Reserves on Deposit with the Federal Reserve Bank and Federal Bank Stock Average Required Reserve Balances (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Reserves on Deposit with the Federal Reserve Bank and Federal Bank Stock [Abstract]
Average required reserve balances at FRB San Francisco	$ 131,374	$ 112,173