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Purchased Credit Impaired ("PCI") Loans - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Receivables [Abstract]      
PCI loans outstanding   $ 94.9 $ 54.6
Net payment received from FDIC for loss share termination $ 1.3    
Removal of remaining clawback liability, FDIC loss share termination 3.5    
Removal of remaining FDIC receivable, FDIC loss share termination 7.2    
One-time pretax charge $ 2.4