Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and due from banks	$ 336,150	$ 539,741
Overnight investments	1,387,927	1,872,594
Investment securities available for sale	7,180,180	7,006,580
Investment securities held to maturity	76	98
Loans held for sale	51,179	74,401
Loans and leases:
Purchased credit-impaired (PCI)	762,998	809,169
Non-PCI	22,833,827	20,928,709
Less allowance for loan and lease losses	(221,893)	(218,795)
Net Loans and Leases	23,374,932	21,519,083
Loans and Leases	23,596,825	21,737,878
Premises and equipment	1,138,431	1,133,044
Other Real Estate	51,097	61,231
Other real estate owned:
Other Real Estate, Covered	271	472
Other Real Estate, Non Covered	50,826	60,759
Income earned not collected	95,249	79,839
FDIC loss share receivable	2,223	4,172
Goodwill	150,601	150,601
Intangible Assets, Net (Excluding Goodwill)	73,096	78,040
Other assets	686,371	471,412
Total assets	34,527,512	32,990,836
Liabilities
Noninterest-bearing	11,237,375	10,130,549
Interest-bearing	18,028,900	18,030,794
Total deposits	29,266,275	28,161,343
Debt, Current	693,807	603,487
Long-term obligations	870,240	832,942
FDIC shared-loss payable	101,342	97,008
Other liabilities	261,784	283,629
Total liabilities	31,193,448	29,978,409
Shareholders' Equity
Surplus	658,918	658,918
Retained earnings	2,785,430	2,476,691
Accumulated other comprehensive loss	(122,294)	(135,192)
Total shareholders' equity	3,334,064	3,012,427
Total liabilities and shareholders' equity	34,527,512	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