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Loans - Impaired Financing Receivables with Related Allowances (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
With no related allowance recorded:
Average Recorded Investment, Total	$ 23,392	$ 18,183	$ 21,774	$ 18,382
Interest Income Recognized, Total	155	190	254	369
Cash Basis Interest Recognized, Total	155	190	254	369
Commercial, Industrial, and Agricultural
With an allowance recorded:
Average Recorded Investment	3,838	1,398	3,197	1,480
Interest Income Recognized	21	18	43	36
Cash Basis Interest Recognized	21	18	43	36
With no related allowance recorded:
Average Recorded Investment	5,326	1,833	5,045	1,812
Interest Income Recognized	45	34	91	50
Cash Basis Interest Recognized	45	34	91	50
Commercial mortgages
With an allowance recorded:
Average Recorded Investment	8,738	12,505	9,069	13,459
Interest Income Recognized	56	71	74	216
Cash Basis Interest Recognized	56	71	74	216
With no related allowance recorded:
Average Recorded Investment	5,490	2,447	4,463	1,631
Interest Income Recognized	33	67	46	67
Cash Basis Interest Recognized	33	67	46	67
Residential Real Estate
With an allowance recorded:
Average Recorded Investment	0	0	0	0
Interest Income Recognized	0	0	0	0
Cash Basis Interest Recognized	0	0	0	0
With no related allowance recorded:
Average Recorded Investment	0	0	0	0
Interest Income Recognized	0	0	0	0
Cash Basis Interest Recognized	$ 0	$ 0	$ 0	$ 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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