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Reserves on Deposit with the Federal Reserve Bank and Federal Bank Stock (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018 and 2017:
 
 
Year ended December 31,
(Dollars in thousands)
 
2018
 
2017
Average required reserve balances at FRB San Francisco
 
$
455,866

 
$
397,235
Shares Held at Federal Reserve Bank and Federal Home Loan Bank
 
 
December 31,
(Dollars in thousands)
 
2018
 
2017
FHLB stock holdings
 
$
17,250

 
$
18,900

FRB stock holdings
 
41,628

 
41,120