Investments (Details Textual) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Apr. 07, 2014	Dec. 31, 2013	May 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Proceeds From Sale Of Available For Sale Securities from CapitalSource Inc legacy portfolio	$ 323,600,000
Available For Sale Securities Gross Realized Gains from CapitalSource Inc legacy portfolio	0
Available For Sale Securities Pledged As Collateral Amortized Cost	327,400,000			327,400,000
Proceeds from Sale of Available-for-sale Securities			0	466,534,000	12,810,000
Investments securities available-for-sale						383,723,000		4,444,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	23,011,000	22,291,000	(48,189,000)	45,302,000	(54,599,000)
Federal Home Loan Bank Stock	49,983,000			49,983,000			27,939,000
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	13,296,000	10,172,000	(27,949,000)	23,468,000	(31,904,000)
Government agency and government-sponsored enterprise pass through securities
Schedule of Available-for-sale Securities [Line Items]
Proceeds from Sale of Available-for-sale Securities	797,000	137,300,000
Available-for-sale Securities, Gross Realized Gains	89,000	4,800,000
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from Sale of Available-for-sale Securities					12,400,000
Available-for-sale Securities, Gross Realized Gains					400,000
Federal Home Loan Bank of San Francisco [Member]
Schedule of Available-for-sale Securities [Line Items]
Increase (Decrease) in Marketable Securities, Restricted				$ 22,000,000