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Borrowing Arrangements (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Borrowing Arrangements
FHLB Advances, short-term	$ (4,000,000)	$ 0
FHLB Advances, long-term	0	4,000,000
Maximum borrowing capacity on lines of credit	40,000,000	44,000,000
Federal Home Loan Bank Advances | Securities Pledged as Collateral
Borrowing Arrangements
Investments securing FHLB advances, amortized cost	4,016,000	15,272,000
Investments securing FHLB advances, market value	4,225,000	15,683,000
Federal Reserve Bank Advances
Borrowing Arrangements
Line of Credit, Current	127,000	551,000
Federal Reserve Bank Advances | Securities Pledged as Collateral
Borrowing Arrangements
Investments securing FHLB advances, amortized cost	115,000	542,000
Investments securing FHLB advances, market value	129,000	562,000
San Francisco Branch
Borrowing Arrangements
Advances from FHLB	4,000,000	4,000,000
Interest rate of FHLB advances	3.59%
Advances from FHLB	4,000,000	4,000,000
FHLB Advances, short-term	(4,000,000)	0
FHLB Advances, long-term	$ 0	$ 4,000,000

X

- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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Amount of advances from the Federal Home Loan Bank (FHLB).

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Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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Federal Home Loan Bank borrowings due within one year of the latest balance sheet date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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