Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 262,525	$ 336,150
Overnight investments	943,025	1,387,927
Investment in marketable equity securities	109,907	0
Investment securities available for sale	4,677,351	7,180,180
Investment securities held to maturity	2,253,416	76
Loans held for sale	46,082	51,179
Loans and leases	24,886,347	23,596,825
Allowance for loan and lease losses	(219,197)	(221,893)
Net loans and leases	24,667,150	23,374,932
Premises and equipment	1,167,329	1,138,431
Other real estate owned	43,601	51,097
Income earned not collected	105,616	95,249
Goodwill	208,217	150,601
Other intangible assets	72,748	73,096
Other assets	397,692	688,594
Total assets	34,954,659	34,527,512
Liabilities
Noninterest-bearing deposits	12,212,144	11,237,375
Interest-bearing deposits	17,951,393	18,028,900
Total deposits	30,163,537	29,266,275
Short-term borrowings	687,749	693,807
Long-term obligations	297,487	870,240
FDIC shared-loss payable	104,576	101,342
Other liabilities	202,297	261,784
Total liabilities	31,455,646	31,193,448
Shareholders' Equity
Surplus	600,957	658,918
Retained earnings	3,133,746	2,785,430
Accumulated other comprehensive loss	(247,575)	(122,294)
Total shareholders' equity	3,499,013	3,334,064
Total liabilities and shareholders' equity	34,954,659	34,527,512
Class A Common Stock
Shareholders' Equity
Common stock	10,880	11,005
Class B Common Stock
Shareholders' Equity
Common stock	$ 1,005	$ 1,005