Guarantor Information (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010	Dec. 31, 2009
ASSETS
Cash and cash equivalents	$ 1,581,266	$ 820,450	$ 720,925	$ 1,177,020
Restricted cash (including $54.3 million and $46.5 million, respectively, of cash that can only be used to settle obligations of consolidated VIEs)	101,256	128,586
Investment securities:
Available-for-sale, at fair value	1,472,743	1,522,911
Held-to-maturity, at amortized cost	136,250	184,473
Total investment securities	1,608,993	1,707,384
Loans:
Loans held for sale	119,247	205,334
Loans held for investment	5,482,736	6,152,876
Less deferred loan fees and discounts	(77,591)	(106,438)
Less allowance for loan losses	(199,138)	(329,122)
Loans held for investment, net	5,206,007	5,717,316
Total loans	5,325,254	5,922,650
Interest receivable	38,117	57,393
Investment in subsidiaries	0	0
Intercompany receivable	0	0
Other investments	61,665	71,889
Goodwill	173,135	173,135
Other assets	425,258	563,920
Total assets	9,314,944	9,445,407
Liabilities:
Deposits	4,785,790	4,621,273
Credit facilities		67,508
Term debt	697,910	979,254
Other borrowings	1,451,983	1,375,884
Other liabilities	268,911	347,546
Intercompany payable	0	0
Total liabilities	7,204,594	7,391,465
Shareholders' equity:
Common stock ($0.01 par value, 1,200,000,000 shares authorized; 323,179,426 and 323,225,355 shares issued and outstanding, respectively)	3,232	3,232
Additional paid-in capital	3,917,731	3,911,341
(Accumulated deficit) retained earnings	(1,857,311)	(1,870,572)
Accumulated other comprehensive income, net	46,698	9,941
Total Capital Source Inc. shareholders' equity	2,110,350	2,053,942
Noncontrolling interests		0
Total shareholders' equity		2,053,942
Total liabilities and shareholders' equity	9,314,944	9,445,407
CapitalSource Inc. [Member]
ASSETS
Cash and cash equivalents	0	94,614	142,169	99,103
Restricted cash (including $54.3 million and $46.5 million, respectively, of cash that can only be used to settle obligations of consolidated VIEs)	0	0
Investment securities:
Available-for-sale, at fair value	0	0
Held-to-maturity, at amortized cost	0	0
Total investment securities	0	0
Loans:
Loans held for sale	0	0
Loans held for investment	0	0
Less deferred loan fees and discounts	0	0
Less allowance for loan losses	0	0
Loans held for investment, net	0	0
Total loans	0	0
Interest receivable	0	0
Investment in subsidiaries	2,515,652	2,339,200
Intercompany receivable	375,000	375,000
Other investments	0	0
Goodwill	0	0
Other assets	70,053	89,198
Total assets	2,960,705	2,898,012
Liabilities:
Deposits	0	0
Credit facilities		0
Term debt	287,300	285,731
Other borrowings	528,909	523,650
Other liabilities	34,081	34,658
Intercompany payable	0	0
Total liabilities	850,290	844,039
Shareholders' equity:
Common stock ($0.01 par value, 1,200,000,000 shares authorized; 323,179,426 and 323,225,355 shares issued and outstanding, respectively)	3,232	3,232
Additional paid-in capital	3,917,768	3,911,344
(Accumulated deficit) retained earnings	(1,857,283)	(1,870,544)
Accumulated other comprehensive income, net	46,698	9,941
Total Capital Source Inc. shareholders' equity	2,110,415	2,053,973
Noncontrolling interests		0
Total shareholders' equity		2,053,973
Total liabilities and shareholders' equity	2,960,705	2,898,012
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	380,278	353,666	351,053	760,343
Restricted cash (including $54.3 million and $46.5 million, respectively, of cash that can only be used to settle obligations of consolidated VIEs)	36,428	39,335
Investment securities:
Available-for-sale, at fair value	1,448,542	1,510,384
Held-to-maturity, at amortized cost	136,250	184,473
Total investment securities	1,584,792	1,694,857
Loans:
Loans held for sale	112,153	171,887
Loans held for investment	4,901,771	5,008,287
Less deferred loan fees and discounts	(61,293)	(79,877)
Less allowance for loan losses	(158,432)	(223,553)
Loans held for investment, net	4,682,046	4,704,857
Total loans	4,794,199	4,876,744
Interest receivable	29,035	25,780
Investment in subsidiaries	3,156	3,594
Intercompany receivable	0	9
Other investments	37,115	52,066
Goodwill	173,135	173,135
Other assets	204,355	249,119
Total assets	7,242,493	7,468,305
Liabilities:
Deposits	4,785,790	4,621,273
Credit facilities		65,606
Term debt	410,610	693,523
Other borrowings	480,000	412,000
Other liabilities	115,477	170,408
Intercompany payable	0	46,850
Total liabilities	5,791,877	6,009,660
Shareholders' equity:
Common stock ($0.01 par value, 1,200,000,000 shares authorized; 323,179,426 and 323,225,355 shares issued and outstanding, respectively)	921,000	921,000
Additional paid-in capital	(64,036)	74,588
(Accumulated deficit) retained earnings	567,504	457,302
Accumulated other comprehensive income, net	26,148	5,755
Total Capital Source Inc. shareholders' equity	1,450,616	1,458,645
Noncontrolling interests		0
