Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets
Cash and due from banks	$ 296,386	$ 539,741
Overnight investments	2,432,233	1,872,594
Investment securities available for sale	6,992,877	7,006,580
Investment securities held to maturity	78	98
Loans held for sale	70,803	74,401
Loans and leases	23,149,073	21,737,878
Less allowance for loan and lease losses	(231,842)	(218,795)
Net loans and leases	22,917,231	21,519,083
Premises and equipment	1,131,558	1,133,044
Other real estate	53,988	61,231
Income earned not collected	90,821	79,839
FDIC shared-loss receivable	4,610	4,172
Goodwill	150,601	150,601
Other intangible assets	77,491	78,040
Other assets	365,477	471,412
Total assets	34,584,154	32,990,836
Liabilities
Noninterest-bearing deposits	11,483,033	10,130,549
Interest-bearing deposits	17,850,916	18,030,794
Total deposits	29,333,949	28,161,343
Short-term borrowings	679,280	603,487
Long-term obligations	866,123	832,942
FDIC shared-loss payable	100,203	97,008
Other liabilities	290,768	283,629
Total liabilities	31,270,323	29,978,409
Shareholders' Equity
Surplus	658,918	658,918
Retained earnings	2,735,227	2,476,691
Accumulated other comprehensive loss	(92,324)	(135,192)
Total shareholders' equity	3,313,831	3,012,427
Total liabilities and shareholders' equity	34,584,154	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