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Loans - Loans Individually Evaluated for Impairment Including Loans Modified in Troubled Debt Restructurings by Portfolio Segment (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
With an allowance recorded: |  |
Allowance for Loan Losses Allocated | $ 4,722 | $ 5,736
With no related allowance recorded: |  |
Unpaid Principal Balance, Total | 23,707 | 20,330
Recorded Investment, Total | 17,918 | 18,541
Commercial, industrial, and agricultural |  |
With an allowance recorded: |  |
Unpaid Principal Balance | 3,053 | 1,915
Recorded Investment | 3,037 | 1,915
Allowance for Loan Losses Allocated | 158 | 292
With no related allowance recorded: |  |
Unpaid Principal Balance | 3,684 | 5,264
Recorded Investment | 2,874 | 4,485
Commercial mortgages |  |
With an allowance recorded: |  |
Unpaid Principal Balance | 10,799 | 9,940
Recorded Investment | 6,709 | 9,731
Allowance for Loan Losses Allocated | 4,454 | 5,444
With no related allowance recorded: |  |
Unpaid Principal Balance | 5,659 | 3,211
Recorded Investment | 4,786 | 2,410
Residential real estate |  |
With an allowance recorded: |  |
Unpaid Principal Balance | 502 | 0
Recorded Investment | 502 | 0
Allowance for Loan Losses Allocated | 100 | 0
With no related allowance recorded: |  |
Unpaid Principal Balance | 0 | 0
Recorded Investment | 0 | $ 0
Overdrafts |  |
With an allowance recorded: |  |
Unpaid Principal Balance | 10 |
Recorded Investment | 10 |
Allowance for Loan Losses Allocated | 10 |
With no related allowance recorded: |  |
Unpaid Principal Balance | 0 |
Recorded Investment | $ 0 |

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