Business Segments (Details) (USD $) In Billions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014 item
Business Segments
Reportable business segments	5
Community Banking Division | California
Business segments
Number of full-service branches	358
Community Banking Division | Washington and Oregon
Business segments
Number of full-service branches	45
Commercial Banking
Business segments
Number of divisions	5
Commercial Banking | Maximum
Business segments
Corporate customers revenues	$ 2
Corporate Banking | Minimum
Business segments
Corporate customers revenues	$ 2