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Borrowing Arrangements (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Borrowing Arrangements    
Investments securing FHLB advances, amortized cost $ 488,425  
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 710 750
Estimated Fair Value $ 780 $ 825