Acquisition Schedule of Preliminary Purchase Price Allocation (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2014 Acquisition-related Costs [Member]	May 30, 2014 Acquisition-related Costs [Member]
Business Acquisition [Line Items]
Cash and cash equivalents					$ 879,735
Securities available for sale					154,227
Loans, net of unearned discounts	10,746,784	9,515,700	9,306,454		670,637
Premises and equipment					22,912
Core deposit intangible assets					9,300
Goodwill	653,849	536,649		117,200	117,200
Other assets					33,621
Deposits	(23,490,603)	(20,688,786)			(1,624,043)
Other borrowings					(63,592)
Other liabilities					(1,199)
Preliminary purchase price allocation					$ 198,798