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Loans and Allowance for Credit Losses on Loans - Troubled Debt Restructurings by Class (Details) | 12 Months Ended
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Dec. 31, 2020 contract | Dec. 31, 2020 USD ($) | Dec. 31, 2020 loan | Dec. 31, 2019 USD ($) contract
Troubled Debt Restructurings by Class |  |  |  |
Number of loans modified as troubled debt restructurings during the period | 15 |  | 15 | 3
Pre-modification Outstanding Recorded Investment |  | $ 630,000 |  | $ 591,000
Post-modification Outstanding Recorded Investment |  | 630,000 |  | $ 591,000
Commercial |  |  |  |
Troubled Debt Restructurings by Class |  |  |  |
Number of loans modified as troubled debt restructurings during the period | contract | 15 |  |  | 3
Pre-modification Outstanding Recorded Investment |  | 630,000 |  | $ 591,000
Post-modification Outstanding Recorded Investment |  | $ 630,000 |  | $ 591,000

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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- Definition Amount, before troubled debt restructuring, of financing receivable to be modified. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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