Organization (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended					0 Months Ended	1 Months Ended
	Sep. 30, 2014 bank_branch		Dec. 31, 2013	Sep. 30, 2013		Apr. 07, 2014 Capitalsource, Inc. [Member]	May 31, 2013 Castle Creek Finance LLC [Member] First California Financial Group, Inc. [Domain]
Business Acquisition [Line Items]
Total assets	$ 15,938,345		$ 6,533,363	$ 6,616,855
Total loans and leases, net	11,492,986		4,230,318	4,299,607
Total deposits	11,523,437	[1]	5,280,987	5,433,144	[2]
Total stockholders' equity	$ 3,478,246		$ 809,093
Number Of Branches	80
Number of Businesses Acquired	27
Business Acquisition, Effective Date of Acquisition						Apr. 07, 2014	May 31, 2013

[1] (1)The negative balance for total deposits in the “Other” segment represents the elimination of holding company cash held in deposit accounts at the Bank.

[2] The negative balance for total deposits in the “Other” segment represents the elimination of holding company cash held in deposit accounts at the Bank.