Total shareholders' equity		1,458,645
Total liabilities and shareholders' equity	7,242,493	7,468,305
Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	1,200,131	252,012	182,224	265,977
Restricted cash (including $54.3 million and $46.5 million, respectively, of cash that can only be used to settle obligations of consolidated VIEs)	64,686	85,142
Investment securities:
Available-for-sale, at fair value	0	0
Held-to-maturity, at amortized cost	0	0
Total investment securities	0	0
Loans:
Loans held for sale	6,857	16,202
Loans held for investment	217,396	284,445
Less deferred loan fees and discounts	(5,690)	(10,362)
Less allowance for loan losses	(7,947)	(29,626)
Loans held for investment, net	203,759	244,457
Total loans	210,616	260,659
Interest receivable	23,862	18,174
Investment in subsidiaries	1,507,197	1,561,468
Intercompany receivable	66,103	134,079
Other investments	13,933	13,887
Goodwill	0	0
Other assets	113,982	156,557
Total assets	3,200,510	2,481,978
Liabilities:
Deposits	0	0
Credit facilities		0
Term debt	0	0
Other borrowings	443,074	440,234
Other liabilities	116,527	121,227
Intercompany payable	920,379	301,241
Total liabilities	1,479,980	862,702
Shareholders' equity:
Common stock ($0.01 par value, 1,200,000,000 shares authorized; 323,179,426 and 323,225,355 shares issued and outstanding, respectively)	0	0
Additional paid-in capital	706,074	679,241
(Accumulated deficit) retained earnings	984,104	930,076
Accumulated other comprehensive income, net	30,352	9,959
Total Capital Source Inc. shareholders' equity	1,720,530	1,619,276
Noncontrolling interests		0
Total shareholders' equity		1,619,276
Total liabilities and shareholders' equity	3,200,510	2,481,978
Other Non Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	857	120,158	45,479	51,597
Restricted cash (including $54.3 million and $46.5 million, respectively, of cash that can only be used to settle obligations of consolidated VIEs)	142	4,109
Investment securities:
Available-for-sale, at fair value	24,201	12,527
Held-to-maturity, at amortized cost	0	0
Total investment securities	24,201	12,527
Loans:
Loans held for sale	237	17,245
Loans held for investment	363,569	860,144
Less deferred loan fees and discounts	(13,298)	(18,429)
Less allowance for loan losses	(32,759)	(75,943)
Loans held for investment, net	317,512	765,772
Total loans	317,749	783,017
Interest receivable	(14,780)	13,439
Investment in subsidiaries	1,725,726	1,623,244
Intercompany receivable	920,379	301,241
Other investments	10,617	5,936
Goodwill	0	0
Other assets	183,107	234,034
Total assets	3,167,998	3,097,705
Liabilities:
Deposits	0	0
Credit facilities		1,902
Term debt	0	0
Other borrowings	0	0
Other liabilities	177,055	208,816
Intercompany payable	415,521	441,372
Total liabilities	592,576	652,090
Shareholders' equity:
Common stock ($0.01 par value, 1,200,000,000 shares authorized; 323,179,426 and 323,225,355 shares issued and outstanding, respectively)	0	0
Additional paid-in capital	2,595,280	2,556,428
(Accumulated deficit) retained earnings	(54,748)	(114,898)
Accumulated other comprehensive income, net	34,890	4,087
Total Capital Source Inc. shareholders' equity	2,575,422	2,445,617
Noncontrolling interests		(2)
Total shareholders' equity		2,445,615
Total liabilities and shareholders' equity	3,167,998	3,097,705
Consolidation, Eliminations [Member]
ASSETS
Cash and cash equivalents	0	0	0	0
Restricted cash (including $54.3 million and $46.5 million, respectively, of cash that can only be used to settle obligations of consolidated VIEs)	0	0
Investment securities:
Available-for-sale, at fair value	0	0
Held-to-maturity, at amortized cost	0	0
Total investment securities	0	0
Loans:
Loans held for sale	0	0
Loans held for investment	0	0
Less deferred loan fees and discounts	2,690	2,230
Less allowance for loan losses	0	0
Loans held for investment, net	2,690	2,230
Total loans	2,690	2,230
Interest receivable	0	0
Investment in subsidiaries	(5,751,731)	(5,527,506)
Intercompany receivable	(1,361,482)	(810,329)
Other investments	0	0
Goodwill	0	0
Other assets	(146,239)	(164,988)
Total assets	(7,256,762)	(6,500,593)
Liabilities:
Deposits	0	0
Credit facilities		0
Term debt	0	0
Other borrowings	0	0
Other liabilities	(174,229)	(187,563)
Intercompany payable	(1,335,900)	(789,463)
Total liabilities	(1,510,129)	(977,026)
Shareholders' equity:
Common stock ($0.01 par value, 1,200,000,000 shares authorized; 323,179,426 and 323,225,355 shares issued and outstanding, respectively)	(921,000)	(921,000)
Additional paid-in capital	(3,237,355)	(3,310,260)
(Accumulated deficit) retained earnings	(1,496,888)	(1,272,508)
Accumulated other comprehensive income, net	(91,390)	(19,801)
Total Capital Source Inc. shareholders' equity	(5,746,633)	(5,523,569)
Noncontrolling interests		2
Total shareholders' equity		(5,523,567)
Total liabilities and shareholders' equity	$ (7,256,762)	$ (6,500,593)