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Loans - Loans Individually Evaluated for Impairment Including Loans Modified in Troubled Debt Restructurings by Portfolio Segment (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
With an allowance recorded: |  |
Allowance for Loan Losses Allocated | $ 3,409 | $ 4,722
With no related allowance recorded: |  |
Unpaid Principal Balance, Total | 18,246 | 23,707
Recorded Investment, Total | 14,344 | 17,918
Commercial, industrial, and agricultural |  |
With an allowance recorded: |  |
Unpaid Principal Balance | 3,021 | 3,053
Recorded Investment | 1,691 | 3,037
Allowance for Loan Losses Allocated | 802 | 158
With no related allowance recorded: |  |
Unpaid Principal Balance | 5,258 | 3,684
Recorded Investment | 4,208 | 2,874
Commercial mortgages |  |
With an allowance recorded: |  |
Unpaid Principal Balance | 8,055 | 10,799
Recorded Investment | 6,258 | 6,709
Allowance for Loan Losses Allocated | 2,578 | 4,454
With no related allowance recorded: |  |
Unpaid Principal Balance | 1,423 | 5,659
Recorded Investment | 1,698 | 4,786
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
Residential Real Estate |  |
With an allowance recorded: |  |
Unpaid Principal Balance | 489 | 502
Recorded Investment | 489 | 502
Allowance for Loan Losses Allocated | 29 | 100
With no related allowance recorded: |  |
Unpaid Principal Balance | 0 | 0
Recorded Investment | $ 0 | $ 0

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