Business Segment (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Total interest income	$ 204,363	$ 88,360	$ 71,631	$ 292,723	$ 140,900
Interest expense	(11,830)	(2,345)	(3,158)	(14,175)	(6,734)
Intersegment interest income, net	0	0	0	0	0
Interest Income (Expense), Net	192,533	86,015	68,473	278,548	134,166
Provision for Loan, Lease, and Other Losses	(5,030)	644	1,842	(4,386)	(1,295)
Gain (Loss) on Investments	89	4,752	0	4,841	409
Federal Deposit Insurance Corporation Loss Sharing	(8,525)	(11,430)	(5,410)	(19,955)	(8,547)
Noninterest Income, Other	16,915	11,369	5,613	28,284	11,181
Noninterest Income	8,479	4,691	203	13,170	3,043
Foreclosed Real Estate Expense	(497)	1,861	14	1,364	514
Amortization of Intangible Assets	(1,677)	(1,364)	(1,284)	(3,041)	(2,460)
Business Combination, Acquisition Related Costs	(86,242)	(2,200)	(17,997)	(88,442)	(18,689)
Other Expenses	81,490	49,166	44,949	130,656	87,764
Noninterest Expense	(169,906)	(50,869)	(64,216)	(220,775)	(108,399)
Intersegment noninterest income, net	0			0
Total noninterest expense, adjusted for intersegment noninterest net income	(169,906)			(220,775)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	26,076	40,481	6,302	66,557	27,515
Income Tax Expense (Benefit)	(14,846)	(14,576)	(1,906)	(29,422)	(9,625)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	11,230	25,905	4,396	37,135	17,890
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	(1,151)	(1,413)	(81)	(2,564)	(81)
Discontinued Operation, Tax Effect of Discontinued Operation	476	588	34	1,064	34
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax	(675)	(825)	(47)	(1,500)	(47)
Net Income (Loss) Attributable to Parent	10,555	25,080	4,349	35,635	17,843
Pacific Western Bank [Member]
Segment Reporting Information [Line Items]
Total interest income	69,977	77,595	59,321	147,572	116,228
Interest expense	(7,450)	(1,227)	(2,080)	(8,677)	(4,730)
Intersegment interest income, net	4,071	222	460	4,293	931
Interest Income (Expense), Net	66,598	76,590	57,701	143,188	112,429
Provision for Loan, Lease, and Other Losses	4,418	826	2,607	5,244	271
Gain (Loss) on Investments	89	4,752		4,841	409
Federal Deposit Insurance Corporation Loss Sharing	(8,525)	(11,430)	(5,410)	(19,955)	(8,547)
Noninterest Income, Other	3,681	6,897	4,995	10,578	9,996
Noninterest Income	(4,755)	219	(415)	(4,536)	1,858
Foreclosed Real Estate Expense	(633)	1,861	14	1,228	514
Amortization of Intangible Assets	(1,530)	(1,191)	(1,127)	(2,721)	(2,120)
Business Combination, Acquisition Related Costs	(77,713)	(2,200)	(17,997)	(79,913)	(18,689)
Other Expenses	51,507	40,990	37,571	92,497	72,917
Noninterest Expense	(131,383)	(42,520)	(56,681)	(173,903)	(93,212)
Intersegment noninterest income, net	23,533			23,533
Total noninterest expense, adjusted for intersegment noninterest net income	(107,850)			(150,370)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(41,589)	35,115	3,212	(6,474)	21,346
Income Tax Expense (Benefit)	12,081	(12,334)	(612)	(253)	(7,042)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	(29,508)	22,781	2,600	(6,727)	14,304
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	(1,151)	(1,413)	(81)	(2,564)	(81)
Discontinued Operation, Tax Effect of Discontinued Operation	476	588	34	1,064	34
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax	(675)	(825)	(47)	(1,500)	(47)
Net Income (Loss) Attributable to Parent	(30,183)	21,956	2,553	(8,227)	14,257
National Lending Segment [Member]
Segment Reporting Information [Line Items]
Total interest income	132,742	10,765	12,310	143,507	24,672
Interest expense	(62)	(77)	(196)	(139)	(339)
Intersegment interest income, net	(4,071)	(222)	(460)	(4,293)	(931)
Interest Income (Expense), Net	128,609	10,466	11,654	139,075	23,402
Provision for Loan, Lease, and Other Losses	(9,448)	(182)	(765)	(9,630)	(1,566)
Gain (Loss) on Investments	0	0		0	0
Federal Deposit Insurance Corporation Loss Sharing	0	0	0	0	0
Noninterest Income, Other	12,487	4,445	592	16,932	1,136
Noninterest Income	12,487	4,445	592	16,932	1,136
Foreclosed Real Estate Expense	38	0	0	38	0
Amortization of Intangible Assets	(147)	(173)	(157)	(320)	(340)
Business Combination, Acquisition Related Costs	(7,474)	0	0	(7,474)	0
Other Expenses	24,484	6,573	5,980	31,057	12,033
Noninterest Expense	(32,067)	(6,746)	(6,137)	(38,813)	(12,373)
Intersegment noninterest income, net	(23,533)			(23,533)
Total noninterest expense, adjusted for intersegment noninterest net income	(55,600)			(62,346)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	76,048	7,983	5,344	84,031	10,599
Income Tax Expense (Benefit)	(30,259)	(3,331)	(2,237)	(33,590)	(4,436)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	45,789	4,652	3,107	50,441	6,163
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	0	0	0	0	0
Discontinued Operation, Tax Effect of Discontinued Operation	0	0	0	0	0
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax	0	0	0	0	0
Net Income (Loss) Attributable to Parent	45,789	4,652	3,107	50,441	6,163
Other Segments [Member]
Segment Reporting Information [Line Items]
Total interest income	1,644	0	0	1,644	0
Interest expense	(4,318)	(1,041)	(882)	(5,359)	(1,665)
Intersegment interest income, net	0	0	0	0	0
Interest Income (Expense), Net	(2,674)	(1,041)	(882)	(3,715)	(1,665)
Provision for Loan, Lease, and Other Losses	0	0	0	0	0
Gain (Loss) on Investments	0	0		0	0
Federal Deposit Insurance Corporation Loss Sharing	0	0	0	0	0
Noninterest Income, Other	747	27	26	774	49
Noninterest Income	747	27	26	774	49
Foreclosed Real Estate Expense	98	0	0	98	0
Amortization of Intangible Assets	0	0	0	0	0
Business Combination, Acquisition Related Costs	(1,055)	0	0	(1,055)	0
Other Expenses	5,499	1,603	1,398	7,102	2,814
Noninterest Expense	(6,456)	(1,603)	(1,398)	(8,059)	(2,814)
Intersegment noninterest income, net	0			0
Total noninterest expense, adjusted for intersegment noninterest net income	(6,456)			(8,059)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(8,383)	(2,617)	(2,254)	(11,000)	(4,430)
Income Tax Expense (Benefit)	3,332	1,089	943	4,421	1,853
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	(5,051)	(1,528)	(1,311)	(6,579)	(2,577)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	0	0	0	0	0
Discontinued Operation, Tax Effect of Discontinued Operation	0	0	0	0	0
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax	0	0	0	0	0
Net Income (Loss) Attributable to Parent	$ (5,051)	$ (1,528)	$ (1,311)	$ (6,579)	$ (2,577)