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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