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Investment Securities - Gross Unrealized Losses and Fair Values of Investment Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Available-for-Sale:    
Available-for-Sale, Less than 12 Months, Fair Value $ 467.6 $ 1,123.2
Available-for-sale, Less than 12 Months, Gross Unrealized Losses (3.9) (22.6)
Available-for-Sale, 12 Months or More, Fair Value 407.8 779.0
Available-for-Sale, 12 Months or More, Gross Unrealized Losses (2.6) (14.5)
Available-for-Sale, Total Fair Value 875.4 1,902.2
Available-for-Sale, Total Gross Unrealized Losses (6.5) (37.1)
Held-to-Maturity:    
Held-to-Maturity, Less than 12 Months, Fair Value 19.7 90.4
Held-to-Maturity, Less Than 12 Months, Gross Unrealized Losses (0.1) (2.8)
Held-to-Maturity, 12 Months or More, Fair Value 0.0 216.9
Held-to-Maturity, 12 Months or More, Gross Unrealized Losses 0.0 (5.5)
Held-to-Maturity, Total Fair Value 19.7 307.3
Held-to-Maturity, Total Gross Unrealized Losses (0.1) (8.3)
State, county and municipal securities    
Held-to-Maturity:    
Held-to-Maturity, Less than 12 Months, Fair Value   25.9
Held-to-Maturity, Less Than 12 Months, Gross Unrealized Losses   (0.3)
Held-to-Maturity, 12 Months or More, Fair Value   57.1
Held-to-Maturity, 12 Months or More, Gross Unrealized Losses   (0.6)
Held-to-Maturity, Total Fair Value   83.0
Held-to-Maturity, Total Gross Unrealized Losses   (0.9)
Obligations of U.S. government agencies    
Available-for-Sale:    
Available-for-Sale, Less than 12 Months, Fair Value 168.1 363.1
Available-for-sale, Less than 12 Months, Gross Unrealized Losses (0.8) (7.9)
Available-for-Sale, 12 Months or More, Fair Value 119.4 154.5
Available-for-Sale, 12 Months or More, Gross Unrealized Losses (0.5) (2.3)
Available-for-Sale, Total Fair Value 287.5 517.6
Available-for-Sale, Total Gross Unrealized Losses (1.3) (10.2)
Held-to-Maturity:    
Held-to-Maturity, Less than 12 Months, Fair Value   19.5
Held-to-Maturity, Less Than 12 Months, Gross Unrealized Losses   (0.3)
Held-to-Maturity, 12 Months or More, Fair Value   0.0
Held-to-Maturity, 12 Months or More, Gross Unrealized Losses   0.0
Held-to-Maturity, Total Fair Value   19.5
Held-to-Maturity, Total Gross Unrealized Losses   (0.3)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations    
Available-for-Sale:    
Available-for-Sale, Less than 12 Months, Fair Value 299.5 735.2
Available-for-sale, Less than 12 Months, Gross Unrealized Losses (3.1) (14.5)
Available-for-Sale, 12 Months or More, Fair Value 240.3 503.7
Available-for-Sale, 12 Months or More, Gross Unrealized Losses (1.6) (9.6)
Available-for-Sale, Total Fair Value 539.8 1,238.9
Available-for-Sale, Total Gross Unrealized Losses (4.7) (24.1)
Held-to-Maturity:    
Held-to-Maturity, Less than 12 Months, Fair Value   45.0
Held-to-Maturity, Less Than 12 Months, Gross Unrealized Losses   (2.2)
Held-to-Maturity, 12 Months or More, Fair Value   120.2
Held-to-Maturity, 12 Months or More, Gross Unrealized Losses   (4.3)
Held-to-Maturity, Total Fair Value   165.2
Held-to-Maturity, Total Gross Unrealized Losses   (6.5)
Private mortgage-backed securities    
Available-for-Sale:    
Available-for-Sale, Less than 12 Months, Fair Value 0.0 0.0
Available-for-sale, Less than 12 Months, Gross Unrealized Losses 0.0 0.0
Available-for-Sale, 12 Months or More, Fair Value 48.1 69.4
Available-for-Sale, 12 Months or More, Gross Unrealized Losses (0.5) (1.8)
Available-for-Sale, Total Fair Value 48.1 69.4
Available-for-Sale, Total Gross Unrealized Losses (0.5) (1.8)
Corporate securities    
Available-for-Sale:    
Available-for-Sale, Less than 12 Months, Fair Value   24.9
Available-for-sale, Less than 12 Months, Gross Unrealized Losses   (0.2)
Available-for-Sale, 12 Months or More, Fair Value   51.4
Available-for-Sale, 12 Months or More, Gross Unrealized Losses   (0.8)
Available-for-Sale, Total Fair Value   76.3
Available-for-Sale, Total Gross Unrealized Losses   (1.0)
Held-to-Maturity:    
Held-to-Maturity, Less than 12 Months, Fair Value 19.7 0.0
Held-to-Maturity, Less Than 12 Months, Gross Unrealized Losses (0.1) 0.0
Held-to-Maturity, 12 Months or More, Fair Value 0.0 39.6
Held-to-Maturity, 12 Months or More, Gross Unrealized Losses 0.0 (0.6)
Held-to-Maturity, Total Fair Value 19.7 39.6
Held-to-Maturity, Total Gross Unrealized Losses $ (0.1) $ (0.6)