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Loans and Allowance for Loan Losses - Additional Information (Details) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) Contract | Dec. 31, 2018 USD ($) Contract | Aug. 31, 2018 USD ($)
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items] |  |  |
Loans Pledged as Collateral | $ 29,600 | $ 27,000 |
Loans and Leases Receivable, Related Parties, Ending Balance | 900 | 800 |
Loans and Leases Receivable, Related Parties, Additions | 100 | 500 |
Loans and Leases Receivable, Related Parties, Proceeds | 8 | 200 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance, Total |  |  | $ 2,900
Purchased credit impaired loans |  |  | $ 2,831
Certain Loans Acquired in Transfer, Accretable Yield | 0 | 0 |
Loans | 555,338 | 525,870 |
Non-accruing loans | 1,468 | 2,759 |
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest | 1,500 | 2,800 |
Financing Receivable, Troubled Debt Restructuring | 100 | 200 |
Impaired loans with no related allowance recorded, carrying amount | 1,493 | 708 |
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans | 30 | 44 |
Interest Income Recorded | 13 | 27 |
Financing Receivable, Restructuring Recorded Investment With Nonaccrual Status | 18 | 65 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition | $ 0 | $ 0 |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Contract | 0 | 0 |
Loans, allowance for loan losses | $ 5,585 | $ 5,055 |
Restructured Loan Modified through Extended Maturity and Payment Schedule Modification [Member] |  |  |
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items] |  |  |
Financing Receivable, Restructuring Recorded Investment With Nonaccrual Status | 500 |  |
Loans, allowance for loan losses | 1 | 2 |
Minimum [Member] |  |  |
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items] |  |  |
Loans Modified in a Troubled Debt Restructuring, Individually Evaluated for Impairment, Principal Balance, Threshold | 500 |  |
Minimum [Member] | ALC [Member] |  |  |
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items] |  |  |
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest |  | 50 |
Financial Asset Acquired With Credit Deterioration [Member] |  |  |
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items] |  |  |
Non-accruing loans | 200 | 500 |
Impaired loans with no related allowance recorded, carrying amount | 200 | 500 |
Financial Asset Acquired With Credit Deterioration [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items] |  |  |
Loans | 200 | 300 |
Financial Asset Acquired With Credit Deterioration [Member] | Substandard [Member] |  |  |
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items] |  |  |
Loans | $ 200 | $ 500 |
Real Estate [Member] |  |  |
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items] |  |  |
Percentage of Loan Portfolio | 62.90% | 63.20% |

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- Definition The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 + Details
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- Definition The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 + Details
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