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Loans and Asset Quality Information (Details 10) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Activity in the allowance for loan losses for covered loans          
Provisions $ 6,467 $ 10,934 $ 28,022 $ 22,277  
Ending balance - total 2,114,906 2,040,714 2,114,906 2,040,714 2,069,152
Covered
          
Activity in the allowance for loan losses for covered loans          
Beginning balance 6,372 7,002 5,808 11,155 11,155
Charge-offs (1,714) (4,789) (4,148) (12,715) (18,123)
Recoveries               
Provisions 1,273 3,327 4,271 7,100 12,776
Ending balance 5,931 5,540 5,931 5,540 5,808
Individually evaluated for impairment 5,914 5,540 5,914 5,540 5,481
Collectively evaluated for impairment               
Loans acquired with deteriorated credit quality 17    17    327
Ending balance - total 322,895 401,726 322,895 401,726 361,234
Individually evaluated for impairment 42,598 37,149 42,598 37,149 44,723
Collectively evaluated for impairment 280,297 364,577 280,297 364,577 316,511
Loans acquired with deteriorated credit quality $ 4,819 $ 13,538 $ 4,819 $ 13,538 $ 7,864