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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 |  |

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