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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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Impaired Financing Receivable, Unpaid Principal Balance With No Allowance Recorded [Abstract]

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
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