Guarantor Information (Details 1) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Interest income:
Loans	$ 113,647	$ 148,797	$ 237,147	$ 305,047
Investment securities	12,688	15,619	31,040	30,210
Other	1,090	304	1,390	877
Total interest income	127,425	164,720	269,577	336,134
Interest expense:
Deposits	13,398	15,279	26,781	31,637
Borrowings	32,409	45,478	65,778	94,121
Total interest expense	45,807	60,757	92,559	125,758
Net interest (loss) income	81,618	103,963	177,018	210,376
Provision for loan losses	1,523	25,262	46,332	244,202
Net interest (loss) income after provision for loan losses	80,095	78,701	130,686	(33,826)
Operating expenses:
Compensation and benefits	29,098	29,423	59,477	63,606
Professional fees	10,914	8,497	18,102	18,867
Other administrative expenses	15,310	15,671	32,004	34,323
Total operating expenses	55,322	53,591	109,583	116,796
Other income (expense):
Gain on investments, net	8,725	10,257	32,240	16,336
(Loss) gain on derivatives	(271)	(3,614)	(2,149)	(7,951)
Net expense of real estate owned and other foreclosed assets	(10,355)	(43,175)	(20,528)	(83,667)
Other (expense) income, net	10,971	1,726	17,498	18,201
Total other income (expense)	9,070	(34,806)	27,061	(57,081)
Net income (loss) from continuing operations before income taxes	33,843	(9,696)	48,164	(207,703)
Income tax expense (benefit)	17,249	(4,174)	28,411	16,832
Net income (loss) from continuing operations	16,594	(5,522)	19,753	(224,535)
Net income from discontinued operations, net of taxes		2,166		9,489
Net gain from sale of discontinued operations, net of taxes		21,696		21,696
Net income (loss)	16,594	18,340	19,753	(193,350)
CapitalSource Inc. [Member]
Interest income:
Loans	10,183	10,191	20,377	20,041
Total interest income	10,183	10,191	20,377	20,041
Interest expense:
Borrowings	23,851	24,109	48,276	53,462
Total interest expense	23,851	24,109	48,276	53,462
Net interest (loss) income	(13,668)	(13,918)	(27,899)	(33,421)
Net interest (loss) income after provision for loan losses	(13,668)	(13,918)	(27,899)	(33,421)
Operating expenses:
Compensation and benefits	667	638	902	860
Professional fees	4,605	480	5,569	1,161
Other administrative expenses	1,017	1,230	2,173	2,367
Total operating expenses	6,289	2,348	8,644	4,388
Other income (expense):
Other (expense) income, net	(17)	(327)	(334)	(499)
Earnings (loss) in subsidiaries	32,703	34,157	59,948	(155,818)
Total other income (expense)	32,686	33,830	59,614	(156,317)
Net income (loss) from continuing operations before income taxes	12,729	17,564	23,071	(194,126)
Income tax expense (benefit)	(3,865)	(776)	3,318	(776)
Net income (loss) from continuing operations		18,340		(193,350)
Net income (loss)	16,594	18,340	19,753	(193,350)
Non-Guarantor Subsidiaries [Member]
Interest income:
Loans	98,409	101,450	203,463	211,811
Investment securities	11,599	15,334	26,322	29,639
Other	404	300	642	870
Total interest income	110,412	117,084	230,427	242,320
Interest expense:
Deposits	13,398	15,279	26,781	31,637
Borrowings	5,054	8,430	10,764	16,619
Total interest expense	18,452	23,709	37,545	48,256
Net interest (loss) income	91,960	93,375	192,882	194,064
Provision for loan losses	6,340	12,310	5,543	97,858
Net interest (loss) income after provision for loan losses	85,620	81,065	187,339	96,206
Operating expenses:
Compensation and benefits	13,116	12,572	25,144	25,842
Professional fees	1,437	643	1,896	1,245
Other administrative expenses	20,445	18,173	42,264	31,065
Total operating expenses	34,998	31,388	69,304	58,152
Other income (expense):
Gain on investments, net	8,413	8,727	20,062	13,946
(Loss) gain on derivatives	(358)	837	(1,135)	(705)
Net expense of real estate owned and other foreclosed assets	(10,589)	(4,745)	(12,932)	(9,183)
Other (expense) income, net	6,911	17,668	11,890	31,145
Earnings (loss) in subsidiaries	(78)	(3,105)	(1,176)	(3,619)
Total other income (expense)	4,299	19,382	16,709	31,584
Net income (loss) from continuing operations before income taxes	54,921	69,059	134,744	69,638
Income tax expense (benefit)	17,764	(2,046)	24,544	123
