v2.4.0.6
Goodwill and Intangible Assets (Schedule of Goodwill and Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Goodwill and Intangible Assets [Roll Forward]      
Total goodwill, beginning of period $ 109,639 $ 95,519 $ 95,519
Established through acquisitions 5,915 14,120 0
Total goodwill, end of period 115,554 109,639 95,519
Core deposit intangible, net, beginning of period 18,696    
Total core deposit intangible, end of period 20,166 18,696  
Total goodwill and intangible assets, end of period 135,720 128,335 100,382
Core Deposits [Member]
      
Goodwill and Intangible Assets [Roll Forward]      
Gross core deposit intangible balance, beginning of period 26,652 8,896 8,896
Accumulated amortization, beginning of period (7,956) (4,033) (2,988)
Core deposit intangible, net, beginning of period 18,696 4,863 5,908
Established through acquisitions 5,789 17,755 0
CDI current period amortization (4,319) (3,922) (1,045)
Total core deposit intangible, end of period $ 20,166 $ 18,696 $ 4,863
Estimated life of CDI, in years 10