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Summary of Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) store | Dec. 31, 2016 USD ($)
Significant Accounting Policies [Line Items] |  |
Number of full-service banking offices | store | 5 |
Interest-bearing deposits in other financial institutions | $ 100 | $ 100
Minimum balance of loans individually evaluated for impairment | 250 |
Total original investment into joint ventures | 325 | 325
Incentive payment recognized as income | $ 20 | 100
Tax benefit greater than being realized on examination | 50.00% |
FRB regulatory reserve requirement | $ 718 | 267
Collateral pledged to secure advances | 85,091 | 61,616
Cash [Member] |  |
Significant Accounting Policies [Line Items] |  |
Collateral pledged to secure advances | $ 3,300 | 3,300
Minimum [Member] | Buildings and related components [Member] |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful life | 3 years |
Minimum [Member] | Furniture, fixtures and equipment [Member] |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful life | 2 years |
Maximum [Member] |  |
Significant Accounting Policies [Line Items] |  |
Home equity lines of credit combined with the balance of the prior mortgage liens | 89.90% |
Maximum [Member] | Buildings and related components [Member] |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful life | 40 years |
Maximum [Member] | Furniture, fixtures and equipment [Member] |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful life | 25 years |
Single-Family Mortgage Loans [Member] |  |
Significant Accounting Policies [Line Items] |  |
Collateral pledged to secure advances | $ 49,616 | 38,342
Single-Family Mortgage Loans [Member] | Maximum [Member] |  |
Significant Accounting Policies [Line Items] |  |
Lending amount up to the percentage of collateral | 85.00% |
Multi-Family Mortgage Loans [Member] |  |
Significant Accounting Policies [Line Items] |  |
Collateral pledged to secure advances | $ 15,125 | 14,854
Multi-Family Mortgage Loans [Member] | Minimum [Member] |  |
Significant Accounting Policies [Line Items] |  |
Fixed rates loans limit, period | 3 years |
Multi-Family Mortgage Loans [Member] | Maximum [Member] |  |
Significant Accounting Policies [Line Items] |  |
Lending amount up to the percentage of collateral | 85.00% |
Fixed rates loans limit, period | 5 years |
Commercial Real Estate [Member] |  |
Significant Accounting Policies [Line Items] |  |
Collateral pledged to secure advances | $ 5,348 | $ 2,793
Commercial Real Estate [Member] | Minimum [Member] |  |
Significant Accounting Policies [Line Items] |  |
Fixed rates loans limit, period | 3 years |
Commercial Real Estate [Member] | Maximum [Member] |  |
Significant Accounting Policies [Line Items] |  |
Lending amount up to the percentage of collateral | 85.00% |
Fixed rates loans limit, period | 5 years |
Construction Loans [Member] | Maximum [Member] |  |
Significant Accounting Policies [Line Items] |  |
Lending amount up to the percentage of collateral | 80.00% |
Maturity of construction loans convert to permanent loans | 30 years |

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