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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, 2019 | Dec. 31, 2018
--- | --- | ---
With an allowance recorded: |  |
Allowance for Loan Losses Allocated | $ 2,301 | $ 4,722
With no related allowance recorded: |  |
Unpaid Principal Balance, Total | 24,431 | 23,707
Recorded Investment, Total | 20,755 | 17,918
Commercial, industrial, and agricultural |  |
With an allowance recorded: |  |
Unpaid Principal Balance | 2,657 | 3,053
Recorded Investment | 1,476 | 3,037
Allowance for Loan Losses Allocated | 673 | 158
With no related allowance recorded: |  |
Unpaid Principal Balance | 9,845 | 3,684
Recorded Investment | 9,695 | 2,874
Commercial mortgages |  |
With an allowance recorded: |  |
Unpaid Principal Balance | 6,541 | 10,799
Recorded Investment | 4,349 | 6,709
Allowance for Loan Losses Allocated | 1,594 | 4,454
With no related allowance recorded: |  |
Unpaid Principal Balance | 4,903 | 5,659
Recorded Investment | 4,770 | 4,786
Residential real estate |  |
With an allowance recorded: |  |
Unpaid Principal Balance | 485 | 502
Recorded Investment | 465 | 502
Allowance for Loan Losses Allocated | 34 | 100
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

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