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Allowance for Loan Losses and Impaired Loans (Impaired Loans) (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Recorded investment, with no related allowance [1] $ 4,541 $ 4,355
Unpaid principal balance, with no related allowance 4,541 4,355
Average recorded investment, with no related allowance 4,577 5,472
Interest income recognized, with no related allowance 6 50
Recorded investment, with allowance [1] 9,363 8,965
Unpaid principal balance, with allowance 9,660 9,263
Related allowance 615 556
Average recorded investment, with allowance 9,740 9,735
Interest income recognized, with allowance 117 451
Recorded investment, totals [1] 13,904 13,320
Unpaid principal balance, totals 14,201 13,618
Related allowance, totals 615 556
Average recorded investment, totals 14,317 15,207
Interest income recognized, totals 123 501
Land development & other land    
Financing Receivable, Impaired [Line Items]    
Recorded investment, with no related allowance [1] 388 581
Unpaid principal balance, with no related allowance 388 581
Average recorded investment, with no related allowance 389 840
Interest income recognized, with no related allowance   17
Recorded investment, with allowance [1] 425 193
Unpaid principal balance, with allowance 425 193
Related allowance 25 10
Average recorded investment, with allowance 429 201
Interest income recognized, with allowance 3 16
Recorded investment, totals [1] 813 774
Unpaid principal balance, totals 813 774
Related allowance, totals 25 10
Average recorded investment, totals 818 1,041
Interest income recognized, totals 3 33
Farmland    
Financing Receivable, Impaired [Line Items]    
Recorded investment, with no related allowance [1] 4,039 3,660
Unpaid principal balance, with no related allowance 4,039 3,660
Average recorded investment, with no related allowance 4,074 4,170
Interest income recognized, with no related allowance 6 18
Recorded investment, with allowance [1] 1,915 1,679
Unpaid principal balance, with allowance 1,915 1,679
Related allowance 83 73
Average recorded investment, with allowance 2,013 1,705
Interest income recognized, with allowance 23 84
Recorded investment, totals [1] 5,954 5,339
Unpaid principal balance, totals 5,954 5,339
Related allowance, totals 83 73
Average recorded investment, totals 6,087 5,875
Interest income recognized, totals 29 102
1-4 residential mortgage    
Financing Receivable, Impaired [Line Items]    
Average recorded investment, with no related allowance   347
Interest income recognized, with no related allowance   10
Recorded investment, with allowance [1] 5,922 5,964
Unpaid principal balance, with allowance 6,079 6,121
Related allowance 441 414
Average recorded investment, with allowance 6,094 6,375
Interest income recognized, with allowance 78 294
Recorded investment, totals [1] 5,922 5,964
Unpaid principal balance, totals 6,079 6,121
Related allowance, totals 441 414
Average recorded investment, totals 6,094 6,722
Interest income recognized, totals 78 304
Home equity and second mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded investment, with allowance [1] 173 174
Unpaid principal balance, with allowance 178 179
Related allowance 10 9
Average recorded investment, with allowance 178 254
Interest income recognized, with allowance 2 8
Recorded investment, totals [1] 173 174
Unpaid principal balance, totals 178 179
Related allowance, totals 10 9
Average recorded investment, totals 178 254
Interest income recognized, totals 2 8
Commercial Mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded investment, with no related allowance [1] 114 114
Unpaid principal balance, with no related allowance 114 114
Average recorded investment, with no related allowance 114 115
Interest income recognized, with no related allowance   4
Recorded investment, with allowance [1] 828 838
Unpaid principal balance, with allowance 963 974
Related allowance 50 44
Average recorded investment, with allowance 917 1,035
Interest income recognized, with allowance 9 39
Recorded investment, totals [1] 942 952
Unpaid principal balance, totals 1,077 1,088
Related allowance, totals 50 44
Average recorded investment, totals 1,031 1,150
Interest income recognized, totals 9 43
Commercial & agricultural    
Financing Receivable, Impaired [Line Items]    
Recorded investment, with allowance [1] 99 113
Unpaid principal balance, with allowance 99 113
Related allowance 6 6
Average recorded investment, with allowance 106 155
Interest income recognized, with allowance 2 9
Recorded investment, totals [1] 99 113
Unpaid principal balance, totals 99 113
Related allowance, totals 6 6
Average recorded investment, totals 106 155
Interest income recognized, totals 2 9
Consumer & Other    
Financing Receivable, Impaired [Line Items]    
Interest income recognized, with no related allowance   1
Recorded investment, with allowance [1] 1 4
Unpaid principal balance, with allowance 1 4
Average recorded investment, with allowance 3 10
Interest income recognized, with allowance   1
Recorded investment, totals [1] 1 4
Unpaid principal balance, totals 1 4
Average recorded investment, totals $ 3 10
Interest income recognized, totals   $ 2
[1] Recorded investment is the loan balance, net of any charge-offs