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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 $)
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance for loan loss required $ 48,610,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment [1] $ 69,487,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment [1] $ 86,381,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment [1]
Impaired loans with no allowance for loan loss required 63,794,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment 57,925,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment 56,596,000us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Total impaired loans 112,404,000us-gaap_ImpairedFinancingReceivableRecordedInvestment [2] 127,412,000us-gaap_ImpairedFinancingReceivableRecordedInvestment [2] 142,977,000us-gaap_ImpairedFinancingReceivableRecordedInvestment [2]
Allowance for loan losses related to impaired loans 6,199,000us-gaap_ImpairedFinancingReceivableRelatedAllowance 6,270,000us-gaap_ImpairedFinancingReceivableRelatedAllowance 8,197,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
Financing Receivable      
Financing Receivable, Impaired [Line Items]      
Allowance for loan losses related to impaired loans 866,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceReceivablesMember		    
TDRs $ 67,218,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceReceivablesMember		 $ 82,275,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceReceivablesMember		 $ 92,517,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceReceivablesMember
[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.