Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 337,450	$ 362,048
Overnight investments	9,875,063	4,347,336
Investment in marketable equity securities	123,147	91,680
Debt Securities, Available-for-sale	7,371,129	7,014,243
Investment securities held to maturity at cost	3,381,078	2,816,982
Loans held for sale	98,451	124,837
Loans and leases	32,516,189	32,791,975
Allowance for loan and lease losses	(183,194)	(224,314)
Net loans and leases	32,332,995	32,567,661
Premises and equipment	1,230,572	1,251,283
Other real estate owned	40,649	50,890
Income earned not collected	132,911	145,694
Goodwill	350,298	350,298
Other intangible assets	44,142	50,775
Other assets	1,584,092	783,953
Total assets	56,901,977	49,957,680
Deposits [Abstract]
Noninterest-bearing deposits	21,514,407	18,014,029
Interest-bearing deposits	28,551,355	25,417,580
Total deposits	50,065,762	43,431,609
Securities sold under customer repurchase agreements	663,575	641,487
Less: Advances	645,663	655,175
Subordinated Debt	497,427	504,518
Other Borrowings	76,139	88,470
FDIC shared-loss payable	0	15,601
Other liabilities	372,116	391,552
Total liabilities	52,320,682	45,728,412
Shareholders' Equity
Preferred stock	339,937	339,937
Retained earnings	4,263,679	3,867,252
Accumulated other comprehensive loss	(32,137)	12,263
Total shareholders' equity	4,581,295	4,229,268
Total liabilities and shareholders' equity	56,901,977	49,957,680
Class A Common Stock
Shareholders' Equity
Common stock	8,811	8,811
Class B Common Stock
Shareholders' Equity
Common stock	$ 1,005	$ 1,005