Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Assets
Cash and due from banks	$ 479.0	$ 349.2
Interest bearing deposits in banks	201.4	521.2
Federal funds sold	0.1	0.1
Total cash and cash equivalents	680.5	870.5
Investment securities:
Available-for-sale, net of allowance for credit losses of $1.4 at June 30, 2023 and $0.0 at December 31, 2022 (amortized cost of $6,448.2 at June 30, 2023 and $7,573.5 at December 31, 2022)	5,857.9	6,946.1
Held-to-maturity, net of allowance for credit losses of $0.7 at June 30, 2023 and $1.9 at December 31, 2022 (estimated fair values of $2,924.7 at June 30, 2023 and $3,052.2 at December 31, 2022)	3,317.7	3,451.8
Total investment securities	9,175.6	10,397.9
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	210.4	198.6
Loans held for sale	76.5	79.9
Loans held for investment, net of deferred fees and costs	18,263.4	18,099.2
Allowance for credit losses	224.6	220.1
Net loans held for investment	18,038.8	17,879.1
Goodwill	1,100.9	1,100.9
Bank Owned Life Insurance	502.0	497.9
Premises and equipment, net of accumulated depreciation	443.7	444.7
Other intangibles, net of accumulated amortization	89.1	97.0
Accrued interest receivable	119.1	118.3
Mortgage servicing rights, net of accumulated amortization and impairment reserve	29.8	31.1
Real Estate Acquired Through Foreclosure	14.4	12.7
Deferred tax assets	193.5	210.5
Other assets	302.0	348.7
Total assets	30,976.3	32,287.8
Deposits:
Non-interest bearing	6,518.2	7,560.0
Interest bearing	17,061.0	17,513.6
Total deposits	23,579.2	25,073.6
Securities sold under repurchase agreements	929.9	1,052.9
Accounts payable and accrued expenses	406.5	445.9
Accrued interest payable	45.8	14.5
Long-term debt	120.8	120.8
Other Short-term Borrowings	2,589.0	2,327.0
Allowance for credit losses on off-balance sheet credit exposures	20.8	16.2
Subordinated debentures held by subsidiary trusts	163.1	163.1
Total liabilities	27,855.1	29,214.0
Stockholders’ equity:
Preferred stock, no par value; 100,000 shares authorized; none issued and outstanding	0.0	0.0
Common stock and additional paid-in-capital, $0.00001 par value; 150,000,000 shares authorized; 105,020,683 and 104,442,023 shares were issued and outstanding at June 30, 2023 and December 31, 2022	2,481.4	2,478.2
Retained earnings	1,098.8	1,072.7
Accumulated other comprehensive loss, net	(459.0)	(477.1)
Total stockholders’ equity	3,121.2	3,073.8
Total liabilities and stockholders’ equity	$ 30,976.3	$ 32,287.8
Common Stock, Shares Authorized	150,000,000	150,000,000