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Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans 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
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance for loan loss required [1] $ 50,748 $ 69,487 $ 91,511
Impaired loans with no allowance for loan loss required 52,609 57,925 45,734
Total impaired loans [2] 103,357 127,412 137,245
Allowance for loan losses related to impaired loans 10,075 6,270 10,298
Financing Receivable      
Financing Receivable, Impaired [Line Items]      
Allowance for loan losses related to impaired loans 3,700    
TDRs $ 62,776 $ 82,275 $ 88,107
[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.