Income Taxes (Details Textual) - USD ($) $ in Thousands, shares in Millions		12 Months Ended
	Oct. 06, 2015	Dec. 31, 2015	Dec. 31, 2014
Statutory Federal Income Tax Rate		35.00%
Income Taxes Receivable		$ 6,200	$ 18,300
Deferred Tax Assets, Valuation Allowance		121,138	130,282
Unused Federal operating loss carryforwards		200,400
Unused State operating loss carryforwards		1,000,000
Unused Federal capital loss carryforwards		82,300
Deferred Tax Assets, Tax Credit Carryforwards, Foreign		28,600
Low Income Housing Tax Credit carryforwards		7,100
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit		4,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		(2,400)	(200)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		$ 900	3,300
Minimum [Member]
State operating loss carryforwards expiration date		Dec. 31, 2016
Federal capital loss carryforward expiration date		1/1/2016
Foreign tax credit carryforward expiration date		Jan. 01, 2016
Tax Credit Carryforward, Expiration Date		Jan. 01, 2034
Open Tax Year		2006
Maximum [Member]
Unused Federal operating loss carryforward expiration date		12/31/2031
State operating loss carryforwards expiration date		Dec. 31, 2035
Federal capital loss carryforward expiration date		12/31/2018
Foreign tax credit carryforward expiration date		Dec. 31, 2021
Tax Credit Carryforward, Expiration Date		Dec. 31, 2035
Open Tax Year		2014
State and Local Jurisdiction [Member] | Minimum [Member]
Income Tax Examination, Year under Examination		2006
State and Local Jurisdiction [Member] | Maximum [Member]
Income Tax Examination, Year under Examination		2013
Internal Revenue Service (IRS) [Member] | Minimum [Member]
Income Tax Examination, Year under Examination		2008
Internal Revenue Service (IRS) [Member] | Maximum [Member]
Income Tax Examination, Year under Examination		2012
Shares Of Common Stock [Member] | Square 1 Financial, Inc. [Member]
Stock Issued During Period, Shares, New Issues	18.1
Unrecognized Tax Rate Benefit (Negative Benefit) [Member]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		$ 4,300	$ 2,400