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Loans - Schedule of Subsequently Defaulted TDRs (Detail) - TDRs Occurring During The Period - Non-Covered TDRs
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
SecurityLoan
Mar. 31, 2015
USD ($)
SecurityLoan
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 94 7
Pre-modification outstanding recorded investment $ 45,189 $ 15,097
Post-modification outstanding recorded investment $ 44,782 $ 14,812
Number of loans | SecurityLoan 51 41
Recorded investment $ 9,088 $ 372
Commercial Loans | Real Estate    
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 9 1
Pre-modification outstanding recorded investment $ 1,228 $ 1,935
Post-modification outstanding recorded investment $ 1,228 $ 1,743
Number of loans | SecurityLoan 9 31
Recorded investment $ 1,228 $ 0
Commercial Loans | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 14 6
Pre-modification outstanding recorded investment $ 4,927 $ 13,162
Post-modification outstanding recorded investment $ 4,737 $ 13,069
Number of loans | SecurityLoan 9 9
Recorded investment $ 1,627 $ 372
Commercial Loans | Energy-Related    
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 9 0
Pre-modification outstanding recorded investment $ 33,925 $ 0
Post-modification outstanding recorded investment $ 33,925 $ 0
Number of loans | SecurityLoan 1 0
Recorded investment $ 2,250 $ 0
Residential Mortgage | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 15 0
Pre-modification outstanding recorded investment $ 3,295 $ 0
Post-modification outstanding recorded investment $ 3,219 $ 0
Number of loans | SecurityLoan 15 0
Recorded investment $ 3,218 $ 0
Consumer and Other Loans | Home Equity    
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 22 0
Pre-modification outstanding recorded investment $ 1,372 $ 0
Post-modification outstanding recorded investment $ 1,316 $ 0
Number of loans | SecurityLoan 10 0
Recorded investment $ 595 $ 0
Consumer and Other Loans | Consumer and Other Loans    
Accounts, Notes, Loans and Financing Receivable    
Number of loans | SecurityLoan 25 0
Pre-modification outstanding recorded investment $ 442 $ 0
Post-modification outstanding recorded investment $ 357 $ 0
Number of loans | SecurityLoan 7 1
Recorded investment $ 170 $ 0