Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 454,220	$ 376,719
Overnight investments	688,518	1,107,844
Investment in marketable equity securities	315,501	82,333
Debt Securities, Available-for-sale	7,789,034	7,059,674
Investment securities available for sale	7,789,034	7,059,674
Investment securities held to maturity	740,662	30,996
Loans held for sale	76,347	67,869
Loans held for sale	76,300	67,900
Loans and leases	29,240,959	28,881,496
Allowance for loan and lease losses	(209,259)	(225,141)
Total loan and leases	29,031,700	28,656,355
Premises and equipment	1,251,702	1,244,396
Other real estate owned	55,707	46,591
Income earned not collected	125,626	123,154
Goodwill recorded for Community Financial	350,084	349,398
Other intangible assets	63,884	68,276
Other assets	651,468	610,891
Total assets	41,594,453	39,824,496
Deposits [Abstract]
Noninterest-bearing deposits	13,688,744	12,926,796
Interest-bearing deposits	21,657,967	21,504,440
Total deposits	35,346,711	34,431,236
Securities sold under customer repurchase agreements	540,362	442,956
Federal Home Loan Bank borrowings	792,684	572,185
Subordinated Debt	504,145	163,412
Other Borrowings	105,303	148,318
FDIC shared-loss payable	14,737	112,395
Other liabilities	332,991	367,810
Total liabilities	37,636,933	36,238,312
Shareholders' Equity
Preferred stock	3	0
Surplus	339,955	44,081
Retained earnings	3,632,894	3,658,197
Accumulated other comprehensive loss	(25,612)	(126,723)
Total shareholders' equity	3,957,520	3,586,184
Total liabilities and shareholders' equity	41,594,453	39,824,496
Class A Common Stock
Shareholders' Equity
Common stock	9,275	9,624
Class B Common Stock
Shareholders' Equity
Common stock	$ 1,005	$ 1,005