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Loans - Impaired Financing Receivables with Related and not Related Allowances (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
With no related allowance recorded:
Average Recorded Investment, Total	$ 16,633	$ 23,392	$ 17,058	$ 21,774
Interest Income Recognized, Total	129	155	286	254
Cash Basis Interest Recognized, Total	129	155	286	254
Commercial, industrial, and agricultural
With an allowance recorded:
Average Recorded Investment	1,273	3,838	1,861	3,197
Interest Income Recognized	27	21	65	43
Cash Basis Interest Recognized	27	21	65	43
With no related allowance recorded:
Average Recorded Investment	3,811	5,326	3,499	5,045
Interest Income Recognized	32	45	86	91
Cash Basis Interest Recognized	32	45	86	91
Commercial mortgages
With an allowance recorded:
Average Recorded Investment	7,807	8,738	7,441	9,069
Interest Income Recognized	46	56	86	74
Cash Basis Interest Recognized	46	56	86	74
With no related allowance recorded:
Average Recorded Investment	3,257	5,490	3,767	4,463
Interest Income Recognized	20	33	38	46
Cash Basis Interest Recognized	20	33	38	46
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	485	0	490	0
Interest Income Recognized	4	0	11	0
Cash Basis Interest Recognized	$ 4	$ 0	$ 11	$ 0

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Impaired Financing Receivable, Average Recorded Investment With An Allowance Recorded [Abstract]

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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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