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Summary of Significant Accounting Policies (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) branch | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($) | Jan. 01, 2018 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Number of full service offices | branch | 21 |  |  |
HTM transfers to AFS securities, fair value | $ 0 |  |  |
Real Estate - owner-occupied percentage minimum for collateral | 50.00% |  |  |
Foreclosed assets | $ 0 | $ 70,000 |  |
Excess tax benefit from exercise of stock options and vesting of restricted shares | 165,000 | 853,000 |  |
Retained earnings | $ 120,294,000 | $ 103,419,000 |  |
Minimum | Core deposits |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life of intangible asset | 5 years |  |  |
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 |  |  |
Retained Earnings | Accounting Standards Update 2016-01 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Effect of accounting principle |  |  |  | $ 144,000
Forecast | Accounting Standards Update 2016-02 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Right-of-use asset and lease liability |  |  | $ 10,000,000 |

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