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Loans and Allowance for Credit Losses Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired loans with principal balances approximately in percentage | 97.00% |  | 83.00%
Unpaid principal balance, with no related allowance | $ 61,892 |  | $ 68,595
Excluded from TDRs | 3,600,000 | $ 1,000,000 |
Minimum |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Minimum balance of loans evaluated individually for impairment | 1,000 |  | $ 1,000
Impaired loans balances, real estate as collateral | $ 1,000 |  |

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- Definition Financing Receivable, Troubled Debt Restructuring, Postmodification, Excluded + References No definition available. + Details
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- Definition Represents the maximum balance of impaired loans that are pooled and evaluated collectively for impairment, rather than individually evaluated for impairment. + References No definition available. + Details
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- Definition Represents the minimum principal balance threshold for disclosing impaired loans primarily secured by real estate that were measured at estimated fair value using certified third party appraisals updated in the previous 12 months. + References No definition available. + Details
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- Definition Percentage of impaired loans primarily collateralized by real estate with principal balances greater than $1 million that were measured at estimated fair value using certified third party appraisals that had been updated in the previous 12 months. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables for which there is no 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 (a)(4) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 + Details
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