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Loans - Loans Individually Evaluated for Impairment (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
With an allowance recorded: |  |
Allowance for Loan Losses Allocated | $ 7,286 | $ 5,736
With no related allowance recorded: |  |
Unpaid Principal Balance, Total | 29,324 | 20,330
Recorded Investment, Total | 26,734 | 18,541
Commercial, Industrial, and Agricultural |  |
With an allowance recorded: |  |
Unpaid Principal Balance | 5,828 | 1,915
Recorded Investment | 5,824 | 1,915
Allowance for Loan Losses Allocated | 1,019 | 292
With no related allowance recorded: |  |
Unpaid Principal Balance | 6,853 | 5,264
Recorded Investment | 5,935 | 4,485
Commercial mortgages |  |
With an allowance recorded: |  |
Unpaid Principal Balance | 9,753 | 9,940
Recorded Investment | 9,091 | 9,731
Allowance for Loan Losses Allocated | 6,267 | 5,444
With no related allowance recorded: |  |
Unpaid Principal Balance | 6,890 | 3,211
Recorded Investment | 5,884 | 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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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
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