Short-term Borrowings/Other Borrowings (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Short-term Debt [Line Items]
Weighted average cost of borrowing (in hundredths)		0.73%
Federal Reserve Bank of San Francisco [Member]
Short-term Debt [Line Items]
Short-term Debt	$ 224.4	$ 250.1
Qualifying loans pledged as collateral for borrowing lines	330.7	346.9
Unused borrowing lines		232.5
Federal Home Loan Bank (FHLB) [Member]
Short-term Debt [Line Items]
Short-term Debt	11.3	17.6
Investment securities pledged as collateral	$ 11.9	$ 18.5

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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