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Loans - Impaired Financing Receivables with Related and not Related Allowances (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
With no related allowance recorded:
Average Recorded Investment, Total	$ 27,723	$ 26,774
Interest Income Recognized, Total	158	566
Cash Basis Interest Recognized, Total	158	566
Commercial, industrial and agricultural
With an allowance recorded:
Average Recorded Investment	2,409	3,341
Interest Income Recognized	33	78
Cash Basis Interest Recognized	33	78
With no related allowance recorded:
Average Recorded Investment	5,623	6,392
Interest Income Recognized	51	142
Cash Basis Interest Recognized	51	142
Commercial mortgages
With an allowance recorded:
Average Recorded Investment	4,002	4,166
Interest Income Recognized	0	41
Cash Basis Interest Recognized	0	41
With no related allowance recorded:
Average Recorded Investment	14,758	12,178
Interest Income Recognized	59	283
Cash Basis Interest Recognized	59	283
Residential real estate
With an allowance recorded:
Average Recorded Investment	819	641
Interest Income Recognized	11	16
Cash Basis Interest Recognized	11	16
With no related allowance recorded:
Average Recorded Investment	112	56
Interest Income Recognized	4	6
Cash Basis Interest Recognized	$ 4	$ 6

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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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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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