Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and due from banks	$ 539,741	$ 534,086
Overnight investments	1,872,594	2,063,132
Investment securities available for sale	7,006,580	6,861,293
Investment securities held to maturity	98	255
Loans Receivable Held-for-sale, Amount	74,401	59,766
Loans and leases:
Purchased credit-impaired (PCI)	809,169	950,516
Non-PCI	20,928,709	19,289,474
Less allowance for loan and lease losses	(218,795)	(206,216)
Net Loans and Leases	21,519,083	20,033,774
Loans and Leases Receivable, Gross	21,737,878	20,239,990
Premises and equipment	1,133,044	1,135,829
Other Real Estate	61,231	65,559
Other real estate owned:
Other Real Estate, Covered	472	6,817
Other Real Estate, Non Covered	60,759	58,742
Income earned not collected	79,839	70,036
FDIC loss share receivable	4,172	4,054
Goodwill	150,601	139,773
Intangible Assets, Net (Excluding Goodwill)	78,040	90,986
Other assets	471,412	417,391
Total assets	32,990,836	31,475,934
Liabilities
Noninterest-bearing	10,130,549	9,274,470
Interest-bearing	18,030,794	17,656,285
Total deposits	28,161,343	26,930,755
Debt, Current	603,487	594,733
Long-term obligations	832,942	704,155
FDIC shared-loss payable	97,008	126,453
Other liabilities	283,629	247,729
Total liabilities	29,978,409	28,603,825
Shareholders' Equity
Surplus	658,918	658,918
Retained earnings	2,476,691	2,265,621
Accumulated other comprehensive loss	(135,192)	(64,440)
Total shareholders' equity	3,012,427	2,872,109
Total liabilities and shareholders' equity	32,990,836	31,475,934
Class A Common Stock
Shareholders' Equity
Common stock	11,005	11,005
Class B Common Stock
Shareholders' Equity
Common stock	$ 1,005	$ 1,005