Acquisitions (Details Textual) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 06, 2015	Apr. 07, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill	$ 2,173,949				$ 2,176,291				$ 2,173,949	$ 2,176,291	$ 1,720,479			$ 208,743
Acquisition, integration and reorganization costs	$ 115,929	$ 110,958	$ 110,084	$ 111,049	$ 107,849	$ 84,871	$ 86,716	$ 82,024	$ 200	$ 21,247	$ 101,016
Square 1 Financial, Inc. [Member]
Business Acquisition [Line Items]
Assets acquired												$ 4,611,160
Liabilities assumed												3,813,727
Goodwill												$ 446,069
Capitalsource, Inc. [Member]
Business Acquisition [Line Items]
Assets acquired													$ 10,735,352
Liabilities assumed													7,658,164
Goodwill													$ 1,526,282