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Loans - Schedule of Subsequently Defaulted TDRs (Detail) - TDRs Occurring During The Period - Non-Covered TDRs
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
SecurityLoan
Sep. 30, 2014
USD ($)
SecurityLoan
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 27  
Pre-modification outstanding recorded investment $ 49,640  
Post-modification outstanding recorded investment [1] $ 48,599  
Number of loans | SecurityLoan 20 43
Recorded investment $ 29,468 $ 1,825
Commercial Loans | Real Estate    
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 8  
Pre-modification outstanding recorded investment $ 26,408  
Post-modification outstanding recorded investment [1] $ 25,572  
Number of loans | SecurityLoan 4 31
Recorded investment $ 12,939 $ 58
Commercial Loans | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 18  
Pre-modification outstanding recorded investment $ 19,798  
Post-modification outstanding recorded investment [1] $ 19,643  
Number of loans | SecurityLoan 15 11
Recorded investment $ 13,145 $ 1,767
Commercial Loans | Energy-Related    
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 1  
Pre-modification outstanding recorded investment $ 3,434  
Post-modification outstanding recorded investment [1] $ 3,384  
Number of loans | SecurityLoan 1 0
Recorded investment $ 3,384 $ 0
Consumer and Other Loans | Home Equity    
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 0 0
Recorded investment $ 0 $ 0
Consumer and Other Loans | Other    
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 0 1
Recorded investment $ 0 $ 0
[1] Recorded investment includes any allowance for credit losses recorded on the TDRs at the dates indicated.