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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired      
Acquired Impaired Loans $ 306,426 $ 67,987 $ 14,036
Unpaid principal balance 292,645 66,641 11,700
Related allowance (22,776) (3,993) (430)
Average recorded investment 261,850 70,714 12,246
Interest income recognized 8,680 2,868 239
Commercial Loans      
Financing Receivable, Impaired      
Acquired Impaired Loans 284,409 63,132 13,271
Unpaid principal balance 271,876 61,963 11,001
Related allowance (21,274) (3,640) (427)
Average recorded investment 244,821 67,562 11,532
Interest income recognized 7,934 2,760 218
Residential Mortgage      
Financing Receivable, Impaired      
Acquired Impaired Loans 4,627 70 0
Unpaid principal balance 4,312 70 0
Related allowance (144) (1) 0
Average recorded investment 4,377 70 0
Interest income recognized 161 5 0
Consumer and Other Loans      
Financing Receivable, Impaired      
Acquired Impaired Loans 17,390 4,785 765
Unpaid principal balance 16,457 4,608 699
Related allowance (1,358) (352) (3)
Average recorded investment 12,652 3,082 714
Interest income recognized 585 103 21
With No Related Allowance Recorded | Commercial Loans | Real Estate      
Financing Receivable, Impaired      
Acquired Impaired Loans 17,299 17,002 7,615
Unpaid principal balance 16,507 16,145 6,680
Average recorded investment 21,133 15,864 6,703
Interest income recognized 948 315 132
With No Related Allowance Recorded | Commercial Loans | Commercial and industrial      
Financing Receivable, Impaired      
Acquired Impaired Loans 14,202 14,571 3,710
Unpaid principal balance 13,189 14,340 2,483
Average recorded investment 15,492 18,839 2,602
Interest income recognized 805 1,148 39
With No Related Allowance Recorded | Commercial Loans | Energy-related      
Financing Receivable, Impaired      
Acquired Impaired Loans 152,424 0  
Unpaid principal balance 143,239 0  
Average recorded investment 114,623 0  
Interest income recognized 2,903 0  
With No Related Allowance Recorded | Consumer and Other Loans | Consumer - Home equity      
Financing Receivable, Impaired      
Acquired Impaired Loans 0 730 748
Unpaid principal balance 0 730 682
Average recorded investment 0 533 696
Interest income recognized 0 22 19
With No Related Allowance Recorded | Consumer and Other Loans | Consumer - Other      
Financing Receivable, Impaired      
Acquired Impaired Loans 0 66  
Unpaid principal balance 0 66  
Average recorded investment 0 66  
Interest income recognized 0 5  
With An Allowance Recorded | Commercial Loans | Real Estate      
Financing Receivable, Impaired      
Acquired Impaired Loans 17,688 12,765 356
Unpaid principal balance 17,524 12,712 356
Related allowance (641) (1,246) (20)
Average recorded investment 16,771 12,985 378
Interest income recognized 494 530 23
With An Allowance Recorded | Commercial Loans | Commercial and industrial      
Financing Receivable, Impaired      
Acquired Impaired Loans 28,829 5,748 1,590
Unpaid principal balance 28,329 5,746 1,482
Related allowance (10,864) (272) (407)
Average recorded investment 29,333 5,975 1,849
Interest income recognized 1,107 313 24
With An Allowance Recorded | Commercial Loans | Energy-related      
Financing Receivable, Impaired      
Acquired Impaired Loans 53,967 13,046  
Unpaid principal balance 53,088 13,020  
Related allowance (9,769) (2,122)  
Average recorded investment 47,469 13,899  
Interest income recognized 1,677 454  
With An Allowance Recorded | Residential Mortgage | Residential mortgage      
Financing Receivable, Impaired      
Acquired Impaired Loans 4,627 70  
Unpaid principal balance 4,312 70  
Related allowance (144) (1)  
Average recorded investment 4,377 70  
Interest income recognized 161 5  
With An Allowance Recorded | Consumer and Other Loans | Consumer - Home equity      
Financing Receivable, Impaired      
Acquired Impaired Loans 13,906 3,859  
Unpaid principal balance 13,257 3,683  
Related allowance (993) (337)  
Average recorded investment 10,227 2,453  
Interest income recognized 434 73  
With An Allowance Recorded | Consumer and Other Loans | Consumer - Indirect Automobile      
Financing Receivable, Impaired      
Acquired Impaired Loans 1,037    
Unpaid principal balance 758    
Related allowance (114)    
Average recorded investment 956    
Interest income recognized 49    
With An Allowance Recorded | Consumer and Other Loans | Consumer - Other      
Financing Receivable, Impaired      
Acquired Impaired Loans 2,447 130 17
Unpaid principal balance 2,442 129 17
Related allowance (251) (15) (3)
Average recorded investment 1,469 30 18
Interest income recognized $ 102 $ 3 $ 2