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Common and Preferred Stock	12 Months Ended
Common and Preferred Stock	Dec. 31, 2018
Equity [Abstract]
Common and Preferred Stock	Common and Preferred Stock In November of 2018, United’s Board of Directors approved an increase and extension of the existing common stock repurchase plan through December 31, 2019. Under the program, shares may be repurchased periodically in open market transactions at prevailing market prices, in privately negotiated transactions, or by other means in accordance with federal securities laws. The actual timing, number and value of shares repurchased depends on a number of factors, including the market price of United’s common stock, general market and economic conditions, and applicable legal requirements. During 2017 and 2018, no shares were repurchased under the program. As of December 31, 2018, United had remaining authorization to repurchase up to $50.0 million of outstanding common stock under the program. United may issue preferred stock in one or more series, up to a maximum of 10,000,000 shares. Each series shall include the number of shares issued, preferences, special rights and limitations as determined by the Board of Directors. United had no preferred stock outstanding as of December 31, 2018 or 2017.