Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets
Cash and due from banks	$ 502,273	$ 539,741
Overnight investments	2,736,514	1,872,594
Investment securities available for sale	7,119,861	7,006,580
Investment securities held to maturity	83	98
Loans held for sale	49,952	74,401
Loans and leases	21,906,449	21,737,878
Less allowance for loan and lease losses	(220,943)	(218,795)
Net loans and leases	21,685,506	21,519,083
Premises and equipment	1,123,838	1,133,044
Other real estate	56,491	61,231
Income earned not collected	80,456	79,839
FDIC shared-loss receivable	3,981	4,172
Goodwill	150,601	150,601
Other intangible assets	75,325	78,040
Other assets	433,524	471,412
Total assets	34,018,405	32,990,836
Liabilities
Noninterest-bearing deposits	10,797,613	10,130,549
Interest-bearing deposits	18,205,155	18,030,794
Total deposits	29,002,768	28,161,343
Short-term borrowings	795,587	603,487
Long-term obligations	727,500	832,942
FDIC shared-loss payable	98,013	97,008
Other liabilities	293,841	283,629
Total liabilities	30,917,709	29,978,409
Shareholders' Equity
Surplus	658,918	658,918
Retained earnings	2,540,709	2,476,691
Accumulated other comprehensive loss	(110,941)	(135,192)
Total shareholders' equity	3,100,696	3,012,427
Total liabilities and shareholders' equity	34,018,405	32,990,836
Class A Common Stock
Shareholders' Equity
Common stock	11,005	11,005
Class B Common Stock
Shareholders' Equity
Common stock	$ 1,005	$ 1,005