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Purchased Loans (Details 8) - Purchased loans - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition    
Accretable yield $ (32,025) $ (36,326)
Receivables Acquired with Deteriorated Credit Quality    
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition    
Contractually-required principal and interest 366,954  
Nonaccretable difference (79,190)  
Cash flows expected to be collected 287,764  
Accretable yield (32,025)  
Fair value $ 255,739