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Transactions with Executive Officers, Directors, and Principal Shareholders - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
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 | $ 15.3 | $ 10.6
Minimum |  |
Related Party Transaction [Line Items] |  |
Percentage of participation in equity | 10.00% |
Letter of Credit | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Outstanding commitment | $ 0.5 | 0.5
Unfunded Loan Commitment | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Commitment to provide short-term commercial real estate financing |  | $ 8.0

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