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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items] |  |
Cash and cash equivalent maturity period | 90 days |
Mortgage loans held for sale | $ 0 | $ 0
Number of days within which accrual of interest income discontinues | 90 days |
Period of consumer loans charged off | 120 days |
Useful life of assets | 60 months |
Goodwill impairment | $ 0 | 0
Minimum probability for recognizing tax benefit | 50.00% |
Unrecognized tax benefits | $ 0 | $ 0
Contractual obligation | 5,969,000 |
Operating Lease Commitments |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Contractual obligation | $ 5,969,000 |
Buildings and Improvements | Minimum |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Useful life of assets | 30 years |
Buildings and Improvements | Maximum |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Useful life of assets | 40 years |
Furniture, Fixtures and Equipment | Minimum |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Useful life of assets | 3 years |
Furniture, Fixtures and Equipment | Maximum |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Useful life of assets | 10 years |

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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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