Components of deferred tax assets and liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Deferred Tax Assets Gross Abstract
Deferred Tax Assets Tax Credit Carryforwards Other	$ 8,691	$ 8,195
Deferred Tax Asset Operating Loss Carryforwards And Other Carryforwards	1,248,497	1,269,523
Deferred Tax Assets Tax Deferred Expense Compensation And Benefits	47,578	51,742
Allowance for loan losses	744,261	760,956
Deferred Tax Assets Depreciation	7,753	7,577
Other temporary differences	35,481	34,443
Total gross deferred tax assets	2,111,089	2,152,702
Deferred Tax Liabilities Abstract
Deferred Tax Liabilities Deferred Expense Deferred Policy Acquisition Cost	35,391	37,938
Deferred Tax Liabilities Parents Basis In Discontinued Operation	407	349
FDIC-assisted transaction	60,981	79,381
Deferred Tax Liabilities, Investments	20,760	3,822
Other temporary differences	15,190	13,038
Total gross deferred tax liabilities	132,872	135,082
Valuation allowance	1,224,806	1,257,977
Net deferred tax asset	753,411	759,643
Loans Member
Deferred Tax Assets Gross Abstract
Deferred Tax Assets Deferred Income	7,059	7,718
Deferred Tax Liabilities Abstract
Deferred Tax Liabilities Deferred Expense Deferred Financing Costs	143	554
Sale Leaseback [Member]
Deferred Tax Assets Gross Abstract
Deferred Tax Assets Deferred Income	8,695	9,313
Intercompany [Member]
Deferred Tax Assets Gross Abstract
Deferred Tax Assets Deferred Income	$ 3,074	$ 3,235