Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 248,139	$ 336,150
Overnight investments	1,946,882	1,387,927
Marketable equity securities	110,107	0
Investment securities available for sale	6,857,740	7,180,180
Investment securities held to maturity	74	76
Loans held for sale	46,660	51,179
Loans and Leases	23,611,977	23,596,825
Less allowance for loan and lease losses	(223,116)	(221,893)
Net loans and leases	23,388,861	23,374,932
Premises and equipment	1,140,820	1,138,431
Other real estate	48,089	51,097
Income earned not collected	96,607	95,249
FDIC shared-loss receivable	3,636	2,223
Goodwill	150,601	150,601
Other intangible assets	68,668	73,096
Other assets	329,553	686,371
Total assets	34,436,437	34,527,512
Liabilities
Noninterest-bearing deposits	12,000,741	11,237,375
Interest-bearing deposits	17,968,504	18,028,900
Total deposits	29,969,245	29,266,275
Short-term borrowings	554,758	693,807
Long-term obligations	194,413	870,240
FDIC shared-loss payable	102,466	101,342
Other liabilities	243,441	261,784
Total liabilities	31,064,323	31,193,448
Shareholders' Equity
Surplus	658,918	658,918
Retained earnings	2,931,509	2,785,430
Accumulated other comprehensive loss	(230,323)	(122,294)
Total shareholders' equity	3,372,114	3,334,064
Total liabilities and shareholders' equity	34,436,437	34,527,512
Class A Common Stock
Shareholders' Equity
Common stock	11,005	11,005
Class B Common Stock
Shareholders' Equity
Common stock	$ 1,005	$ 1,005