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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, 2018	Dec. 31, 2017
With an allowance recorded:
Allowance for Loan Losses Allocated	$ 4,722	$ 5,736
With no related allowance recorded:
Unpaid Principal Balance, Total	23,707	20,330
Recorded Investment, Total	17,918	18,541
Commercial, industrial, and agricultural
With an allowance recorded:
Unpaid Principal Balance	3,053	1,915
Recorded Investment	3,037	1,915
Allowance for Loan Losses Allocated	158	292
With no related allowance recorded:
Unpaid Principal Balance	3,684	5,264
Recorded Investment	2,874	4,485
Commercial mortgages
With an allowance recorded:
Unpaid Principal Balance	10,799	9,940
Recorded Investment	6,709	9,731
Allowance for Loan Losses Allocated	4,454	5,444
With no related allowance recorded:
Unpaid Principal Balance	5,659	3,211
Recorded Investment	4,786	2,410
Residential real estate
With an allowance recorded:
Unpaid Principal Balance	502	0
Recorded Investment	502	0
Allowance for Loan Losses Allocated	100	0
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
With no related allowance recorded:
Unpaid Principal Balance	0
Recorded Investment	$ 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
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