Acquisition (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Business Combinations [Abstract]
Business Combination, Severance and Employee-related									$ 57,868	[1]	$ 21,497	[1]	$ 260	[1]
Business Combination, System Conversion and Integration									1,868		3,829		1,312
Business Combinations, Asset Writedowns Lease Terminations and other facilities-related									6,353		3,212		0
Business Combinations, Segment or Division reorganization									10,073		0		0
Business Combinations, Banking Fees									16,117		5,309		1,298
Business Combinations, Other Expenses									8,737		6,965		1,219
Acquisition, integration and reorganization costs	$ 83,021	$ 85,609	$ 83,167	$ 50,530	$ 49,984	$ 51,170	$ 46,233	$ 43,991	$ 101,016		$ 40,812		$ 4,089

[1] (1)Amount includes $26.1 million in 2014 and $12.4 million in 2013 for accelerated vesting of restricted stock.