Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Assets
Cash and due from banks	$ 378.0	$ 378.2
Federal funds sold	518.5	199.7
Interest bearing deposits in banks	0.1	0.1
Total cash and cash equivalents	896.6	578.0
Investment securities:
Available-for-sale	5,057.1	5,841.5
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	2,687.5	3,207.9
Investments, Total	7,744.6	9,049.4
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	177.4	223.2
Loans Held for Sale (Table)	0.9	47.4
Loans and Leases Receivable, Collateral for Secured Borrowings	17,844.9	18,279.6
Accounts Receivable, Allowance for Credit Loss	(204.1)	(227.7)
Net loans	17,640.8	18,051.9
Goodwill	1,100.9	1,100.9
Company-owned life insurance	513.0	502.4
Premises and equipment, net of accumulated depreciation	427.2	444.3
Other intangibles, net of accumulated amortization	66.8	81.4
Accrued interest receivable	116.8	129.1
Mortgage servicing rights, net of accumulated amortization	25.7	28.3
Other real estate owned	4.3	16.5
Deferred Income Tax Assets, Net	118.4	150.0
Other assets	304.0	268.4
Total assets	29,137.4	30,671.2
Deposits:
Non-interest bearing	5,797.6	6,029.6
Interest bearing	17,218.0	17,293.5
Total deposits	23,015.6	23,323.1
Securities sold under repurchase agreements	523.9	782.7
Accounts payable and accrued expenses	378.9	380.4
Accrued interest payable	47.0	52.2
Long-term debt	132.2	120.8
Other borrowings	1,567.5	2,603.0
Allowance for credit losses on off-balance sheet credit exposures	5.2	18.4
Subordinated debentures held by subsidiary trusts	163.1	163.1
Total liabilities	$ 25,833.4	$ 27,443.7
Preferred Stock, Par or Stated Value Per Share	$ 0.00001	$ 0.00001
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Preferred Stock, Shares Authorized	100,000
Common Stock, Shares, Issued	104,585,964	103,941,626
Common stock, shares, outstanding	104,585,964	103,941,626
Common Stock, Par or Stated Value Per Share	$ 0.00001	$ 0.00001
Stockholders’ equity:
Nonvoting noncumulative preferred stock without par value; authorized 100,000 shares; no shares issued or outstanding as of December 31, 2019 and 2018	$ 0.0	$ 0.0
Common stock	2,459.5	2,448.9
Retained earnings	1,166.4	1,135.1
Accumulated other comprehensive income (loss), net	(321.9)	(356.5)
Total stockholders’ equity	3,304.0	3,227.5
Total liabilities and stockholders’ equity	$ 29,137.4	$ 30,671.2
Common stock, shares authorized	150,000,000