Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Assets
Cash and due from banks	$ 533,599	$ 639,730
Overnight investments	859,324	443,180
Investment securities available for sale	5,387,703	5,226,228
Investment securities held to maturity	907	1,342
Loans held for sale	47,271	86,333
Loans and leases:
Acquired	1,029,426	1,809,235
Originated	12,104,298	11,576,115
Less allowance for loan and lease losses	233,394	319,018
Net loans and leases	12,900,330	13,066,332
Premises and equipment	876,522	882,768
Other real estate owned:
Covered under loss share agreements in other real estate owned	47,081	102,577
Real Estate Acquired Through Foreclosure	36,898	43,513
Income earned not collected	48,390	47,666
Receivable from FDIC for loss share agreements	93,397	270,192
Goodwill	102,625	102,625
Other intangible assets	1,247	3,556
Other assets	263,797	367,610
Total assets	21,199,091	21,283,652
Liabilities
Noninterest-bearing	5,241,817	4,885,700
Interest-bearing	12,632,249	13,200,325
Total deposits	17,874,066	18,086,025
Debt, Current	511,418	568,505
Long-term obligations	510,769	444,921
Payable to FDIC for loss share agreements	109,378	101,641
Other liabilities	116,785	218,553
Total liabilities	19,122,416	19,419,645
Shareholders' Equity
Surplus	143,766	143,766
Retained earnings	1,948,558	1,792,726
Accumulated other comprehensive loss	(25,268)	(82,106)
Total shareholders' equity	2,076,675	1,864,007
Total liabilities and shareholders' equity	21,199,091	21,283,652
Class A Common Stock
Shareholders' Equity
Common stock	8,586	8,588
Class B Common Stock
Shareholders' Equity
Common stock	$ 1,033	$ 1,033