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Loans and Asset Quality Information (Details 6) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Impaired loans at period end $ 152,731 $ 149,845 $ 140,976
Average amount of impaired loans for period 143,172 160,289 152,312
Impaired loans with related allowance - Related Allowance 16,209 10,746 10,910
Impaired loans with no related allowance - Recorded Investment 62,848 81,269 79,423
Non-covered
      
Impaired loans at period end 94,602 88,463 85,286
Average amount of impaired loans for period 86,723 91,187 89,023
Impaired loans with related allowance - Related Allowance 11,051 6,019 5,804
Impaired loans with no related allowance - Recorded Investment 22,235 31,514 35,721
Covered
      
Impaired loans at period end 58,129 61,382 55,690
Average amount of impaired loans for period 56,449 69,102 63,289
Impaired loans with related allowance - Related Allowance 5,158 4,727 5,106
Impaired loans with no related allowance - Recorded Investment $ 40,613 $ 49,755 $ 43,702