Business Segments (Details)	3 Months Ended
	Mar. 31, 2016 USD ($) branch
Regional Bank | Maximum
Business segments
Servicing Level, Deposits and Investment Balances	$ 500,000,000
Consumer and Business Banking Division | California
Business segments
Number of full-service branches | branch	330
Consumer and Business Banking Division | Washington and Oregon
Business segments
Number of full-service branches | branch	26
Commercial Banking | Maximum
Business segments
Corporate customers revenues	$ 500,000,000
U.S. Wholesale Banking | Minimum
Business segments
Corporate customers revenues	500,000,000
Retail Banking Division [Member] | Regional Bank | Maximum
Business segments
Servicing Level, Deposits and Investment Balances	3,000,000
Wealth Markets Division [Member] | Regional Bank | Minimum
Business segments
Servicing Level, Deposits and Investment Balances	$ 3,000,000