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Reserves on Deposit with the Federal Reserve Bank and Federal Bank Stock
 12 Months Ended
Dec. 31, 2021
Federal Home Loan Bank Stock and Federal Reserve Bank Stock [Abstract]  
Reserves on Deposit with the Federal Reserve Bank and Federal Bank Stock Reserves on Deposit with the Federal Reserve Bank and Federal Bank Stock
As was announced on March 15, 2020, the Federal Reserve board reduced reserve requirement ratios to zero percent which effectively eliminated reserve requirements for all depository institutions effective March 26, 2020. Prior to March 26, 2020, the Bank was required to maintain reserves against customer deposits by keeping balances with the Federal Reserve. The cash balances at the Federal Reserve were classified as cash and cash equivalents. Additionally, as a member of the FHLB and FRB, we are required to hold shares of FHLB and FRB stock under the Bank's borrowing agreement. FHLB and FRB stock are recorded at cost as a component of other assets, and any cash dividends received are recorded as a component of other noninterest income.
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, 2021 and 2020:
Year ended December 31,
(Dollars in millions)20212020
Average required reserve balances at FRB San Francisco$— $82 
December 31,
(Dollars in millions)20212020
FHLB stock holdings$26 $17 
FRB stock holdings81 44