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Borrowing Arrangements (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Borrowing Arrangements    
FHLB Advances, short-term $ 0 $ 4,000,000
San Fransisco Branch
   
Borrowing Arrangements    
Advances from FHLB 0 4,000,000
Interest rate of FHLB advances   3.59%
Federal Home Loan Bank Advances [Member] | Securities Pledged as Collateral
   
Borrowing Arrangements    
Investments securing FHLB advances, amortized cost 4,316,000 4,016,000
Investments securing FHLB advances, market value $ 4,443,000 $ 4,225,000