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Borrowing Arrangements (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Borrowing Arrangements    
Investments securing FHLB advances, amortized cost $ 426,092  
Available-for-sale investment securities 430,260 $ 432,535
San Fransisco Branch    
Borrowing Arrangements    
Advances from FHLB 0  
Federal Home Loan Bank Advances [Member] | Securities Pledged as Collateral    
Borrowing Arrangements    
Investments securing FHLB advances, amortized cost 864 1,256
Estimated Fair Value $ 958 $ 1,364