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Allowance for Loan Losses - Aging Analysis of Past Due Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 4,162 $ 11,805
Current 1,643,939 1,549,212
Total Loans 1,648,640 1,561,941
Past Due 90 Days and Accruing 17  
30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,634 8,328
60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 296 1,449
90 Days or Greater [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,232 2,028
Receivables Acquired with Deteriorated Credit Quality [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Purchased Credit-Impaired Loans 539 924
Commercial and Agriculture [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 686 317
Current 196,147 176,743
Total Loans 196,833 177,101
Commercial and Agriculture [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 531 225
Commercial and Agriculture [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 56  
Commercial and Agriculture [Member] | 90 Days or Greater [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 99 92
Commercial and Agriculture [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Purchased Credit-Impaired Loans   41
Commercial Real Estate Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 980 1,524
Current 225,521 208,597
Total Loans 226,501 210,121
Commercial Real Estate Owner Occupied [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 206 547
Commercial Real Estate Owner Occupied [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   413
Commercial Real Estate Owner Occupied [Member] | 90 Days or Greater [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 774 564
Commercial Real Estate Non Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 257 950
Current 558,547 522,648
Total Loans 558,804 523,598
Commercial Real Estate Non Owner Occupied [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 248 288
Commercial Real Estate Non Owner Occupied [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   290
Commercial Real Estate Non Owner Occupied [Member] | 90 Days or Greater [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 9 372
Residential Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,908 8,601
Current 463,008 448,366
Total Loans 465,455 457,850
Residential Real Estate [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 367 7,118
Residential Real Estate [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 234 677
Residential Real Estate [Member] | 90 Days or Greater [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,307 806
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Purchased Credit-Impaired Loans 539 883
Real Estate Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 84 39
Current 148,934 135,156
Total Loans 149,018 135,195
Real Estate Construction [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 84  
Real Estate Construction [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   12
Real Estate Construction [Member] | 90 Days or Greater [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   27
Farm Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 131 191
Current 36,155 38,322
Total Loans 36,286 38,513
Farm Real Estate [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 122 33
Farm Real Estate [Member] | 90 Days or Greater [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 9 158
Consumer and Other [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 116 183
Current 15,627 19,380
Total Loans 15,743 19,563
Past Due 90 Days and Accruing 17  
Consumer and Other [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 76 117
Consumer and Other [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 6 57
Consumer and Other [Member] | 90 Days or Greater [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 34 $ 9