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Loans and Allowance for Loan Losses (Details 4) (Acquired loans, USD $)
9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Sep. 30, 2013
FASB ASC Topic 310-30
Sep. 30, 2012
FASB ASC Topic 310-30
Sep. 30, 2012
FASB ASC Topic 310-30
Peoples
Sep. 30, 2013
FASB ASC Topic 310-30
First Financial
Changes in the carrying value of acquired loans at the acquisition date              
Balance at the beginning of the period $ 2,981,962,000 $ 1,042,610,000 $ 489,853,000 $ 969,395,000 $ 370,581,000    
Fair value of acquired loans       591,951,000 234,245,000    
Net reductions for payments, foreclosures, and accretion       (243,726,000) (115,455,000)    
Change in the allowance for loan losses on acquired loans       (991,000) 482,000    
Balance at the end of the period 2,981,962,000 1,042,610,000 489,853,000 1,316,629,000 489,853,000    
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans              
Balance at beginning of period       160,849,000 94,600,000    
Addition from acquisition           34,921,000 203,194,000
Interest income       (70,697,000) (36,156,000)    
Reclass of nonaccretable difference due to improvement in expected cash flows       48,244,000 26,399,000    
Other changes, net       (9,270,000) (12,418,000)    
Balance at end of period       332,320,000 107,346,000    
Threshold limit for provision of specific reserve on impaired loan       250,000      
Threshold limit of loans for risk assessment by loan officers       25,000      
Previous threshold limit of loans for risk assessment by loan officers       $ 500,000