Consolidated Statement of Shareholders' Equity (USD $)	Total USD ($)	Common Stock [Member] USD ($)	Additional Paid-in Capital [Member] USD ($)	Retained Earnings [Member] USD ($)	Treasury Stock [Member] USD ($)	Accumulated Other Comprehensive Income (Loss) [Member] USD ($)	First California Financial Group, Inc. [Member]	Capitalsource, Inc. [Member]
Total stockholders' equity at Dec. 31, 2011	$ 546,203,000	$ 375,000	$ 1,084,691,000	$ (556,338,000)	$ (5,328,000)	$ 22,803,000
Shares, Outstanding at Dec. 31, 2011	37,254,318
Net Income	56,801,000			56,801,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	10,097,000	0	0	0	0	10,097,000
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	5,999,000	2,000	5,997,000	0	0	0
Restricted stock surrendered	(1,475,000)	0	0	0	(1,475,000)	0
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	283,000	0	283,000	0	0	0
Dividends, Common Stock, Cash	(28,787,000)	0	(28,787,000)	0	0	0
Restricted Stock Surrendered	(63,681)
Restricted Stock Award, Common Stock Net of Forfeitures	230,272
Total stockholders' equity at Dec. 31, 2012	589,121,000	377,000	1,062,184,000	(499,537,000)	(6,803,000)	32,900,000
Shares, Outstanding at Dec. 31, 2012	37,420,909
Net Income	45,115,000			45,115,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(36,247,000)	0	0	0	0	(36,247,000)
Common stock issued due to acquisition	242,268,000	84,000	242,184,000	0	0	0
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	21,246,000	4,000	21,242,000	0	0	0
Restricted stock surrendered	(13,537,000)	0	0	0	(13,537,000)	0
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	2,133,000	0	2,133,000	0	0	0
Dividends, Common Stock, Cash	(41,006,000)	0	(41,006,000)	0	0	0
Common Stock, Shares, Issued, Acquisitions	46,526,124						8,403,119
Restricted Stock Surrendered	(351,640)
Restricted Stock Award, Common Stock Net of Forfeitures	350,446
Total stockholders' equity at Dec. 31, 2013	809,093,000	465,000	1,286,737,000	(454,422,000)	(20,340,000)	(3,347,000)
Shares, Outstanding at Dec. 31, 2013	45,822,834
Net Income	168,905,000			168,905,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	29,727,000	0	0	0	0	29,727,000
Common stock issued due to acquisition	2,594,070,000	566,000	2,593,504,000	0	0	0
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	36,474,000	11,000	36,463,000	0	0	0
Restricted stock surrendered	(22,307,000)	0		0	(22,307,000)	0
Stock Issued During Period, Value, Dividend Reinvestment Plan	115,000	0	115,000	0	0	0
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	4,625,000	0	4,625,000	0	0	0
Dividends, Common Stock, Cash	(114,277,000)	0	(114,277,000)	0	0	0
Common Stock, Shares, Issued, Acquisitions	104,219,197							56,601,997
Restricted Stock Surrendered	(493,890)
Stock Issued During Period, Shares, Dividend Reinvestment Plan	2,583
Restricted Stock Award, Common Stock Net of Forfeitures	1,088,493
Total stockholders' equity at Dec. 31, 2014	$ 3,506,425,000	$ 1,042,000	$ 3,807,167,000	$ (285,517,000)	$ (42,647,000)	$ 26,380,000
Shares, Outstanding at Dec. 31, 2014	103,022,017