LOAN PORTFOLIO - Loans Held for Investment on Which Accrual of Interest Income had been Discontinued (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Non-performing loans:
Total non-performing loans held for investment	$ 1,008,044	$ 1,138,362
Residential Mortgage Loans [Member]
Non-performing loans:
Total non-performing loans held for investment	320,913	338,208
Commercial mortgage [Member]
Non-performing loans:
Total non-performing loans held for investment	231,163	240,414
Commercial and Industrial Loans [Member]
Non-performing loans:
Total non-performing loans held for investment	230,459	270,171
Construction Loans [Member]
Non-performing loans:
Total non-performing loans held for investment	189,458	250,022
Auto loans [Member]
Non-performing loans:
Total non-performing loans held for investment	17,639	19,641
Finance leases [Member]
Non-performing loans:
Total non-performing loans held for investment	3,061	3,485
Consumer Loans [Member]
Non-performing loans:
Total non-performing loans held for investment	$ 15,351	$ 16,421