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Loans - Impaired Financing Receivables with Related and not Related Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
With no related allowance recorded:
Average Recorded Investment, Total	$ 17,725	$ 20,715
Interest Income Recognized, Total	599	915
Cash Basis Interest Recognized, Total	599	886
Commercial, industrial, and agricultural
With an allowance recorded:
Average Recorded Investment	1,750	2,745
Interest Income Recognized	90	254
Cash Basis Interest Recognized	90	249
With no related allowance recorded:
Average Recorded Investment	4,919	4,642
Interest Income Recognized	208	157
Cash Basis Interest Recognized	208	148
Commercial mortgages
With an allowance recorded:
Average Recorded Investment	6,586	8,456
Interest Income Recognized	119	338
Cash Basis Interest Recognized	119	326
With no related allowance recorded:
Average Recorded Investment	3,985	4,566
Interest Income Recognized	158	146
Cash Basis Interest Recognized	158	144
Residential Real Estate
With an allowance recorded:
Average Recorded Investment	191	304
Interest Income Recognized	13	20
Cash Basis Interest Recognized	13	19
With no related allowance recorded:
Average Recorded Investment	294	0
Interest Income Recognized	11	0
Cash Basis Interest Recognized	11	0
Overdrafts
With an allowance recorded:
Average Recorded Investment	0	2
Interest Income Recognized	0	0
Cash Basis Interest Recognized	0	$ 0
With no related allowance recorded:
Average Recorded Investment	0
Interest Income Recognized	0
Cash Basis Interest Recognized	$ 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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