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Reserves on Deposit with the Federal Reserve Bank and Federal Bank Stock (Tables)
 12 Months Ended
Dec. 31, 2016
Reserves on Deposit with the Federal Reserve Bank and Federal Bank Stock [Abstract]  
Average Required Reserve Balances
The tables below provide information on the required reserve balances at the Federal Reserve, as well as shares held at the FHLB and FRB for the years ended and as of December 31, 2016 and 2015:
 
 
Year ended December 31,
(Dollars in thousands)
 
2016
 
2015
Average required reserve balances at FRB San Francisco
 
$
370,002

 
$
278,101
Shares Held at Federal Reserve Bank and Federal Home Loan Bank
 
 
December 31,
(Dollars in thousands)
 
2016
 
2015
FHLB stock holdings
 
$
17,250

 
$
17,250

FRB stock holdings
 
40,342

 
39,741