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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
With no related allowance recorded:
Average Recorded Investment, Total	$ 20,715	$ 18,369	$ 15,867
Interest Income Recognized, Total	915	660	8
Cash Basis Interest Recognized, Total	886	660	8
Commercial, industrial, and agricultural
With an allowance recorded:
Average Recorded Investment	2,745	1,513	2,616
Interest Income Recognized	254	97	2
Cash Basis Interest Recognized	249	97	2
With no related allowance recorded:
Average Recorded Investment	4,642	2,438	2,290
Interest Income Recognized	157	114	0
Cash Basis Interest Recognized	148	114	0
Commercial mortgages
With an allowance recorded:
Average Recorded Investment	8,456	11,944	8,138
Interest Income Recognized	338	327	0
Cash Basis Interest Recognized	326	327	0
With no related allowance recorded:
Average Recorded Investment	4,566	2,474	2,773
Interest Income Recognized	146	122	0
Cash Basis Interest Recognized	144	122	0
Residential real estate
With an allowance recorded:
Average Recorded Investment	304	0	50
Interest Income Recognized	20	0	6
Cash Basis Interest Recognized	19	0	6
With no related allowance recorded:
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Cash Basis Interest Recognized	0	$ 0	$ 0
Overdrafts
With an allowance recorded:
Average Recorded Investment	2
Interest Income Recognized	0
Cash Basis Interest Recognized	0
With no related allowance recorded:
Average Recorded Investment	0
Interest Income Recognized	0
Cash Basis Interest Recognized	$ 0

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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-Publisher FASB
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-Section 50
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