Goodwill and Other Intangible Assets Intangible Assets Schedule (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$ 88,419	$ 6,373	$ 7,274
Finite-Lived Intangible Assets, Gross	102,253	17,479	17,479
Finite-Lived Intangible Assets, Accumulated Amortization	(13,834)	(11,106)	(10,205)
Core Deposits
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	75,117	6,213	7,070
Finite-Lived Intangible Assets, Gross	87,533	16,759	16,759
Finite-Lived Intangible Assets, Accumulated Amortization	(12,416)	(10,546)	(9,689)
Noncompete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	13	26	39
Finite-Lived Intangible Assets, Gross	102	102	102
Finite-Lived Intangible Assets, Accumulated Amortization	(89)	(76)	(63)
Lease Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	116	134	165
Finite-Lived Intangible Assets, Gross	618	618	618
Finite-Lived Intangible Assets, Accumulated Amortization	$ (502)	$ (484)	$ (453)