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Allowance for Credit Losses and Credit Quality - Schedule of Investment in Legacy Impaired Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Impaired      
Recorded investment $ 85,393 $ 36,560 $ 45,342
Unpaid principal balance 89,516 37,327 46,501
Related allowance (4,123) (767) (1,159)
Average recorded investment 96,221 39,176 49,645
Interest income recognized 3,145 513 587
Commercial Loans      
Financing Receivable, Impaired      
Recorded investment 60,289 11,443 25,018
Unpaid principal balance 63,944 11,876 25,877
Related allowance (3,655) (433) (859)
Average recorded investment 70,449 12,851 28,823
Interest income recognized 2,819 251 321
Residential Mortgage      
Financing Receivable, Impaired      
Recorded investment 13,679 14,111 11,408
Unpaid principal balance 13,743 14,363 11,645
Related allowance (64) (252) (237)
Average recorded investment 14,086 14,263 9,675
Interest income recognized 87 110 98
Consumer and Other Loans      
Financing Receivable, Impaired      
Recorded investment 11,425 11,006 8,916
Unpaid principal balance 11,829 11,088 8,979
Related allowance (404) (82) (63)
Average recorded investment 11,686 12,062 11,147
Interest income recognized 244 152 168
With No Related Allowance Recorded | Commercial Loans | Real Estate      
Financing Receivable, Impaired      
Recorded investment 16,145 6,680 8,567
Unpaid principal balance 16,145 6,680 8,567
Related allowance 0 0 0
Average recorded investment 15,864 6,703 10,443
Interest income recognized 315 132 43
With No Related Allowance Recorded | Commercial Loans | Commercial and Industrial      
Financing Receivable, Impaired      
Recorded investment 14,340 2,483 13,256
Unpaid principal balance 14,340 2,483 13,256
Related allowance 0 0 0
Average recorded investment 18,839 2,873 11,074
Interest income recognized 1,148 57 170
With No Related Allowance Recorded | Commercial Loans | Energy-Related      
Financing Receivable, Impaired      
Recorded investment 0    
Unpaid principal balance 0    
Related allowance 0    
Average recorded investment 0    
Interest income recognized 0    
With No Related Allowance Recorded | Consumer and Other Loans | Consumer - Home Equity      
Financing Receivable, Impaired      
Recorded investment 730 682 258
Unpaid principal balance 730 682 258
Related allowance 0 0 0
Average recorded investment 533 696 281
Interest income recognized 22 19 1
With No Related Allowance Recorded | Consumer and Other Loans | Consumer - Other      
Financing Receivable, Impaired      
Recorded investment 66    
Unpaid principal balance 66    
Related allowance 0    
Average recorded investment 66    
Interest income recognized 5    
With An Allowance Recorded | Commercial Loans | Real Estate      
Financing Receivable, Impaired      
Recorded investment 12,500 1,044 1,268
Unpaid principal balance 13,753 1,069 1,284
Related allowance (1,253) (25) (16)
Average recorded investment 14,055 1,134 4,414
Interest income recognized 554 38 8
With An Allowance Recorded | Commercial Loans | Commercial and Industrial      
Financing Receivable, Impaired      
Recorded investment 5,985 1,209 1,927
Unpaid principal balance 6,262 1,617 2,770
Related allowance (277) (408) (843)
Average recorded investment 7,352 2,113 2,892
Interest income recognized 331 23 100
With An Allowance Recorded | Commercial Loans | Energy-Related      
Financing Receivable, Impaired      
Recorded investment 11,319 27  
Unpaid principal balance 13,444 27  
Related allowance (2,125) 0  
Average recorded investment 14,339 28  
Interest income recognized 471 1  
With An Allowance Recorded | Residential Mortgage | Residential Mortgage      
Financing Receivable, Impaired      
Recorded investment 13,679 14,111 11,408
Unpaid principal balance 13,743 14,363 11,645
Related allowance (64) (252) (237)
Average recorded investment 14,086 14,263 9,675
Interest income recognized 82 110 98
With An Allowance Recorded | Consumer and Other Loans | Consumer - Home Equity      
Financing Receivable, Impaired      
Recorded investment 8,196 7,121 6,506
Unpaid principal balance 8,559 7,165 6,550
Related allowance (363) (44) (44)
Average recorded investment 7,554 7,544 7,593
Interest income recognized 129 43 93
With An Allowance Recorded | Consumer and Other Loans | Consumer - Indirect Automobile      
Financing Receivable, Impaired      
Recorded investment 1,171 1,410 1,267
Unpaid principal balance 1,181 1,419 1,275
Related allowance (10) (9) (8)
Average recorded investment 1,613 2,016 2,090
Interest income recognized 44 51 55
With An Allowance Recorded | Consumer and Other Loans | Consumer - Credit Card      
Financing Receivable, Impaired      
Recorded investment 386 1,012 404
Unpaid principal balance 394 1,032 411
Related allowance (8) (20) (7)
Average recorded investment 881 797 418
Interest income recognized 0 0 0
With An Allowance Recorded | Consumer and Other Loans | Consumer - Other      
Financing Receivable, Impaired      
Recorded investment 876 781 481
Unpaid principal balance 899 790 485
Related allowance (23) (9) (4)
Average recorded investment 1,039 1,009 765
Interest income recognized $ 44 $ 39 $ 19