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 |
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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 | |||||
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