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Allowance for Credit Losses and Credit Quality - Schedule of Investment in Impaired Loan (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Financing Receivable, Impaired          
Recorded investment $ 74,630   $ 74,630   $ 36,560
Unpaid principal balance 76,479   76,479   37,327
Related allowance (1,849)   (1,849)   (767)
Average recorded investment 77,030 $ 40,761 75,501 $ 41,026  
Interest income recognized 327 22 933 379  
Commercial Loans          
Financing Receivable, Impaired          
Recorded investment 52,016   52,016   11,443
Unpaid principal balance 53,724   53,724   11,876
Related allowance (1,708)   (1,708)   (433)
Average recorded investment 53,351 12,522 51,078 13,648  
Interest income recognized 324 17 929 168  
Consumer and Other Loans          
Financing Receivable, Impaired          
Recorded investment 7,806   7,806   11,006
Unpaid principal balance 7,876   7,876   11,088
Related allowance (70)   (70)   (82)
Average recorded investment 8,671 10,934 9,323 11,037  
Interest income recognized 3 5 4 92  
Residential Mortgage          
Financing Receivable, Impaired          
Recorded investment 14,808   14,808   14,111
Unpaid principal balance 14,879   14,879   14,363
Related allowance (71)   (71)   (252)
Average recorded investment 15,008 17,305 15,100 16,341  
Interest income recognized 0 0 0 119  
With No Related Allowance Recorded | Commercial Loans | Real Estate          
Financing Receivable, Impaired          
Recorded investment 16,491   16,491   6,680
Unpaid principal balance 16,491   16,491   6,680
Related allowance 0   0   0
Average recorded investment 16,018 7,026 16,036 7,114  
Interest income recognized 37 6 79 20  
With No Related Allowance Recorded | Commercial Loans | Commercial and Industrial          
Financing Receivable, Impaired          
Recorded investment 20,360   20,360   2,483
Unpaid principal balance 20,360   20,360   2,483
Related allowance 0   0   0
Average recorded investment 20,055 3,553 20,630 4,417  
Interest income recognized 159 11 465 48  
With No Related Allowance Recorded | Commercial Loans | Energy-Related          
Financing Receivable, Impaired          
Recorded investment 3,384   3,384   0
Unpaid principal balance 3,384   3,384   0
Related allowance 0   0   0
Average recorded investment 3,409 0 3,425 0  
Interest income recognized 0 0 0 0  
With No Related Allowance Recorded | Consumer and Other Loans | Consumer - Home Equity          
Financing Receivable, Impaired          
Recorded investment 214   214   682
Unpaid principal balance 214   214   682
Related allowance 0   0   0
Average recorded investment 215 692 204 700  
Interest income recognized 3 0 4 14  
With An Allowance Recorded | Commercial Loans | Real Estate          
Financing Receivable, Impaired          
Recorded investment 10,681   10,681   1,044
Unpaid principal balance 11,566   11,566   1,069
Related allowance (885)   (885)   (25)
Average recorded investment 11,649 1,631 8,247 1,533  
Interest income recognized 128 0 385 91  
With An Allowance Recorded | Commercial Loans | Commercial and Industrial          
Financing Receivable, Impaired          
Recorded investment 1,009   1,009   1,209
Unpaid principal balance 1,829   1,829   1,617
Related allowance (820)   (820)   (408)
Average recorded investment 2,121 312 2,634 584  
Interest income recognized 0 0 0 9  
With An Allowance Recorded | Commercial Loans | Energy-Related          
Financing Receivable, Impaired          
Recorded investment 91   91   27
Unpaid principal balance 94   94   27
Related allowance (3)   (3)   0
Average recorded investment 99 0 106 0  
Interest income recognized 0 0 0 0  
With An Allowance Recorded | Consumer and Other Loans | Consumer - Home Equity          
Financing Receivable, Impaired          
Recorded investment 5,248   5,248   7,121
Unpaid principal balance 5,278   5,278   7,165
Related allowance (30)   (30)   (44)
Average recorded investment 5,344 7,177 5,462 7,404  
Interest income recognized 0 5 0 40  
With An Allowance Recorded | Consumer and Other Loans | Consumer - Indirect Automobile          
Financing Receivable, Impaired          
Recorded investment 1,120   1,120   1,410
Unpaid principal balance 1,129   1,129   1,419
Related allowance (9)   (9)   (9)
Average recorded investment 1,361 1,544 1,551 1,720  
Interest income recognized 0 0 0 27  
With An Allowance Recorded | Consumer and Other Loans | Consumer - Credit Card          
Financing Receivable, Impaired          
Recorded investment 329   329   1,012
Unpaid principal balance 335   335   1,032
Related allowance (6)   (6)   (20)
Average recorded investment 721 1,051 1,038 724  
Interest income recognized 0 0 0 0  
With An Allowance Recorded | Consumer and Other Loans | Consumer - Other          
Financing Receivable, Impaired          
Recorded investment 895   895   781
Unpaid principal balance 920   920   790
Related allowance (25)   (25)   (9)
Average recorded investment 1,030 470 1,068 489  
Interest income recognized 0 0 0 11  
With An Allowance Recorded | Residential Mortgage | Residential Mortgage          
Financing Receivable, Impaired          
Recorded investment 14,808   14,808   14,111
Unpaid principal balance 14,879   14,879   14,363
Related allowance (71)   (71)   $ (252)
Average recorded investment 15,008 17,305 15,100 16,341  
Interest income recognized $ 0 $ 0 $ 0 $ 119