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Loans - Impaired Financing Receivables with Related and not Related Allowances (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
With no related allowance recorded: |  |
Average Recorded Investment, Total |  | $ 25,825
Interest Income Recognized, Total |  | 259
Cash Basis Interest Recognized, Total |  | 259
Commercial Industrial And Agricultural [Member] |  |
With an allowance recorded: |  |
Average Recorded Investment |  | 4,272
Interest Income Recognized |  | 17
Cash Basis Interest Recognized | $ 17 |
With no related allowance recorded: |  |
Average Recorded Investment |  | 7,161
Interest Income Recognized |  | 42
Cash Basis Interest Recognized |  | 42
Commercial Mortgages |  |
With an allowance recorded: |  |
Average Recorded Investment |  | 4,331
Interest Income Recognized |  | 37
Cash Basis Interest Recognized | 37 |
With no related allowance recorded: |  |
Average Recorded Investment |  | 9,598
Interest Income Recognized |  | 158
Cash Basis Interest Recognized |  | 158
Residential Real Estate [Member] |  |
With an allowance recorded: |  |
Average Recorded Investment |  | 463
Interest Income Recognized |  | 5
Cash Basis Interest Recognized | $ 5 |
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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