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Transactions with Executive Officers, Directors, and Principal Shareholders - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |
Percentage of gross revenue | 5.00% |
Percentage of aggregate amount of consolidated assets | 5.00% |
Director |  |
Related Party Transaction [Line Items] |  |
Related party deposits | $ 10,600,000 | $ 6,400,000
Minimum |  |
Related Party Transaction [Line Items] |  |
Percentage of participation in equity | 10.00% |
Line of Credit | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Available credit line | $ 1,800,000 | 1,800,000.0
Letter of Credit | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Outstanding commitment | 500,000 |
Unfunded Loan Commitment | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Commitment to provide short-term commercial real estate financing | $ 8,000,000 | $ 8,000,000

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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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