Allowance For Loan Losses, Allowance For Losses On Lending-Related Commitments And Impaired Loans (Summary Of Impaired Loans, Including Restructured Loans) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012		Jun. 30, 2012
Total impaired loans	$ 190,148		$ 204,545		$ 264,664
Related Allowance			13,575		19,127
Financing Receivable [Member]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	96,519	[1]	89,983	[1]	161,297	[1]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	93,629		114,562		103,367
Total impaired loans	190,148	[2]	204,545	[2]	264,664	[2]
Related Allowance	11,839		13,575		19,127
Restructured loans	$ 126,196		$ 126,473		$ 172,306

[1] These impaired loans require an allowance for loan losses because the estimated fair value of the loans or related collateral is less than the recorded investment in the loans.

[2] Impaired loans are considered by the Company to be non-accrual loans, TDRs or loans with principal and/or interest at risk, even if the loan is current with all payments of principal and interest.