Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 227.6	$ 261.4
Interest bearing deposits in banks	2,005.8	2,015.3
Federal funds sold	0.1	0.1
Total cash and cash equivalents	2,233.5	2,276.8
Investment securities:
Available-for-sale	4,403.6	4,008.7
Held-to-maturity, net (estimated fair values of $1,632.5 and $55.0 at September 30, 2021 and December 31, 2020, respectively)	1,618.1	51.6
Total investment securities	6,021.7	4,060.3
Mortgage loans held for sale, at fair value	42.5	74.0
Loans held for investment, net of deferred fees and costs	9,622.5	9,807.5
Allowance for credit losses	135.1	144.3
Net loans held for investment	9,487.4	9,663.2
Goodwill	621.6	621.6
Company-owned life insurance	300.5	296.4
Premises and equipment, net of accumulated depreciation	297.3	312.3
Core deposit intangibles, net of accumulated amortization	43.7	51.2
Accrued interest receivable	52.9	51.1
Mortgage servicing rights, net of accumulated amortization and impairment reserve	27.0	24.0
Other real estate owned (“OREO”)	2.3	2.5
Other assets	241.8	215.3
Total assets	19,372.2	17,648.7
Deposits:
Non-interest bearing	5,617.9	4,633.5
Interest bearing	10,389.4	9,583.5
Total deposits	16,007.3	14,217.0
Securities sold under repurchase agreements	1,007.5	1,091.4
Accounts payable and accrued expenses	146.0	144.4
Accrued interest payable	6.6	5.8
Deferred tax liability, net	17.4	27.2
Long-term debt	112.4	112.4
Allowance for credit losses on off-balance sheet credit exposures	3.2	3.7
Subordinated debentures held by subsidiary trusts	87.0	87.0
Total liabilities	17,387.4	15,688.9
Stockholders’ equity:
Nonvoting noncumulative preferred stock without par value; authorized 100,000 shares; no shares issued and outstanding as of September 30, 2021 or December 31, 2020	0.0	0.0
Common stock	943.6	941.1
Retained earnings	1,026.9	962.1
Accumulated other comprehensive income, net	14.3	56.6
Total stockholders’ equity	1,984.8	1,959.8
Total liabilities and stockholders’ equity	$ 19,372.2	$ 17,648.7
Preferred Stock, Shares Authorized	100,000	100,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0