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Loans - Loans Individually Evaluated for Impairment (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
With an allowance recorded: |  |
Allowance for Loan Losses Allocated | $ 6,472 | $ 5,736
With no related allowance recorded: |  |
Unpaid Principal Balance, Total | 22,195 | 20,330
Recorded Investment, Total | 19,711 | 18,541
Commercial, Industrial, and Agricultural |  |
With an allowance recorded: |  |
Unpaid Principal Balance | 1,096 | 1,915
Recorded Investment | 1,096 | 1,915
Allowance for Loan Losses Allocated | 237 | 292
With no related allowance recorded: |  |
Unpaid Principal Balance | 5,918 | 5,264
Recorded Investment | 5,202 | 4,485
Commercial mortgages |  |
With an allowance recorded: |  |
Unpaid Principal Balance | 9,717 | 9,940
Recorded Investment | 8,991 | 9,731
Allowance for Loan Losses Allocated | 6,235 | 5,444
With no related allowance recorded: |  |
Unpaid Principal Balance | 5,464 | 3,211
Recorded Investment | 4,422 | 2,410
Residential Real Estate |  |
With an allowance recorded: |  |
Unpaid Principal Balance | 0 | 0
Recorded Investment | 0 | 0
Allowance for Loan Losses Allocated | 0 | 0
With no related allowance recorded: |  |
Unpaid Principal Balance | 0 | 0
Recorded Investment | $ 0 | $ 0

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