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Loans - Loans Individually Evaluated for Impairment Including Loans Modified in Troubled Debt Restructurings by Portfolio Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
With an allowance recorded:
Allowance for Loan Losses Allocated	$ 2,798	$ 2,301
With no related allowance recorded:
Unpaid Principal Balance, Total	30,764	24,431
Recorded Investment, Total	26,536	20,755
Commercial, industrial and agricultural
With an allowance recorded:
Unpaid Principal Balance	2,847	2,657
Recorded Investment	2,767	1,476
Allowance for Loan Losses Allocated	1,498	673
With no related allowance recorded:
Unpaid Principal Balance	4,177	9,845
Recorded Investment	3,979	9,695
Commercial mortgages
With an allowance recorded:
Unpaid Principal Balance	5,166	6,541
Recorded Investment	3,673	4,349
Allowance for Loan Losses Allocated	1,191	1,594
With no related allowance recorded:
Unpaid Principal Balance	17,262	4,903
Recorded Investment	14,831	4,770
Residential Real Estate
With an allowance recorded:
Unpaid Principal Balance	1,197	485
Recorded Investment	1,177	465
Allowance for Loan Losses Allocated	109	34
With no related allowance recorded:
Unpaid Principal Balance	115	0
Recorded Investment	$ 109	$ 0

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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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