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Allowance for Loan Losses - Present impaired loans by portfolio segment (Details) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded Investment | $ 841,000 | $ 824,000
Related Allowance | 8,000 | 8,000
Unpaid Principal Balance | 863,000 | 846,000
Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded Investment | 833,000 | 816,000
Unpaid Principal Balance | 833,000 | 816,000
Commercial loans secured by non-owner occupied real estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded Investment | 8,000 | 8,000
Unpaid Principal Balance | 30,000 | 30,000
Impaired Loans with Specific Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded Investment | 841,000 | 824,000
Related Allowance | 87,000 | 92,000
Impaired Loans with Specific Allowance [Member] | Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded Investment | 833,000 | 816,000
Related Allowance | 79,000 | 84,000
Impaired Loans with Specific Allowance [Member] | Commercial loans secured by non-owner occupied real estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded Investment | 8,000 | 8,000
Related Allowance | 8,000 | 8,000
Impaired Loans With No Specific Allowance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded Investment | 0 | 0
Impaired Loans With No Specific Allowance [Member] | Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded Investment | 0 | 0
Impaired Loans With No Specific Allowance [Member] | Commercial loans secured by non-owner occupied real estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded Investment | $ 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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- Definition 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 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953550-111524 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + 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)(3) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524 + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without 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=118936363&loc=d3e5212-111524 + Details
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