Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets:
Cash and Due from Banks	$ 185,341	$ 260,422
Interest-bearing deposits	72,554	69,077
Investment securities available-for-sale, at fair value	2,925,833	2,898,730
Investment securities available-for-sale, at fair value	5,293,918	4,325,420
Federal Home Loan Bank and Federal Reserve Bank stock	149,046	149,286
Loans Held-for-sale, Fair Value Disclosure	35,750	7,908
Loans Receivable Held-for-sale, Amount	36,053	11,869
Loans and leases	20,036,986	18,465,489
Allowance for loan and lease losses	(209,096)	(212,353)
Loans and leases, net	19,827,890	18,253,136
Deferred tax assets, net	61,975	96,516
Premises and equipment, net	270,413	124,850
Goodwill	538,373	538,373
Other intangible assets, net	21,917	25,764
Cash surrender value of life insurance policies	550,651	543,616
Accrued interest receivable and other assets	455,380	313,256
Total assets	30,389,344	27,610,315
Liabilities and Equity [Abstract]
Non-interest-bearing	4,446,463	4,162,446
Interest-bearing	18,878,283	17,696,399
Total deposits	23,324,746	21,858,845
Securities sold under agreements to repurchase and other borrowings	1,040,431	581,874
Advances from Federal Home Loan Banks	1,948,476	1,826,808
Long-term debt	540,364	226,021
Finance Lease, Liability	174,396	0
Accrued expenses and other liabilities	153,161	230,252
Total liabilities	$ 27,181,574	24,723,800
Shareholders’ equity:
Preferred Stock, Par or Stated Value Per Share	$ 0.01
Preferred stock, shares authorized	3,000,000
Preferred Stock, Shares Outstanding	6,000
Common stock par value (in usd per share)	$ 0.01
Common stock, shares issued	93,686,311
Common stock, $.01 par value: Authorized - 200,000,000 shares; (Issued 93,651,601 shares)	$ 937	937
Paid-in capital	1,113,250	1,114,394
Retained earnings	$ 2,061,352	$ 1,828,303
Treasury Stock, Common, Shares	1,659,749	1,508,456
Treasury Stock, Value	$ 76,734	$ 71,504
Accumulated other comprehensive loss, net of tax	(36,072)	(130,652)
Total shareholders' equity	3,207,770	2,886,515
Total liabilities and shareholders' equity	$ 30,389,344	27,610,315
Common Stock, Shares Authorized	200,000,000
Debt Securities, Held-to-maturity, Fair Value	$ 5,380,653	4,209,121
Series F Preferred Stock [Member]
Shareholders’ equity:
Preferred Stock, Par or Stated Value Per Share	$ 0.01
Preferred stock, $.01 par value; Authorized - 3,000,000 shares: Series E issued and outstanding (5,060 shares) Series E issued and outstanding (5,060 shares)Series F issued and outstanding(6,000)Series E issued and outstanding (5,060 shares)	$ 145,037	$ 145,037