19,781
Impaired balance with no related allowance 15,857 17,410 19,295
Average recorded investment with no related allowance 17,218 20,119 19,502
Interest income recognized with no related allowance 348 411 882
Interest income collected with no related allowance 356 430 901
Unpaid contractual principal balance with an allowance 5,932 7,665 6,702
Impaired balance with an allowance 5,932 7,657 6,702
Related allowance 1,474 1,567 1,827
Average recorded investment with an allowance 6,287 7,919 7,698
Interest income recognized with an allowance 121 146 278
Interest income collected with an allowance 114 149 299
Unpaid contractual principal balance 21,899 25,893 26,483
Impaired balance 21,789 25,067 25,997
Average recorded investment 23,505 28,038 27,200
Interest income recognized 469 557 1,160
Interest income collected 470 579 1,200
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member]      
Unpaid contractual principal balance with no related allowance 367 608 599
Impaired balance with no related allowance 367 608 599
Average recorded investment with no related allowance 520 639 634
Interest income recognized with no related allowance 5 11 33
Interest income collected with no related allowance 5 15 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 367 608 599
Impaired balance 367 608 599
Average recorded investment 520 639 634
Interest income recognized 5 11 33
Interest income collected 5 15 34
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member]      
Unpaid contractual principal balance with no related allowance 311 370 485
Impaired balance with no related allowance 290 349 398
Average recorded investment with no related allowance 360 254 297
Interest income recognized with no related allowance 9 11 11
Interest income collected with no related allowance 12 13 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 311 370 485
Impaired balance 290 349 398
Average recorded investment 360 254 297
Interest income recognized 9 11 11
Interest income collected 12 13 19
Real Estate Portfolio Segment [Member] | Commercial [Member]      
Unpaid contractual principal balance with no related allowance 10,201 10,454 12,637
Impaired balance with no related allowance 10,201 10,454 12,637
Average recorded investment with no related allowance 11,092 13,543 12,808
Interest income recognized with no related allowance 235 226 560
Interest income collected with no related allowance 236 222 550
Unpaid contractual principal balance with an allowance 5,047 7,169 5,729
Impaired balance with an allowance 5,047 7,169 5,729
Related allowance 1,371 1,517 1,713
Average recorded investment with an allowance 5,371 6,714 6,599
Interest income recognized with an allowance 106 135 229
Interest income collected with an allowance 99 134 237
Unpaid contractual principal balance 15,248 17,623 18,366
Impaired balance 15,248 17,623 18,366
Average recorded investment 16,463 20,257 19,407
Interest income recognized 341 361 789
Interest income collected 335 356 787
Real Estate Portfolio Segment [Member] | Commercial Construction [Member]      
Unpaid contractual principal balance with no related allowance 16 102 54
Impaired balance with no related allowance 16 102 54
Average recorded investment with no related allowance 38 159 141
Interest income recognized with no related allowance 1 1 3
Interest income collected with no related allowance 1 1 4
Unpaid contractual principal balance with an allowance 482 71 493
Impaired balance with an allowance 482 71 493
Related allowance 54 4 66
Average recorded investment with an allowance 487 72 241
Interest income recognized with an allowance 2 2 23
Interest income collected with an allowance 2 2 33
Unpaid contractual principal balance 498 173 547
Impaired balance 498 173 547
Average recorded investment 525 231 382
Interest income recognized 3 3 26
Interest income collected 3 3 37
Real Estate Portfolio Segment [Member] | Residential Construction [Member]      
Unpaid contractual principal balance with no related allowance 0 199 0
Impaired balance with no related allowance 0 199 0
Average recorded investment with no related allowance 0 66 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
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 0 199 0
Impaired balance 0 199 0
Average recorded investment 0 66 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 3,892 5,667 4,978
Impaired balance with no related allowance 3,805 4,871 4,580
Average recorded investment with no related allowance 4,113 4,511 4,566
Interest income recognized with no related allowance 87 98 212
Interest income collected with no related allowance 89 115 227
Unpaid contractual principal balance with an allowance 36 49 109
Impaired balance with an allowance 36 41 109
Related allowance 21 20 27
Average recorded investment with an allowance 60 755 482
Interest income recognized with an allowance 1 (2) 4
Interest income collected with an allowance 1 2 7
Unpaid contractual principal balance 3,928 5,716 5,087
Impaired balance 3,841 4,912 4,689
Average recorded investment 4,173 5,266 5,048
Interest income recognized 88 96 216
Interest income collected 90 117 234
Real Estate Portfolio Segment [Member] | Farmland [Member]      
Unpaid contractual principal balance with no related allowance 980 679 840
Impaired balance with no related allowance 978 678 839
Average recorded investment with no related allowance 896 759 791
Interest income recognized with no related allowance 5 56 54
Interest income collected with no related allowance 7 56 58
Unpaid contractual principal balance with an allowance 367 376 371
Impaired balance with an allowance 367 376 371
Related allowance 28 26 21
Average recorded investment with an allowance 369 378 376
Interest income recognized with an allowance 12 11 22
Interest income collected with an allowance 12 11 22
Unpaid contractual principal balance 1,347 1,055 1,211
Impaired balance 1,345 1,054 1,210
Average recorded investment 1,265 1,137 1,167
Interest income recognized 17 67 76
Interest income collected 19 67 80
Consumer and Other Portfolio Segment [Member] | Consumer [Member]      
Unpaid contractual principal balance with no related allowance 200 149 188
Impaired balance with no related allowance 200 149 188
Average recorded investment with no related allowance 199 188 186
Interest income recognized with no related allowance 6 3 9
Interest income collected with no related allowance 6 3 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 200 149 188
Impaired balance 200 149 188
Average recorded investment 199 188 186
Interest income recognized 6 3 9
Interest income collected 6 $ 3 $ 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