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Loans, Leases and Allowance for Credit Losses - Schedule of Held for Investment Loan Portfolio Composition of Loans, Leases and Allowance for Credit Losses (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans and Leases Receivable, Net of Deferred Income $ 30,026.4 $ 27,053.0
Loans and Leases Receivable, Allowance (232.9) (278.9)
Loans, net 29,793.5 26,774.1
Net deferred loan fees and costs (81.5) (75.4)
Receivable with Imputed Interest, Premium 84.3 26.0
Loans Receivable Held-for-sale, Amount 4,465.2 0.0
Tech & Innovation [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 2,600.3 2,548.3
Other commercial and industrial [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 5,736.1 5,911.2
Commercial Real Estate Owner Occupied [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 1,789.9 1,909.3
Hotel franchise finance [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 1,997.6 1,983.9
Other Commercial Real Estate Non owner Occupied [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 3,663.9 3,640.2
Residential Real Estate [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 5,071.3 2,378.5
Construction And Land Development Land [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 2,853.6 2,429.4
Warehouse lending [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 4,434.7 4,340.2
Municipal and nonprofit [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 1,716.3 1,728.8
Other, loan segment    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Loans and Leases Receivable, Net of Deferred Income $ 162.7 $ 183.2