Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest income
Loans and leases	$ 757,197	$ 967,601	$ 967,737
Investment securities:
U. S. Treasury	1,645	2,471	8,248
Government agency	12,265	15,688	19,848
Residential mortgage-backed securities	22,642	14,388	9,235
Corporate bonds	0	2,574	7,975
State, county and municipal	12	36	174
Other	320	340	548
Total investment securities interest and dividend income	36,884	35,497	46,028
Overnight investments	2,723	1,738	1,394
Total interest income	796,804	1,004,836	1,015,159
Interest expense
Deposits	34,495	57,568	101,888
Short-term borrowings	2,724	5,107	5,993
Long-term obligations	19,399	27,473	36,311
Total interest expense	56,618	90,148	144,192
Net interest income (loss)	740,186	914,688	870,967
Provision for loan and lease losses	(32,255)	142,885	232,277
Net interest income after provision for loan and lease losses	772,441	771,803	638,690
Noninterest income
Gains on acquisitions	0	0	150,417
Cardholder and merchant services	48,360	45,174	56,279
Merchant Discount Fees	56,024	50,298	54,543
Service charges on deposit accounts	60,661	61,564	63,775
Wealth management services	59,628	57,236	54,974
Fees from processing services	22,821	34,816	30,487
Securities gains (losses)	0	2,277	(288)
Other service charges and fees	15,696	14,239	22,647
Mortgage income	11,065	8,072	6,597
Insurance commissions	10,694	9,974	9,165
ATM income	5,026	5,279	6,020
Adjustments for FDIC receivable for loss share agreements	(72,342)	(101,594)	(19,305)
Other	45,970	1,965	29,055
Total noninterest income	263,603	189,300	464,366
Noninterest expense
Salaries and wages	308,941	307,331	308,088
Employee benefits	90,479	78,861	72,526
Occupancy expense	75,718	74,798	74,832
Equipment expense	75,545	74,822	69,951
FDIC insurance expense	10,175	10,656	16,459
Foreclosure-related expenses	17,134	40,654	46,133
Other	193,388	179,811	204,936
Total noninterest expense	771,380	766,933	792,925
Income before income taxes	264,664	194,170	310,131
Income taxes	96,965	59,822	115,103
Income taxes	49,076	95,087	131,740
Net income	$ 167,699	$ 134,348	$ 195,028
Average shares outstanding (in shares)	9,618,952	10,244,472	10,376,445
Cash dividends (in dollars per share)	$ 1.20	$ 1.20	$ 1.20
Net income per share	$ 17.43	$ 13.11	$ 18.80