Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 356,285	$ 416,154
Interest-bearing deposits in other financial institutions	1,590,494	298,759
Federal funds sold and securities purchased under agreements to resell	0	1,135
Investment securities AFS, at fair value	3,356,949	3,085,441
Investment securities HTM, net, at amortized cost	1,857,087	1,878,938
Equity securities	15,673	15,106
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	168,281	168,280
Residential loans held for sale	153,151	129,158
Loans	24,162,328	24,451,724
Allowance for loan losses	(352,938)	(383,702)
Loans, net	23,809,389	24,068,022
Tax credit and other investments	303,701	297,232
Premises and equipment, net	398,671	418,914
Bank and corporate owned life insurance	680,831	679,647
Goodwill	1,104,992	1,109,300
Other intangible assets, net	64,701	68,254
Mortgage servicing rights, net	49,500	41,961
Interest receivable	86,466	90,263
Other assets	579,084	653,219
Total assets	34,575,255	33,419,783
Liabilities and Stockholders' Equity
Noninterest-bearing demand deposits	8,496,194	7,661,728
Interest-bearing deposits	19,180,972	18,820,753
Total deposits	27,677,166	26,482,481
Federal funds purchased and securities sold under agreements to repurchase	138,507	192,971
Commercial paper	51,171	59,346
FHLB advances	1,629,966	1,632,723
Total long-term funding	2,179,694	2,182,188
Allowance for unfunded commitments	50,776	47,776
Accrued expenses and other liabilities	350,160	364,088
Total liabilities	30,447,474	29,328,850
Stockholders’ Equity
Preferred equity	353,512	353,512
Common stock	1,752	1,752
Surplus	1,706,786	1,720,329
Retained earnings	2,520,144	2,458,920
Accumulated other comprehensive income (loss)	(4,193)	12,618
Treasury stock, at cost	(450,222)	(456,198)
Total common equity	3,774,268	3,737,421
Total stockholders’ equity	4,127,780	4,090,933
Total liabilities and stockholders’ equity	$ 34,575,255	$ 33,419,783
Preferred shares authorized (par value $1.00 per share)	750,000	750,000
Preferred shares issued and outstanding	364,458	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	153,684,904	153,540,224
Preferred shares, par value	$ 1.00	$ 1.00
Common shares, par value	$ 0.01	$ 0.01