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Borrowing Arrangements (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Borrowing Arrangements    
Available-for-sale investment securities $ 422,073 $ 443,224
San Fransisco Branch
   
Borrowing Arrangements    
Advances from FHLB 0 0
Federal Home Loan Bank Advances [Member] | Securities Pledged as Collateral
   
Borrowing Arrangements    
Investments securing FHLB advances, amortized cost 1,832 3,985
Available-for-sale investment securities $ 1,975 $ 4,084