Consolidated Statement of Shareholders' Equity (USD $)	Total USD ($)	Common Stock [Member] USD ($)	Shares Of Common Stock [Member] USD ($)	Additional Paid-in Capital [Member] USD ($)	Accumulated Deficit [Member] USD ($)	Treasury Stock [Member] USD ($)	Accumulated Other Comprehensive Income [Member] USD ($)	CapitalSource Inc. [Member] [Member] USD ($)	CapitalSource Inc. [Member] [Member] Common Stock [Member] USD ($)	CapitalSource Inc. [Member] [Member] Shares Of Common Stock [Member]	CapitalSource Inc. [Member] [Member] Additional Paid-in Capital [Member] USD ($)	CapitalSource Inc. [Member] [Member] Accumulated Deficit [Member] USD ($)	CapitalSource Inc. [Member] [Member] Treasury Stock [Member] USD ($)	CapitalSource Inc. [Member] [Member] Accumulated Other Comprehensive Income [Member] USD ($)
Shareholders' Equity - Beginning Balance at Dec. 31, 2013	$ 809,093,000	$ 465,000		$ 1,286,737,000	$ (454,422,000)	$ (20,340,000)	$ (3,347,000)
Shares, Outstanding	103,033,449,000
Net income	35,635,000				35,635,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	23,468,000	0	0	0	0	0	23,468,000
Common Stock, Shares, Issued	104,230,629									56,601,997,000
Common Stock, Value, Issued	1,042,000							2,594,070,000	566,000		2,593,504,000	0	0	0
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited			1,101,838,000
Restricted Stock Award, Forfeitures	30,696,000	11,000		30,685,000	0	0	0
Treasury Stock, Retired, Cost Method, Amount	(22,307,000)	0	(493,890,000)	0	0	(22,307,000)	0
Stock Issued During Period, Shares, Dividend Reinvestment Plan		670,000
Stock Issued During Period, Value, Dividend Reinvestment Plan	29,000	0		29,000	0	0	0
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	4,294,000	0	0	4,294,000		0	0
Dividends paid	37,046,000	0	0	37,046,000	0	0	0
Shareholders' Equity - Ending balance at Jun. 30, 2014	$ 3,437,932,000	$ 1,042,000		$ 3,878,203,000	$ (418,787,000)	$ (42,647,000)	$ 20,121,000