Derivatives and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	$ 1,775.6	$ 1,691.2
Derivative Asset, Estimated Fair Value	42.7	28.1
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	2,176.4	1,103.9
Derivative Liabilities, Estimated Fair Value	169.9	18.2
Not Designated as Hedging Instrument | Interest rate swap contracts
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	1,743.3	913.9
Derivative Asset, Estimated Fair Value	42.1	22.2
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	1,743.3	913.9
Derivative Liabilities, Estimated Fair Value	163.7	18.1
Not Designated as Hedging Instrument | Interest rate lock commitments
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	0.0	77.3
Derivative Asset, Estimated Fair Value	0.0	1.8
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	25.9	0.0
Derivative Liabilities, Estimated Fair Value	0.5	0.0
Not Designated as Hedging Instrument | Forward loan sales contracts
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	32.3	0.0
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	0.0	102.4
Derivative Liabilities, Estimated Fair Value	0.0	0.0
Designated as Hedging Instrument [Member] | Interest rate swap contracts
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	0.0	700.0
Derivative Asset, Estimated Fair Value	0.0	4.1
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	0.0	87.6
Derivative Liabilities, Estimated Fair Value	$ 0.0	$ 0.1