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Loans - Loans Individually Evaluated for Impairment Including Loans Modified in Troubled Debt Restructurings by Portfolio Segment (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
With an allowance recorded: |  |
Allowance for Loan Losses Allocated | $ 5,508 | $ 4,722
With no related allowance recorded: |  |
Unpaid Principal Balance, Total | 20,324 | 23,707
Recorded Investment, Total | 16,819 | 17,918
Commercial, industrial, and agricultural |  |
With an allowance recorded: |  |
Unpaid Principal Balance | 2,840 | 3,053
Recorded Investment | 1,278 | 3,037
Allowance for Loan Losses Allocated | 437 | 158
With no related allowance recorded: |  |
Unpaid Principal Balance | 4,556 | 3,684
Recorded Investment | 3,877 | 2,874
Commercial mortgages |  |
With an allowance recorded: |  |
Unpaid Principal Balance | 8,205 | 10,799
Recorded Investment | 7,824 | 6,709
Allowance for Loan Losses Allocated | 5,071 | 4,454
With no related allowance recorded: |  |
Unpaid Principal Balance | 4,225 | 5,659
Recorded Investment | 3,342 | 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 | 0 | 502
Recorded Investment | 0 | 502
Allowance for Loan Losses Allocated | 0 | 100
With no related allowance recorded: |  |
Unpaid Principal Balance | 498 | 0
Recorded Investment | $ 498 | $ 0

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