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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Financing Receivable, Impaired          
Acquired Impaired Loans $ 356,021   $ 356,021   $ 102,733
Unpaid principal balance 342,043   342,043   89,516
Related allowance (25,306)   (25,306)   (4,123)
Average recorded investment 356,776 $ 77,030 334,058 $ 75,501  
Interest income recognized 3,044 327 9,121 933  
Commercial Loans          
Financing Receivable, Impaired          
Acquired Impaired Loans 315,357   315,357   73,846
Unpaid principal balance 304,850   304,850   63,944
Related allowance (24,068)   (24,068)   (3,655)
Average recorded investment 320,919 53,351 299,334 51,078  
Interest income recognized 2,822 324 8,417 929  
Residential Mortgage          
Financing Receivable, Impaired          
Acquired Impaired Loans 18,205   18,205   14,806
Unpaid principal balance 16,840   16,840   13,743
Related allowance (124)   (124)   (64)
Average recorded investment 16,558 15,008 16,410 15,100  
Interest income recognized 49 0 177 0  
Consumer          
Financing Receivable, Impaired          
Acquired Impaired Loans 22,459   22,459   14,081
Unpaid principal balance 20,353   20,353   11,829
Related allowance (1,114)   (1,114)   (404)
Average recorded investment 19,299 8,671 18,314 9,323  
Interest income recognized 173 3 527 4  
With No Related Allowance Recorded | Commercial Loans | Commercial real estate          
Financing Receivable, Impaired          
Acquired Impaired Loans 15,447   15,447   17,002
Unpaid principal balance 14,655   14,655   16,145
Average recorded investment 20,345 16,018 20,633 16,036  
Interest income recognized 220 37 663 79  
With No Related Allowance Recorded | Commercial Loans | Commercial and Industrial          
Financing Receivable, Impaired          
Acquired Impaired Loans 29,162   29,162   14,571
Unpaid principal balance 28,722   28,722   14,340
Average recorded investment 29,533 20,055 30,772 20,630  
Interest income recognized 313 159 1,030 465  
With No Related Allowance Recorded | Commercial Loans | Energy-Related          
Financing Receivable, Impaired          
Acquired Impaired Loans 168,723   168,723   0
Unpaid principal balance 163,156   163,156   0
Average recorded investment 165,459 3,409 149,099 3,425  
Interest income recognized 1,364 0 3,755 0  
With No Related Allowance Recorded | Residential Mortgage | Residential Mortgage          
Financing Receivable, Impaired          
Acquired Impaired Loans 0   0   0
Unpaid principal balance 0   0   0
Average recorded investment 0 0 0 0  
Interest income recognized 0 0 0 0  
With No Related Allowance Recorded | Consumer | Consumer - Home Equity          
Financing Receivable, Impaired          
Acquired Impaired Loans 0   0   730
Unpaid principal balance 0   0   730
Average recorded investment 0 215 0 204  
Interest income recognized 0 3 0 4  
With No Related Allowance Recorded | Consumer | Consumer - Other          
Financing Receivable, Impaired          
Acquired Impaired Loans 0   0   66
Unpaid principal balance 0   0   66
With An Allowance Recorded | Commercial Loans | Commercial real estate          
Financing Receivable, Impaired          
Acquired Impaired Loans 17,870   17,870   21,377
Unpaid principal balance 17,843   17,843   13,753
Related allowance (660)   (660)   (1,253)
Average recorded investment 17,776 11,649 17,654 8,247  
Interest income recognized 143 128 433 385  
With An Allowance Recorded | Commercial Loans | Commercial and Industrial          
Financing Receivable, Impaired          
Acquired Impaired Loans 31,406   31,406   7,422
Unpaid principal balance 31,067   31,067   6,262
Related allowance (9,012)   (9,012)   (277)
Average recorded investment 31,859 2,121 39,087 2,634  
Interest income recognized 366 0 1,211 0  
With An Allowance Recorded | Commercial Loans | Energy-Related          
Financing Receivable, Impaired          
Acquired Impaired Loans 52,749   52,749   13,474
Unpaid principal balance 49,407   49,407   13,444
Related allowance (14,396)   (14,396)   (2,125)
Average recorded investment 55,947 99 42,089 106  
Interest income recognized 416 0 1,325 0  
With An Allowance Recorded | Residential Mortgage | Residential Mortgage          
Financing Receivable, Impaired          
Acquired Impaired Loans 18,205   18,205   14,806
Unpaid principal balance 16,840   16,840   13,743
Related allowance (124)   (124)   (64)
Average recorded investment 16,558 15,008 16,410 15,100  
Interest income recognized 49 0 177 0  
With An Allowance Recorded | Consumer | Consumer - Home Equity          
Financing Receivable, Impaired          
Acquired Impaired Loans 16,845   16,845   9,486
Unpaid principal balance 15,615   15,615   8,559
Related allowance (855)   (855)   (363)
Average recorded investment 14,632 5,344 13,696 5,462  
Interest income recognized 119 0 348 0  
With An Allowance Recorded | Consumer | Consumer - Indirect Automobile          
Financing Receivable, Impaired          
Acquired Impaired Loans 2,465   2,465   1,955
Unpaid principal balance 1,727   1,727   1,181
Related allowance (128)   (128)   (10)
Average recorded investment 1,853 1,361 2,092 1,551  
Interest income recognized 16 0 70 0  
With An Allowance Recorded | Consumer | Consumer - Credit Card          
Financing Receivable, Impaired          
Acquired Impaired Loans 438   438   394
Unpaid principal balance 438   438   394
Related allowance (9)   (9)   (8)
Average recorded investment 468 721 461 1,038  
Interest income recognized 0 0 0 0  
With An Allowance Recorded | Consumer | Consumer - Other          
Financing Receivable, Impaired          
Acquired Impaired Loans 2,711   2,711   1,450
Unpaid principal balance 2,573   2,573   899
Related allowance (122)   (122)   $ (23)
Average recorded investment 2,346 1,030 2,065 1,068  
Interest income recognized $ 38 $ 0 $ 109 $ 0