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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
With no related allowance recorded:
Average Recorded Investment, Total	$ 17,725	$ 20,715	$ 18,369
Interest Income Recognized, Total	599	915	660
Cash Basis Interest Recognized, Total	599	886	660
Commercial, industrial, and agricultural
With an allowance recorded:
Average Recorded Investment	1,750	2,745	1,513
Interest Income Recognized	90	254	97
Cash Basis Interest Recognized	90	249	97
With no related allowance recorded:
Average Recorded Investment	4,919	4,642	2,438
Interest Income Recognized	208	157	114
Cash Basis Interest Recognized	208	148	114
Commercial mortgages
With an allowance recorded:
Average Recorded Investment	6,586	8,456	11,944
Interest Income Recognized	119	338	327
Cash Basis Interest Recognized	119	326	327
With no related allowance recorded:
Average Recorded Investment	3,985	4,566	2,474
Interest Income Recognized	158	146	122
Cash Basis Interest Recognized	158	144	122
Residential real estate
With an allowance recorded:
Average Recorded Investment	191	304	0
Interest Income Recognized	13	20	0
Cash Basis Interest Recognized	13	19	0
With no related allowance recorded:
Average Recorded Investment	294	0	0
Interest Income Recognized	11	0	0
Cash Basis Interest Recognized	11	0	$ 0
Overdrafts
With an allowance recorded:
Average Recorded Investment	0	2
Interest Income Recognized	0	0
Cash Basis Interest Recognized	0	$ 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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