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FDIC Indemnification Asset and True-up Payment Obligation and FDIC shared-loss expense (Fair value and the undiscounted amount of the true-up payment obligation and FDIC shared-loss expense) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
FDIC-Assisted Acquisition [Abstract]    
Business Combination Contingent Consideration Liability $ 24,658 $ 21,981
Business Combination Contingent Consideration Potential Cash Payment $ 34,956 $ 40,266