Related Party Transaction Related Party Transaction (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended	0 Months Ended		12 Months Ended
	Apr. 07, 2014	Dec. 31, 2014	May 31, 2013	Aug. 01, 2012	Dec. 31, 2012
Capitalsource, Inc. [Member]
Related Party Transaction [Line Items]
Business Acquisition, Effective Date of Acquisition	Apr. 07, 2014	Apr. 07, 2014
Capitalsource, Inc. [Member] | Castle Creek Finance LLC [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction		9,000
First California Financial Group, Inc. [Member]
Related Party Transaction [Line Items]
Business Acquisition, Effective Date of Acquisition			May 31, 2013
First California Financial Group, Inc. [Member] | Castle Creek Finance LLC [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction		1,300
American Perspective Bank [Member]
Related Party Transaction [Line Items]
Business Acquisition, Effective Date of Acquisition				Aug. 01, 2012
American Perspective Bank [Member] | Castle Creek Finance LLC [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction					$ 448