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Significant Accounting Policies (Details Textual) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Apr. 01, 2016 USD ($) | Jul. 01, 2015 USD ($) agreement
Accounting Policies [Abstract] |  |  |  |  |
Date of discontinued recognition of interest on mortgage and commercial loans | 90 days |  |  |  |
Consumer and other retail loan due date | 120 days |  |  |  |
Minimum duration for past due residential loans to be considered as nonperforming | 90 days |  |  |  |
Payments made to FDIC to terminate loss share agreements | $ 0 | $ 4,849,000 | $ 0 |  |
Previously covered loans | 22,289,000 |  |  |  |
Previously covered OREO | 448,000 |  |  |  |
Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |
Impairment of company's goodwill | $ 0 | 0 | 0 |  |
Lock in period for interest rates | 45 days |  |  |  |
Accumulated other comprehensive income (loss), net of taxes | $ 10,511,000 | 15,904,000 | $ 9,535,000 |  |
Retained earnings | 397,354,000 | $ 337,536,000 |  |  |
Accounting Standards Update, 2018-02 | New Accounting Pronouncement, Early Adoption, Effect |  |  |  |  |
Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |
Accumulated other comprehensive income (loss), net of taxes | 2,046,000 |  |  |  |
Retained earnings | $ 2,046,000 |  |  |  |
Premises |  |  |  |  |
Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |
Estimated life (in years) | 40 years |  |  |  |
Furniture and equipment |  |  |  |  |
Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |
Estimated life (in years) | 7 years |  |  |  |
Computer equipment | Minimum |  |  |  |  |
Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |
Estimated life (in years) | 3 years |  |  |  |
Computer equipment | Maximum |  |  |  |  |
Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |
Estimated life (in years) | 5 years |  |  |  |
Heritage Financial Group |  |  |  |  |
Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |
Number of loss sharing agreements acquired | agreement |  |  |  |  | 2
Cash surrender value of life insurance |  |  |  |  | $ 19,283,000
KeyWorth Bank |  |  |  |  |
Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |
Cash surrender value of life insurance |  |  |  | $ 8,376,000 |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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