Business Segment Segment Reporting (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Apr. 07, 2014	Dec. 31, 2013	Jun. 30, 2013	May 31, 2013
Loans and Leases Receivable, Net of Deferred Income	$ 11,190,105			$ 4,419,686
Loans and Leases Receivable, Allowance	(82,149)			(90,643)
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered	11,107,956		4,230,318	4,329,043
Goodwill	1,725,153	1,523,055	208,743	209,190	129,070
Finite Lived Core Deposits Customer Relations Net	20,431		17,248	20,190
Assets	15,684,866		6,533,363	6,709,102
Deposits	11,667,797		5,280,987	5,523,000
National Lending Segment [Member]
Loans and Leases Receivable, Net of Deferred Income	7,599,030			472,364
Loans and Leases Receivable, Allowance	(16,110)			(5,726)
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered	7,582,920			466,638
Goodwill	1,445,857			25,678
Finite Lived Core Deposits Customer Relations Net	1,101			2,232
Assets	9,275,500			510,630
Deposits	28,302			0
Other Segments [Member]
Loans and Leases Receivable, Net of Deferred Income	53,081			0
Loans and Leases Receivable, Allowance	0			0
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered	53,081			0
Goodwill	0			0
Finite Lived Core Deposits Customer Relations Net	0			0
Assets	308,427			9,270
Deposits	(270,358)			(34,871)
Pacific Western Bank [Member]
Loans and Leases Receivable, Net of Deferred Income	3,537,994			3,947,322
Loans and Leases Receivable, Allowance	(66,039)			(84,917)
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered	3,471,955			3,862,405
Goodwill	279,296			183,512
Finite Lived Core Deposits Customer Relations Net	19,330			17,958
Assets	6,100,939			6,189,202
Deposits	$ 11,909,853			$ 5,557,871