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Investment Securities - Credit Quality Indicators (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity $ 3,131.6 $ 1,687.6
AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 2,930.2 1,626.2
AA    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 95.1 31.6
A    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 16.0 18.7
BBB    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 75.2 7.0
Not Rated    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 15.1 4.1
U.S. Treasury notes    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 296.7  
U.S. Treasury notes | AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 296.7  
U.S. Treasury notes | AA    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 0.0  
U.S. Treasury notes | A    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 0.0  
U.S. Treasury notes | BBB    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 0.0  
U.S. Treasury notes | Not Rated    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 0.0  
State, county, and municipal securities    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 186.6 67.6
State, county, and municipal securities | AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 69.4 17.2
State, county, and municipal securities | AA    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 95.1 31.6
State, county, and municipal securities | A    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 12.0 14.7
State, county, and municipal securities | BBB    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 0.0 0.0
State, county, and municipal securities | Not Rated    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 10.1 4.1
Obligations of U.S. government agencies    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 328.1  
Obligations of U.S. government agencies | AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 328.1  
Obligations of U.S. government agencies | AA    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 0.0  
Obligations of U.S. government agencies | A    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 0.0  
Obligations of U.S. government agencies | BBB    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 0.0  
Obligations of U.S. government agencies | Not Rated    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 0.0  
Corporate securities    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 84.2 11.0
Corporate securities | AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 0.0 0.0
Corporate securities | AA    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 0.0 0.0
Corporate securities | A    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 4.0 4.0
Corporate securities | BBB    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 75.2 7.0
Corporate securities | Not Rated    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 5.0 0.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 2,236.0 1,609.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | FNMA/FHLMC    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 1,903.2 1,439.1
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | FNMA/FHLMC | AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 1,903.2 1,439.1
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | FNMA/FHLMC | AA    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 0.0 0.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | FNMA/FHLMC | A    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 0.0 0.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | FNMA/FHLMC | BBB    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 0.0 0.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | FNMA/FHLMC | Not Rated    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 0.0 0.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | GNMA    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 332.8 169.9
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | GNMA | AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 332.8 169.9
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | GNMA | AA    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 0.0 0.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | GNMA | A    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 0.0 0.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | GNMA | BBB    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity 0.0 0.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | GNMA | Not Rated    
Schedule of Held-to-maturity Securities [Line Items]    
Investment securities classified as held to maturity $ 0.0 $ 0.0