XML 12 R39.htm IDEA: XBRL DOCUMENT
v3.3.0.814

Common Stock Dividend (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Oct. 16, 2015 | Sep. 22, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2015
Subsequent Event [Line Items] |  |  |  |  |
Common stock, dividend rate, declared |  | 1.00% | 1.00% | 1.00% |
Additional number of shares issued to shareholders (in shares) |  |  | 155,796 | 154,249 |
Amount transferred from retained earnings to common stocks based on closing price on declaration date |  | $ 805,639 | $ 800,777 | $ 828,327 |
Closing price of common stock on declaration date (in dollars per share) |  | $ 5.12 |  |  |
Percentage of stock dividend declared on common stocks outstanding (in hundredths) |  |  |  |  | 1.00%
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Additional number of shares issued to shareholders (in shares) | 157,357 |  |  |  |

X
- Definition This element represents value of shares transferred from retained earning to common stock based on closing price on declaration date. + References No definition available. + Details
Name: | ubfo_AmountTransferredFromRetainedEarningsToCommonStocksBasedOnClosingPriceOnDeclarationDate
Namespace Prefix: | ubfo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Closing price per share amount for each share of common stock offered in the stock market on declaration date. + References No definition available. + Details
Name: | ubfo_ClosingPriceOfCommonStockOnDeclarationDate
Namespace Prefix: | ubfo_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Common Stock, Dividend Rate, Declared + References No definition available. + Details
Name: | ubfo_CommonStockDividendRateDeclared
Namespace Prefix: | ubfo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of stock dividends for common shareholders declared by an entity during the period. + References No definition available. + Details
Name: | ubfo_PercentageOfStockDividendDeclaredOnCommonStocksOutstanding
Namespace Prefix: | ubfo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares of common stock issued as dividends during the period. Excludes stock splits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
Name: | us-gaap_CommonStockDividendsShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |