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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, 2019	Sep. 30, 2020	Sep. 30, 2019
With no related allowance recorded:
Average Recorded Investment, Total	$ 27,723	$ 15,397	$ 26,774	$ 16,380
Interest Income Recognized, Total	158	123	566	383
Cash Basis Interest Recognized, Total	158	123	566	383
Commercial, industrial and agricultural
With an allowance recorded:
Average Recorded Investment	2,409	1,480	3,341	1,819
Interest Income Recognized	33	32	78	74
Cash Basis Interest Recognized	33	32	78	74
With no related allowance recorded:
Average Recorded Investment	5,623	3,977	6,392	3,676
Interest Income Recognized	51	42	142	128
Allowance for Loan Losses Allocated	51	42	142	128
Commercial mortgages
With an allowance recorded:
Average Recorded Investment	4,002	7,024	4,166	7,145
Interest Income Recognized	0	12	41	100
Cash Basis Interest Recognized	0	12	41	100
With no related allowance recorded:
Average Recorded Investment	14,758	2,435	12,178	3,250
Interest Income Recognized	59	29	283	62
Allowance for Loan Losses Allocated	59	29	283	62
Residential real estate
With an allowance recorded:
Average Recorded Investment	819	245	641	122
Interest Income Recognized	11	8	16	8
Cash Basis Interest Recognized	11	8	16	8
With no related allowance recorded:
Average Recorded Investment	112	236	56	368
Interest Income Recognized	4	0	6	11
Allowance for Loan Losses Allocated	$ 4	$ 0	$ 6	$ 11

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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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