Condensed Statements of Condition (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
ASSETS:
Cash and cash equivalents	$ 644,550	$ 2,427,258		$ 2,001,737	$ 1,927,542
Securities available for sale	280,738	429,266	[1]
Other assets	342,067	369,372
Total assets	46,688,287	44,145,100
LIABILITIES AND STOCKHOLDERS' EQUITY:
Junior subordinated debentures	358,126	357,917
Other liabilities	186,631	181,124
Total liabilities	40,952,625	38,488,836
Stockholders' equity	5,735,662	5,656,264		5,565,704
Total liabilities and stockholders' equity	46,688,287	44,145,100
Parent Company
ASSETS:
Cash and cash equivalents	126,165	113,745		241,268	82,081
Securities available for sale	2,545	2,662
Investments in subsidiaries	5,961,367	5,890,134
Receivables from subsidiaries	5,152	6,580
Other assets	32,458	28,617
Total assets	6,127,687	6,041,738
LIABILITIES AND STOCKHOLDERS' EQUITY:
Junior subordinated debentures	358,126	357,917
Other liabilities	33,899	27,557
Total liabilities	392,025	385,474
Stockholders' equity	5,735,662	5,656,264
Total liabilities and stockholders' equity	$ 6,127,687	$ 6,041,738

[1] At December 31, 2012, the non-credit portion of OTTI recorded in AOCL was $570,000 (before taxes).