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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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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524 + Details
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