Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 395,364	$ 362,048
Overnight investments	7,871,382	4,347,336
Investment in marketable equity securities	118,540	91,680
Debt Securities, Available-for-sale	7,381,083	7,014,243
Investment securities held to maturity at cost	3,394,604	2,816,982
Loans held for sale	107,768	124,837
Loans and leases	32,689,652	32,791,975
Allowance for loan and lease losses	(189,094)	(224,314)
Net loans and leases	32,500,558	32,567,661
Premises and equipment	1,237,860	1,251,283
Other real estate owned	43,685	50,890
Income earned not collected	133,043	145,694
Goodwill	350,298	350,298
Other intangible assets	47,439	50,775
Other assets	1,593,694	783,953
Total assets	55,175,318	49,957,680
Deposits [Abstract]
Noninterest-bearing deposits	20,974,111	18,014,029
Interest-bearing deposits	27,436,485	25,417,580
Total deposits	48,410,596	43,431,609
Securities sold under customer repurchase agreements	692,604	641,487
Federal Home Loan Bank borrowings	646,667	655,175
Subordinated Debt	497,290	504,518
Other Borrowings	80,531	88,470
FDIC shared-loss payable	0	15,601
Other liabilities	371,140	391,552
Total liabilities	50,698,828	45,728,412
Shareholders' Equity
Preferred stock	339,937	339,937
Retained earnings	4,148,857	3,867,252
Accumulated other comprehensive loss	(22,120)	12,263
Total shareholders' equity	4,476,490	4,229,268
Total liabilities and shareholders' equity	$ 55,175,318	$ 49,957,680
Preferred stock, shares issued	345,000	345,000
Preferred stock, shares outstanding	345,000	345,000
Class A Common Stock
Shareholders' Equity
Common stock	$ 8,811	$ 8,811
Common stock, shares issued	8,811,220	8,811,220
Common stock, shares outstanding	8,811,220	8,811,220
Class B Common Stock
Shareholders' Equity
Common stock	$ 1,005	$ 1,005
Common stock, shares issued	1,005,185	1,005,185
Common stock, shares outstanding	1,005,185	1,005,185