Consolidated Statement of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest income
Loans and leases, including fees	$ 2,704,156	$ 2,522,567	$ 2,394,082
Deposits at banks	1,221	2,934	88
Federal funds sold	21	57	42
Agreements to resell securities		132	404
Trading account	1,126	1,198	615
Investment securities
Fully taxable	227,116	256,057	324,695
Exempt from federal taxes	8,045	9,142	9,869
Total interest income	2,941,685	2,792,087	2,729,795
Interest expense
NOW accounts	1,343	1,145	850
Savings deposits	68,011	84,314	85,226
Time deposits	46,102	71,014	100,241
Deposits at Cayman Islands office	1,130	962	1,368
Short-term borrowings	1,286	1,030	3,006
Long-term borrowings	225,297	243,866	271,578
Total interest expense	343,169	402,331	462,269
Net interest income	2,598,516	2,389,756	2,267,526
Provision for credit losses	204,000	270,000	368,000
Net interest income after provision for credit losses	2,394,516	2,119,756	1,899,526
Other income
Mortgage banking revenues	349,064	166,021	184,625
Service charges on deposit accounts	446,698	455,095	478,133
Trust income	471,852	332,385	122,613
Brokerage services income	59,059	56,470	49,669
Trading account and foreign exchange gains	35,634	27,224	27,286
Gain on bank investment securities	9	150,187	2,770
Total other-than-temporary impairment ("OTTI") losses	(32,067)	(72,915)	(115,947)
Portion of OTTI losses recognized in other comprehensive income (before taxes)	(15,755)	(4,120)	29,666
Net OTTI losses recognized in earnings	(47,822)	(77,035)	(86,281)
Equity in earnings of Bayview Lending Group LLC	(21,511)	(24,231)	(25,768)
Other revenues from operations	374,287	496,796	355,053
Total other income	1,667,270	1,582,912	1,108,100
Other expense
Salaries and employee benefits	1,314,540	1,203,993	999,709
Equipment and net occupancy	257,551	249,514	216,064
Printing, postage and supplies	41,929	40,917	33,847
Amortization of core deposit and other intangible assets	60,631	61,617	58,103
FDIC assessments	101,110	100,230	79,324
Other costs of operations	733,499	821,797	527,790
Total other expense	2,509,260	2,478,068	1,914,837
Income before taxes	1,552,526	1,224,600	1,092,789
Income taxes	523,028	365,121	356,628
Net income	1,029,498	859,479	736,161
Net income available to common shareholders
Basic	953,390	781,743	675,826
Diluted	$ 953,429	$ 781,765	$ 675,853
Net income per common share
Basic	$ 7.57	$ 6.37	$ 5.72
Diluted	$ 7.54	$ 6.35	$ 5.69