Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Detail) - Impaired Loans (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Impaired loans with a specific reserve for credit losses (1)	$ 76,397	[1]	$ 13,790	[1]
Impaired loans with no specific reserve (2)	83,090	[2]	173,534	[2]
Total impaired loans individually evaluated for impairment	159,487		187,324
Corporate non-accrual loans not individually evaluated for impairment (3)	15,084	[3]	12,449	[3]
Total corporate non-accrual loans	174,571		199,773
TDRs, still accruing interest	17,864		22,371
Total impaired loans	192,435		222,144
Valuation allowance related to impaired loans	$ 26,095		$ 6,343

[1] These impaired loans require a valuation allowance because the present value of expected future cash flows or the estimated value of the related collateral less estimated selling costs is less than the recorded investment in the loans.

[2] No specific allowance for credit losses is allocated to these loans since they are deemed to be sufficiently collateralized or had charge-offs.

[3] These are loans with balances under a specified threshold.