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Note 3 - Loans - Impaired Loan Data (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Impaired balance with an allowance $ 7,657 $ 10,009 $ 10,387
Average recorded investment with an allowance 7,919 9,781 9,871
Interest income recognized with an allowance 146 140 289
Interest income collected with an allowance 149 138 291
Unpaid contractual principal balance 25,893 33,950 31,292
Impaired balance 25,067 32,833 30,661
Related allowance 1,567 3,381 3,435
Average recorded investment 28,038 30,880 31,375
Interest income recognized 557 426 1,001
Interest income collected 579 559 1,126
Unpaid contractual principal balance with no related allowance 18,228 23,919 20,807
Impaired balance with no related allowance 17,410 22,824 20,274
Average recorded investment with no related allowance 20,119 21,099 21,504
Interest income recognized with no related allowance 411 286 712
Interest income collected with no related allowance 430 421 835
Unpaid contractual principal balance with an allowance 7,665 10,031 10,485
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member]      
Impaired balance with an allowance
Average recorded investment with an allowance 50 30
Interest income recognized with an allowance
Interest income collected with an allowance
Unpaid contractual principal balance 608 460 635
Impaired balance 608 460 635
Related allowance
Average recorded investment 639 522 569
Interest income recognized 11 4 24
Interest income collected 15 5 27
Unpaid contractual principal balance with no related allowance 608 460 635
Impaired balance with no related allowance 608 460 635
Average recorded investment with no related allowance 639 472 539
Interest income recognized with no related allowance 11 4 24
Interest income collected with no related allowance 15 5 27
Unpaid contractual principal balance with an allowance
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member]      
Impaired balance with an 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 370 213 229
Impaired balance 349 192 209
Related allowance 0 0 0
Average recorded investment 254 188 210
Interest income recognized 11 9 9
Interest income collected 13 13 12
Unpaid contractual principal balance with no related allowance 370 213 229
Impaired balance with no related allowance 349 192 209
Average recorded investment with no related allowance 254 188 210
Interest income recognized with no related allowance 11 9 9
Interest income collected with no related allowance 13 13 12
Unpaid contractual principal balance with an allowance 0 0 0
Real Estate Portfolio Segment [Member] | Commercial [Member]      
Impaired balance with an allowance 7,169 8,695 8,467
Average recorded investment with an allowance 6,714 8,305 8,340
Interest income recognized with an allowance 135 127 239
Interest income collected with an allowance 134 124 236
Unpaid contractual principal balance 17,623 25,092 22,915
Impaired balance 17,623 24,310 22,743
Related allowance 1,517 2,886 3,022
Average recorded investment 20,257 21,882 22,615
Interest income recognized 361 398 806
Interest income collected 356 394 796
Unpaid contractual principal balance with no related allowance 10,454 16,383 14,358
Impaired balance with no related allowance 10,454 15,615 14,276
Average recorded investment with no related allowance 13,543 13,577 14,275
Interest income recognized with no related allowance 226 271 567
Interest income collected with no related allowance 222 270 560
Unpaid contractual principal balance with an allowance 7,169 8,709 8,557
Real Estate Portfolio Segment [Member] | Commercial Construction [Member]      
Impaired balance with an allowance 71 74 72
Average recorded investment with an allowance 72 75 74
Interest income recognized with an allowance 2 1
Interest income collected with an allowance 2 2
Unpaid contractual principal balance 173 527 263
Impaired balance 173 502 263
Related allowance 4 22 21
Average recorded investment 231 1,005 772
Interest income recognized 3 8 8
Interest income collected 3 7 9
Unpaid contractual principal balance with no related allowance 102 453 191
Impaired balance with no related allowance 102 428 191
Average recorded investment with no related allowance 159 930 698
Interest income recognized with no related allowance 1 8 7
Interest income collected with no related allowance 1 7 7
Unpaid contractual principal balance with an allowance 71 74 72
Real Estate Portfolio Segment [Member] | Residential Construction [Member]      
Impaired balance with an allowance  
Average recorded investment with an allowance  
Interest income recognized with an allowance  
Interest income collected with an allowance  
Unpaid contractual principal balance 199  
Impaired balance 199  
Related allowance  
Average recorded investment 66  
Interest income recognized 5  
Interest income collected 5  
Unpaid contractual principal balance with no related allowance 199  
Impaired balance with no related allowance 199  
Average recorded investment with no related allowance 66  
Interest income recognized with no related allowance 5  
Interest income collected with no related allowance 5  
Unpaid contractual principal balance with an allowance  
Real Estate Portfolio Segment [Member] | Residential [Member]      
Impaired balance with an allowance 41 856 1,468
Average recorded investment with an allowance 755 965 1,043
Interest income recognized with an allowance (2) 3 28
Interest income collected with an allowance 2 3 32
Unpaid contractual principal balance 5,716 6,091 5,737
Impaired balance 4,912 5,812 5,420
Related allowance 20 440 363
Average recorded investment 5,266 5,571 5,596
Interest income recognized 96 (4) 101
Interest income collected 117 122 223
Unpaid contractual principal balance with no related allowance 5,667 5,227 4,261
Impaired balance with no related allowance 4,871 4,956 3,952
Average recorded investment with no related allowance 4,511 4,606 4,553
Interest income recognized with no related allowance 98 (7) 73
Interest income collected with no related allowance 115 119 191
Unpaid contractual principal balance with an allowance 49 864 1,476
Real Estate Portfolio Segment [Member] | Farmland [Member]      
Impaired balance with an allowance 376 384 380
Average recorded investment with an allowance 378 386 384
Interest income recognized with an allowance 11 10 21
Interest income collected with an allowance 11 11 21
Unpaid contractual principal balance 1,055 1,319 1,301
Impaired balance 1,054 1,317 1,179
Related allowance 26 33 29
Average recorded investment 1,137 1,507 1,400
Interest income recognized 67 7 43
Interest income collected 67 12 47
Unpaid contractual principal balance with no related allowance 679 935 921
Impaired balance with no related allowance 678 933 799
Average recorded investment with no related allowance 759 1,121 1,016
Interest income recognized with no related allowance 56 (3) 22
Interest income collected with no related allowance 56 1 26
Unpaid contractual principal balance with an allowance 376 384 380
Consumer and Other Portfolio Segment [Member] | Consumer [Member]      
Impaired balance with an 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 149 248 212
Impaired balance 149 240 212
Related allowance 0 0 0
Average recorded investment 188 205 213
Interest income recognized 3 4 10
Interest income collected 3 6 12
Unpaid contractual principal balance with no related allowance 149 248 212
Impaired balance with no related allowance 149 240 212
Average recorded investment with no related allowance 188 205 213
Interest income recognized with no related allowance 3 4 10
Interest income collected with no related allowance 3 6 12
Unpaid contractual principal balance with an allowance 0 0 $ 0
Consumer and Other Portfolio Segment [Member] | Other [Member]      
Impaired balance with an allowance  
Average recorded investment with an allowance  
Interest income recognized with an allowance  
Interest income collected with an allowance  
Unpaid contractual principal balance  
Impaired balance  
Related allowance  
Average recorded investment  
Interest income recognized  
Interest income collected  
Unpaid contractual principal balance with no related allowance  
Impaired balance with no related allowance  
Average recorded investment with no related allowance  
Interest income recognized with no related allowance  
Interest income collected with no related allowance  
Unpaid contractual principal balance with an allowance