CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) (USD $)	6 Months Ended	12 Months Ended
Apr. 30, 2015	Oct. 31, 2014
Stockholders' Equity:
Excess Stock, par value (in dollars per share)	$ 0.01uba_ExcessStockParValue	$ 0.01uba_ExcessStockParValue
Excess Stock, shares authorized (in shares)	20,000,000us-gaap_ExcessStockSharesAuthorized	20,000,000us-gaap_ExcessStockSharesAuthorized
Excess Stock, shares issued (in shares)	0us-gaap_ExcessStockSharesIssued	0us-gaap_ExcessStockSharesIssued
Excess Stock, shares outstanding (in shares)	0us-gaap_ExcessStockSharesOutstanding	0us-gaap_ExcessStockSharesOutstanding
Common Stock, shares authorized (in shares)	30,000,000us-gaap_CommonStockSharesAuthorized
7.125% Series F Cumulative Preferred Stock [Member]
Stockholders' Equity:
Preferred stock, dividend rate (in hundredths)	7.125%	7.125%
Preferred Stock, liquidation preference (in dollars per share)	$ 25	$ 25
Preferred Stock, shares issued (in shares)	5,175,000	5,175,000
Preferred Stock, shares outstanding (in shares)	5,175,000	5,175,000
6.75% Series G Cumulative Preferred Stock [Member]
Stockholders' Equity:
Preferred stock, dividend rate (in hundredths)	6.75%	6.75%
Preferred Stock, liquidation preference (in dollars per share)	$ 25	$ 25
Preferred Stock, shares issued (in shares)	3,000,000	2,800,000
Preferred Stock, shares outstanding (in shares)	3,000,000	2,800,000
Common Stock [Member]
Stockholders' Equity:
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	30,000,000	30,000,000
Common Stock, shares issued (in shares)	9,348,245	9,193,559
Common Stock, shares outstanding (in shares)	9,348,245	9,193,559
Class A Common Stock [Member]
Stockholders' Equity:
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	100,000,000	100,000,000
Common Stock, shares issued (in shares)	26,556,426	23,611,715
Common Stock, shares outstanding (in shares)	26,556,426	23,611,715

Face amount or stated value of excess stock; generally not indicative of the fair market value per share.

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Maximum number of excess stock shares permitted to be issued.

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Number of excess stock shares of an entity that have been sold or granted to shareholders.

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Number of shares of excess stock held by shareholders.

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The percentage rate used to calculate dividend payments on preferred stock.

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The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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