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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, 2016
USD ($)
SecurityLoan
Sep. 30, 2015
USD ($)
SecurityLoan
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 377 27
Pre-modification outstanding recorded investment $ 224,148 $ 49,640
Post-modification outstanding recorded investment $ 218,596 $ 48,599
Number of loans | SecurityLoan 61 20
Recorded investment $ 11,217 $ 29,468
Commercial Loans | Real Estate    
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 23 8
Pre-modification outstanding recorded investment $ 22,765 $ 26,408
Post-modification outstanding recorded investment $ 16,441 $ 25,572
Number of loans | SecurityLoan 5 4
Recorded investment $ 668 $ 12,939
Commercial Loans | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 49 18
Pre-modification outstanding recorded investment $ 44,144 $ 19,798
Post-modification outstanding recorded investment $ 43,083 $ 19,643
Number of loans | SecurityLoan 21 15
Recorded investment $ 7,476 $ 13,145
Commercial Loans | Energy-Related    
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 28 1
Pre-modification outstanding recorded investment $ 143,012 $ 3,434
Post-modification outstanding recorded investment $ 145,298 $ 3,384
Number of loans | SecurityLoan 1 1
Recorded investment $ 1,394 $ 3,384
Residential Mortgage | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 31 0
Pre-modification outstanding recorded investment $ 4,784 $ 0
Post-modification outstanding recorded investment $ 4,659 $ 0
Number of loans | SecurityLoan 5 0
Recorded investment $ 364 $ 0
Consumer and Other Loans | Consumer - Home Equity    
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 104 0
Pre-modification outstanding recorded investment $ 7,071 $ 0
Post-modification outstanding recorded investment $ 6,805 $ 0
Number of loans | SecurityLoan 16 0
Recorded investment $ 1,037 $ 0
Consumer and Other Loans | Consumer - Other    
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 142 0
Pre-modification outstanding recorded investment $ 2,372 $ 0
Post-modification outstanding recorded investment $ 2,310 $ 0
Number of loans | SecurityLoan 13 0
Recorded investment $ 278 $ 0