Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets-Accumulated Amortization of Intangible Assets Schedule (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 102,253	$ 102,253	$ 102,253
Finite-Lived Intangible Assets, Accumulated Amortization	(25,367)	(19,498)	(13,834)
Finite-Lived Intangible Assets, Net	76,886	82,755	88,419
Core Deposits
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	87,533	87,533	87,533
Finite-Lived Intangible Assets, Accumulated Amortization	(20,637)	(16,065)	(12,416)
Finite-Lived Intangible Assets, Net	66,896	71,468	75,117
Noncompete Agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross			102
Finite-Lived Intangible Assets, Accumulated Amortization			(89)
Finite-Lived Intangible Assets, Net			13
Lease Agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	618	618	618
Finite-Lived Intangible Assets, Accumulated Amortization	(538)	(520)	(502)
Finite-Lived Intangible Assets, Net	80	98	116
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	14,000	14,000	14,000
Finite-Lived Intangible Assets, Accumulated Amortization	(4,090)	(2,811)	(827)
Finite-Lived Intangible Assets, Net	$ 9,910	$ 11,189	$ 13,173