Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 378,927	$ 416,154
Interest-bearing deposits in other financial institutions	1,281,916	298,759
Federal funds sold and securities purchased under agreements to resell	25,000	1,135
Investment securities AFS, at fair value	3,893,379	3,085,441
Investment securities HTM, net, at amortized cost	1,929,735	1,878,938
Equity securities	17,939	15,106
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	168,281	168,280
Residential loans held for sale	158,202	129,158
Loans	23,621,673	24,451,724
Allowance for loan losses	(290,997)	(383,702)
Loans, net	23,330,676	24,068,022
Tax credit and other investments	301,490	297,232
Premises and equipment, net	383,131	418,914
Bank and corporate owned life insurance	683,610	679,647
Goodwill	1,104,992	1,109,300
Other intangible assets, net	60,296	68,254
Mortgage servicing rights, net	50,329	41,961
Interest receivable	79,011	90,263
Other assets	592,753	653,219
Total assets	34,439,666	33,419,783
Liabilities and Stockholders' Equity
Noninterest-bearing demand deposits	8,170,105	7,661,728
Interest-bearing deposits	19,681,161	18,820,753
Total deposits	27,851,266	26,482,481
Federal funds purchased and securities sold under agreements to repurchase	267,943	192,971
Commercial paper	54,553	59,346
FHLB advances	1,620,880	1,632,723
Allowance for unfunded commitments	41,276	47,776
Accrued expenses and other liabilities	359,626	364,088
Total liabilities	30,444,705	29,328,850
Stockholders’ Equity
Preferred equity	193,195	353,512
Common stock	1,752	1,752
Surplus	1,711,867	1,720,329
Retained earnings	2,628,421	2,458,920
Accumulated other comprehensive income (loss)	(10,813)	12,618
Treasury stock, at cost	(529,461)	(456,198)
Total common equity	3,801,766	3,737,421
Total stockholders’ equity	3,994,961	4,090,933
Total liabilities and stockholders’ equity	$ 34,439,666	$ 33,419,783
Preferred shares authorized (par value $1.00 per share)	750,000	750,000
Preferred shares issued and outstanding	200,000	364,458
Common shares authorized (par value $0.01 per share)	250,000,000	250,000,000
Common shares issued	175,216,409	175,216,409
Common shares outstanding	149,961,231	153,540,224
Preferred shares, par value	$ 1.00	$ 1.00
Common shares, par value	$ 0.01	$ 0.01
Other long-term funding	$ 1,870,040	$ 2,182,188
Fair Value, Inputs, Level 2
Assets
Investment securities AFS, at fair value	3,769,399	3,058,910
Other long-term funding	$ 249,160	$ 549,465