Net income (loss) from continuing operations		71,105		69,515
Net income (loss)	37,157	71,105	110,200	69,515
Guarantor Subsidiaries [Member]
Interest income:
Loans	11,837	13,925	9,946	24,742
Investment securities		30	7	77
Other	686	2	741	3
Total interest income	12,523	13,957	10,694	24,822
Interest expense:
Borrowings	4,031	7,764	8,948	15,487
Total interest expense	4,031	7,764	8,948	15,487
Net interest (loss) income	8,492	6,193	1,746	9,335
Provision for loan losses	(3,258)	(24,316)	36,945	(23,524)
Net interest (loss) income after provision for loan losses	11,750	30,509	(35,199)	32,859
Operating expenses:
Compensation and benefits	15,902	16,213	34,849	36,904
Professional fees	5,093	6,537	9,927	13,912
Other administrative expenses	9,468	11,424	20,507	24,891
Total operating expenses	30,463	34,174	65,283	75,707
Other income (expense):
Gain on investments, net	8	251	30	147
(Loss) gain on derivatives	5,559	10,906	4,437	16,137
Net expense of real estate owned and other foreclosed assets	(47)	(178)	(236)	(1,002)
Other (expense) income, net	22,243	4,650	40,969	28,105
Earnings (loss) in subsidiaries	37,015	60,411	109,300	52,275
Total other income (expense)	64,778	76,040	154,500	95,662
Net income (loss) from continuing operations before income taxes	46,065	72,375	54,018	52,814
Income tax expense (benefit)			(10)
Net income (loss) from continuing operations		72,375		52,814
Net income (loss)	46,065	72,375	54,028	52,814
Other Non Guarantor Subsidiaries [Member]
Interest income:
Loans	10,048	37,434	30,586	77,434
Investment securities	1,089	255	4,711	494
Other		2	7	4
Total interest income	11,137	37,691	35,304	77,932
Interest expense:
Borrowings	12,537	18,214	23,790	33,991
Total interest expense	12,537	18,214	23,790	33,991
Net interest (loss) income	(1,400)	19,477	11,514	43,941
Provision for loan losses	(1,559)	37,268	3,844	169,868
Net interest (loss) income after provision for loan losses	159	(17,791)	7,670	(125,927)
Operating expenses:
Professional fees	(221)	837	710	2,549
Other administrative expenses	5,271	(1,419)	9,650	12,189
Total operating expenses	5,050	(582)	10,360	14,738
Other income (expense):
Gain on investments, net	304	1,279	12,148	2,243
(Loss) gain on derivatives	(5,472)	(15,357)	(5,451)	(23,383)
Net expense of real estate owned and other foreclosed assets	281	(38,252)	(7,360)	(73,482)
Other (expense) income, net	3,569	(6,394)	6,592	(4,408)
Earnings (loss) in subsidiaries	42,041	71,077	55,191	49,318
Total other income (expense)	40,723	12,353	61,120	(49,712)
Net income (loss) from continuing operations before income taxes	35,832	(4,856)	58,430	(190,377)
Income tax expense (benefit)	3,350	(1,352)	559	17,485
Net income (loss) from continuing operations		(3,504)		(207,862)
Net income from discontinued operations, net of taxes		2,166		9,489
Net gain from sale of discontinued operations, net of taxes		21,696		21,696
Net income (loss)	32,482	20,358	57,871	(176,677)
Consolidation, Eliminations [Member]
Interest income:
Loans	(16,830)	(14,203)	(27,225)	(28,981)
Total interest income	(16,830)	(14,203)	(27,225)	(28,981)
Interest expense:
Borrowings	(13,064)	(13,039)	(26,000)	(25,438)
Total interest expense	(13,064)	(13,039)	(26,000)	(25,438)
Net interest (loss) income	(3,766)	(1,164)	(1,225)	(3,543)
Net interest (loss) income after provision for loan losses	(3,766)	(1,164)	(1,225)	(3,543)
Operating expenses:
Compensation and benefits	(587)		(1,418)
Other administrative expenses	(20,891)	(13,737)	(42,590)	(36,189)
Total operating expenses	(21,478)	(13,737)	(44,008)	(36,189)
Other income (expense):
Other (expense) income, net	(21,735)	(13,871)	(41,619)	(36,142)
Earnings (loss) in subsidiaries	(111,681)	(162,540)	(223,263)	57,844
Total other income (expense)	(133,416)	(176,411)	(264,882)	21,702
Net income (loss) from continuing operations before income taxes	(115,704)	(163,838)	(222,099)	54,348
Net income (loss) from continuing operations		(163,838)		54,348
Net income (loss)	$ (115,704)	$ (163,838)	$ (222,099)	$ 54,348