Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets
Cash and due from banks	$ 556,772	$ 539,741
Overnight investments	2,882,789	1,872,594
Investment securities available for sale	6,596,450	7,006,580
Investment securities held to maturity	80	98
Loans held for sale	154,534	74,401
Loans and leases	22,871,465	21,737,878
Less allowance for loan and lease losses	(228,798)	(218,795)
Net loans and leases	22,642,667	21,519,083
Premises and equipment	1,129,993	1,133,044
Other real estate	60,781	61,231
Income earned not collected	86,640	79,839
FDIC shared-loss receivable	3,766	4,172
Goodwill	150,601	150,601
Other intangible assets	80,544	78,040
Other assets	424,233	471,412
Total assets	34,769,850	32,990,836
Liabilities
Noninterest-bearing deposits	11,175,581	10,130,549
Interest-bearing deposits	18,280,757	18,030,794
Total deposits	29,456,338	28,161,343
Short-term borrowings	784,517	603,487
Long-term obligations	879,957	832,942
FDIC shared-loss payable	99,126	97,008
Other liabilities	310,061	283,629
Total liabilities	31,529,999	29,978,409
Shareholders' Equity
Surplus	658,918	658,918
Retained earnings	2,671,766	2,476,691
Accumulated other comprehensive loss	(102,843)	(135,192)
Total shareholders' equity	3,239,851	3,012,427
Total liabilities and shareholders' equity	34,769,850	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