Deposits and Borrowed Funds (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Federal funds purchased, securities sold under repurchase agreements, and other short term borrowings
Balances at Year-end		$ 1,214,200	$ 50,000
Average Balance	514,100	52,051	3,839
Average interest rate (as a percent)	0.18%	0.09%	0.06%
Federal funds purchased
Federal funds purchased, securities sold under repurchase agreements, and other short term borrowings
Balances at Year-end		1,214,200	50,000
Average Balance	301,086	52,051	3,145
Average interest rate (as a percent)	0.13%	0.09%	0.07%
Maximum month-end balance	943,000	1,214,200	100,000
Other short-term borrowings
Federal funds purchased, securities sold under repurchase agreements, and other short term borrowings
Average Balance	213,014		694
Average interest rate (as a percent)	0.26%
Maximum month-end balance	$ 950,000		$ 720