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Fair Value Measurements - Fair Value Inputs, Quantitative Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Impaired loans | Minimum | Market Approach Valuation Technique    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value inputs, weighted average range (as a percent) 0.00% 0.00%
Impaired loans | Maximum | Market Approach Valuation Technique    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value inputs, weighted average range (as a percent) 78.11% 66.00%
Impaired loans | Weighted Average | Market Approach Valuation Technique    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value inputs, weighted average range (as a percent) 26.10% 31.00%
Other real estate owned | Minimum | Market Approach Valuation Technique    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value inputs, weighted average range (as a percent) 8.00% 8.00%
Other real estate owned | Maximum | Market Approach Valuation Technique    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value inputs, weighted average range (as a percent) 96.00% 96.00%
Other real estate owned | Weighted Average | Market Approach Valuation Technique    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value inputs, weighted average range (as a percent) 11.55% 18.00%
Long-lived assets to be disposed of by sale | Minimum | Market Approach Valuation Technique    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value inputs, weighted average range (as a percent) 0.00% 0.00%
Long-lived assets to be disposed of by sale | Maximum | Market Approach Valuation Technique    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value inputs, weighted average range (as a percent) 0.00% 9.00%
Long-lived assets to be disposed of by sale | Weighted Average | Market Approach Valuation Technique    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value inputs, weighted average range (as a percent) 0.00% 6.00%
Fair Value Measured on a Non-recurring Basis    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Impaired loans $ 22.2 $ (25.8)
Other real estate owned (1.6) (1.7)
Long-lived assets to be disposed of by sale 0.0 (1.0)
Estimated Fair Value | Fair Value Measured on a Non-recurring Basis    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Impaired loans 32.6 39.3
Other real estate owned 1.3 2.1
Long-lived assets to be disposed of by sale 0.8 1.3
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Non-recurring Basis    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Impaired loans 0.0 0.0
Other real estate owned 0.0 0.0
Long-lived assets to be disposed of by sale 0.0 0.0
Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Non-recurring Basis    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Impaired loans 0.0 0.0
Other real estate owned 0.0 0.0
Long-lived assets to be disposed of by sale 0.0 0.0
Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Impaired loans 32.6 39.3
Other real estate owned 1.3 2.1
Long-lived assets to be disposed of by sale 0.8 1.3
Significant Unobservable Inputs (Level 3) | Estimated Fair Value | Fair Value Measured on a Non-recurring Basis    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Impaired loans $ 32.6 $ 39.3