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Allowance for Credit Losses and Credit Quality - Schedule of Investment in Impaired Loan (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Financing Receivable, Impaired      
Recorded investment $ 146,739   $ 85,393
Unpaid principal balance 159,844   89,516
Related allowance (13,105)   (4,123)
Average recorded investment 169,765 $ 63,239  
Interest income recognized 1,414 32  
Commercial Loans      
Financing Receivable, Impaired      
Recorded investment 118,940   60,289
Unpaid principal balance 131,055   63,944
Related allowance (12,115)   (3,655)
Average recorded investment 140,886 33,686  
Interest income recognized 1,289 25  
Residential Mortgage      
Financing Receivable, Impaired      
Recorded investment 14,988   13,679
Unpaid principal balance 15,113   13,743
Related allowance (125)   (64)
Average recorded investment 15,200 15,331  
Interest income recognized 36 0  
Consumer - Other      
Financing Receivable, Impaired      
Recorded investment 12,811   11,425
Unpaid principal balance 13,676   11,829
Related allowance (865)   (404)
Average recorded investment 13,679 14,222  
Interest income recognized 89 7  
With No Related Allowance Recorded | Commercial Loans | Commercial real estate      
Financing Receivable, Impaired      
Recorded investment 15,978   16,145
Unpaid principal balance 15,978   16,145
Related allowance 0   0
Average recorded investment 16,167 16,608  
Interest income recognized 38 7  
With No Related Allowance Recorded | Commercial Loans | Commercial and Industrial      
Financing Receivable, Impaired      
Recorded investment 20,153   14,340
Unpaid principal balance 20,153   14,340
Related allowance 0   0
Average recorded investment 27,540 1,690  
Interest income recognized 286 18  
With No Related Allowance Recorded | Commercial Loans | Energy-Related      
Financing Receivable, Impaired      
Recorded investment 58,155   0
Unpaid principal balance 58,155   0
Related allowance 0   0
Average recorded investment 53,920 0  
Interest income recognized 513 0  
With No Related Allowance Recorded | Residential Mortgage | Residential Mortgage      
Financing Receivable, Impaired      
Recorded investment 1,279   0
Unpaid principal balance 1,279   0
Related allowance 0   0
Average recorded investment 1,289 0  
Interest income recognized 16 0  
With No Related Allowance Recorded | Consumer - Other | Consumer - Home Equity      
Financing Receivable, Impaired      
Recorded investment 0   730
Unpaid principal balance 0   730
Related allowance 0   0
Average recorded investment 0 679  
Interest income recognized 0 7  
With No Related Allowance Recorded | Consumer - Other | Consumer - Other      
Financing Receivable, Impaired      
Recorded investment 0   66
Unpaid principal balance 0   66
Related allowance 0   0
With An Allowance Recorded | Commercial Loans | Commercial real estate      
Financing Receivable, Impaired      
Recorded investment 10,884   12,500
Unpaid principal balance 11,584   13,753
Related allowance (700)   (1,253)
Average recorded investment 12,236 2,987  
Interest income recognized 84 0  
With An Allowance Recorded | Commercial Loans | Commercial and Industrial      
Financing Receivable, Impaired      
Recorded investment 3,011   5,985
Unpaid principal balance 3,504   6,262
Related allowance (493)   (277)
Average recorded investment 9,311 12,374  
Interest income recognized 143 0  
With An Allowance Recorded | Commercial Loans | Energy-Related      
Financing Receivable, Impaired      
Recorded investment 10,759   11,319
Unpaid principal balance 21,681   13,444
Related allowance (10,922)   (2,125)
Average recorded investment 21,712 27  
Interest income recognized 225 0  
With An Allowance Recorded | Residential Mortgage | Residential Mortgage      
Financing Receivable, Impaired      
Recorded investment 13,709   13,679
Unpaid principal balance 13,834   13,743
Related allowance (125)   (64)
Average recorded investment 13,911 15,331  
Interest income recognized 20 0  
With An Allowance Recorded | Consumer - Other | Consumer - Home Equity      
Financing Receivable, Impaired      
Recorded investment 10,089   8,196
Unpaid principal balance 10,793   8,559
Related allowance (704)   (363)
Average recorded investment 10,453 9,720  
Interest income recognized 61 0  
With An Allowance Recorded | Consumer - Other | Consumer - Indirect Automobile      
Financing Receivable, Impaired      
Recorded investment 1,098   1,171
Unpaid principal balance 1,150   1,181
Related allowance (52)   (10)
Average recorded investment 1,353 1,658  
Interest income recognized 8 0  
With An Allowance Recorded | Consumer - Other | Consumer - Credit Card      
Financing Receivable, Impaired      
Recorded investment 458   386
Unpaid principal balance 468   394
Related allowance (10)   (8)
Average recorded investment 453 1,194  
Interest income recognized 0 0  
With An Allowance Recorded | Consumer - Other | Consumer - Other      
Financing Receivable, Impaired      
Recorded investment 1,166   876
Unpaid principal balance 1,265   899
Related allowance (99)   $ (23)
Average recorded investment 1,420 971  
Interest income recognized $ 20 $ 0