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Loans - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Classification of Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | $ 737 | $ 1,114
Current | 845,637 | 821,910
Loans after net deferred loan fees and costs | 846,374 | 823,024
Recorded Investment > 90 Days and Accruing | 0 | 0
30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 427 | 599
60 to 89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 48 | 256
Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 262 | 259
Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 620 | 890
Current | 79,612 | 82,310
Loans after net deferred loan fees and costs | 80,232 | 83,200
Consumer Real Estate [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 342 | 565
Consumer Real Estate [Member] | 60 to 89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 24 | 212
Consumer Real Estate [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 254 | 113
Agricultural Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due |  | 101
Current | 68,588 | 63,943
Loans after net deferred loan fees and costs | 68,588 | 64,044
Agricultural Real Estate [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due |  | 101
Agricultural [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current | 108,616 | 95,238
Loans after net deferred loan fees and costs | 108,616 | 95,238
Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due |  | 38
Current | 419,131 | 409,915
Loans after net deferred loan fees and costs | 419,131 | 409,953
Commercial Real Estate [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due |  | 38
Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due |  | 42
Current | 127,752 | 132,745
Loans after net deferred loan fees and costs | 127,752 | 132,787
Commercial and Industrial [Member] | 60 to 89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due |  | 42
Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 117 | 43
Current | 41,938 | 37,759
Loans after net deferred loan fees and costs | 42,055 | 37,802
Consumer [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 85 | 34
Consumer [Member] | 60 to 89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 24 | 2
Consumer [Member] | Greater Than 90 Days [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | $ 8 | $ 7

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