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Summary of Significant Accounting Policies (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) branch | Dec. 31, 2016 USD ($)
Significant Accounting Policies [Line Items] |  |
Number of full service offices | branch | 24 |
HTM transfers to AFS securities, fair value | $ 0 | $ 23,100,000
Real Estate - owner-occupied percentage minimum for collateral | 50.00% |
Foreclosed assets | $ 70,000 | 362,000
Excess tax benefit from exercise of stock options and vesting of restricted shares | 853,000 |
Retained earnings | 103,419,000 | $ 92,904,000
Adjustments for New Accounting Principle, Early Adoption [Member] | Accounting Standards Update 2018-02 [Member] |  |
Significant Accounting Policies [Line Items] |  |
Retained earnings | $ 501,000 |
Maximum | Core deposits |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful life of intangible asset | 10 years |
Premises | Minimum |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful lives of premises and equipment | 20 years |
Premises | Maximum |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful lives of premises and equipment | 40 years |
Leasehold improvements, furniture, fixtures and equipment | Minimum |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful lives of premises and equipment | 3 years |
Leasehold improvements, furniture, fixtures and equipment | Maximum |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful lives of premises and equipment | 10 years |

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