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Loans and ALLL (Summary of Defaulted TDRs) (Details) - loan | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | 0 | 0

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration