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Loans - Schedule of Aging of Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable      
Acquired Impaired Loans $ 306,426 $ 67,987 $ 14,036
Total Loans $ 15,064,971 14,098,211  
Past due loans threshold period 120 days    
Commercial Loans      
Accounts, Notes, Loans and Financing Receivable      
Acquired Impaired Loans $ 284,409 63,132 13,271
Past due loans threshold period 90 days    
Residential Mortgage      
Accounts, Notes, Loans and Financing Receivable      
Acquired Impaired Loans $ 4,627 70 0
Consumer and Other Loans      
Accounts, Notes, Loans and Financing Receivable      
Acquired Impaired Loans 17,390 4,785 $ 765
Acquired Loans      
Accounts, Notes, Loans and Financing Receivable      
Accruing 4,249 5,357  
Non-accrual Loans 6,958 5,421  
Discount/Premium (12,811) (23,856)  
Acquired Impaired Loans 530,186 724,719  
Total Loans 2,370,047 3,136,908  
Acquired Loans | Commercial Loans      
Accounts, Notes, Loans and Financing Receivable      
Total Loans 1,529,182 2,065,514  
Acquired Loans | Commercial Loans | Commercial real estate - Construction      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 297  
Non-accrual Loans 1,946 0  
Discount/Premium (243) (358)  
Acquired Impaired Loans 32,991 56,320  
Total Loans 61,408 125,426  
Acquired Loans | Commercial Loans | Commercial real estate - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 803 1,566  
Non-accrual Loans 1,221 1,491  
Discount/Premium (3,649) (4,479)  
Acquired Impaired Loans 247,677 354,757  
Total Loans 1,117,544 1,444,023  
Acquired Loans | Commercial Loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable      
Accruing 124 623  
Non-accrual Loans 1,317 1,154  
Discount/Premium (837) (2,517)  
Acquired Impaired Loans 32,732 50,762  
Total Loans 348,326 492,476  
Acquired Loans | Commercial Loans | Energy-related      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
Non-accrual Loans 0 170  
Discount/Premium (6) 2  
Acquired Impaired Loans 0 1,231  
Total Loans 1,904 3,589  
Acquired Loans | Residential Mortgage | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,317 947  
Non-accrual Loans 719 1,109  
Discount/Premium (1,835) (6,601)  
Acquired Impaired Loans 122,952 140,580  
Total Loans 413,184 501,296  
Acquired Loans | Consumer and Other Loans | Consumer - Home equity      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,517 1,329  
Non-accrual Loans 1,395 1,291  
Discount/Premium (5,237) (7,333)  
Acquired Impaired Loans 88,419 114,130  
Total Loans 372,505 490,524  
Acquired Loans | Consumer and Other Loans | Consumer - Indirect automobile      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
Non-accrual Loans 0 0  
Discount/Premium 0 0  
Acquired Impaired Loans 4 65  
Total Loans 4 84  
Acquired Loans | Consumer and Other Loans | Consumer - Credit card      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
Non-accrual Loans 0 0  
Discount/Premium 0 0  
Acquired Impaired Loans 0 582  
Total Loans 468 582  
Acquired Loans | Consumer and Other Loans | Consumer - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 488 595  
Non-accrual Loans 360 206  
Discount/Premium (1,004) (2,570)  
Acquired Impaired Loans 5,411 6,292  
Total Loans 54,704 78,908  
Legacy Loans      
Accounts, Notes, Loans and Financing Receivable      
Accruing 26,006 20,733  
Non-accrual Loans 221,543 50,928  
Total Loans 12,694,924 11,190,520  
Legacy Loans | Commercial Loans      
Accounts, Notes, Loans and Financing Receivable      
Total Loans 9,377,399 8,133,341  
Legacy Loans | Commercial Loans | Commercial real estate - Construction      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 801  
Non-accrual Loans 0 120  
Total Loans 740,761 636,481  
Legacy Loans | Commercial Loans | Commercial real estate - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 2,212 3,575  
Non-accrual Loans 16,439 15,422  
Total Loans 4,882,553 3,867,581  
Legacy Loans | Commercial Loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable      
Accruing 4,869 2,034  
Non-accrual Loans 31,227 6,659  
Total Loans 3,194,796 2,952,102  
Legacy Loans | Commercial Loans | Energy-related      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,526 15  
Non-accrual Loans 150,329 7,081  
Total Loans 559,289 677,177  
Legacy Loans | Residential Mortgage | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable      
Accruing 4,693 4,002  
Non-accrual Loans 13,014 13,674  
Total Loans 854,216 694,023  
Legacy Loans | Consumer and Other Loans | Consumer - Home equity      
Accounts, Notes, Loans and Financing Receivable      
Accruing 6,679 4,419  
Non-accrual Loans 7,979 5,628  
Total Loans 1,783,421 1,575,643  
Legacy Loans | Consumer and Other Loans | Consumer - Indirect automobile      
Accounts, Notes, Loans and Financing Receivable      
Accruing 2,956 2,705  
Non-accrual Loans 1,038 1,181  
Total Loans 131,048 246,214  
Legacy Loans | Consumer and Other Loans | Consumer - Credit card      
Accounts, Notes, Loans and Financing Receivable      
Accruing 298 507  
Non-accrual Loans 624 394  
Total Loans 82,524 77,261  
Legacy Loans | Consumer and Other Loans | Consumer - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 2,773 2,675  
Non-accrual Loans 893 769  
Total Loans 466,316 464,038  
Current or Less Than 30 days past due | Acquired Loans      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,841,465 2,425,267  
Current or Less Than 30 days past due | Acquired Loans | Commercial Loans | Commercial real estate - Construction      
Accounts, Notes, Loans and Financing Receivable      
Accruing 26,714 69,167  
Current or Less Than 30 days past due | Acquired Loans | Commercial Loans | Commercial real estate - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 871,492 1,090,688  
Current or Less Than 30 days past due | Acquired Loans | Commercial Loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable      
Accruing 314,990 442,454  
Current or Less Than 30 days past due | Acquired Loans | Commercial Loans | Energy-related      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,910 2,186  
Current or Less Than 30 days past due | Acquired Loans | Residential Mortgage | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable      
Accruing 290,031 365,261  
Current or Less Than 30 days past due | Acquired Loans | Consumer and Other Loans | Consumer - Home equity      
Accounts, Notes, Loans and Financing Receivable      
Accruing 286,411 381,107  
Current or Less Than 30 days past due | Acquired Loans | Consumer and Other Loans | Consumer - Indirect automobile      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 19  
Current or Less Than 30 days past due | Acquired Loans | Consumer and Other Loans | Consumer - Credit card      
Accounts, Notes, Loans and Financing Receivable      
Accruing 468 0  
Current or Less Than 30 days past due | Acquired Loans | Consumer and Other Loans | Consumer - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 49,449 74,385  
Current or Less Than 30 days past due | Legacy Loans      
Accounts, Notes, Loans and Financing Receivable      
Accruing 12,447,375 11,118,859  
Current or Less Than 30 days past due | Legacy Loans | Commercial Loans | Commercial real estate - Construction      
Accounts, Notes, Loans and Financing Receivable      
Accruing 740,761 635,560  
Current or Less Than 30 days past due | Legacy Loans | Commercial Loans | Commercial real estate - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 4,863,902 3,848,584  
Current or Less Than 30 days past due | Legacy Loans | Commercial Loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable      
Accruing 3,158,700 2,943,409  
Current or Less Than 30 days past due | Legacy Loans | Commercial Loans | Energy-related      
Accounts, Notes, Loans and Financing Receivable      
Accruing 407,434 670,081  
Current or Less Than 30 days past due | Legacy Loans | Residential Mortgage | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable      
Accruing 836,509 676,347  
Current or Less Than 30 days past due | Legacy Loans | Consumer and Other Loans | Consumer - Home equity      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,768,763 1,565,596  
Current or Less Than 30 days past due | Legacy Loans | Consumer and Other Loans | Consumer - Indirect automobile      
Accounts, Notes, Loans and Financing Receivable      
Accruing 127,054 242,328  
Current or Less Than 30 days past due | Legacy Loans | Consumer and Other Loans | Consumer - Credit card      
Accounts, Notes, Loans and Financing Receivable      
Accruing 81,602 76,360  
Current or Less Than 30 days past due | Legacy Loans | Consumer and Other Loans | Consumer - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 462,650 460,594  
30-59 days | Acquired Loans      
Accounts, Notes, Loans and Financing Receivable      
Accruing 2,586 2,761  
30-59 days | Acquired Loans | Commercial Loans | Commercial real estate - Construction      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 180  
30-59 days | Acquired Loans | Commercial Loans | Commercial real estate - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 716 861  
30-59 days | Acquired Loans | Commercial Loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable      
Accruing 73 623  
30-59 days | Acquired Loans | Commercial Loans | Energy-related      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
30-59 days | Acquired Loans | Residential Mortgage | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable      
Accruing 328 7  
30-59 days | Acquired Loans | Consumer and Other Loans | Consumer - Home equity      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,078 622  
30-59 days | Acquired Loans | Consumer and Other Loans | Consumer - Indirect automobile      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
30-59 days | Acquired Loans | Consumer and Other Loans | Consumer - Credit card      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
30-59 days | Acquired Loans | Consumer and Other Loans | Consumer - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 391 468  
30-59 days | Legacy Loans      
Accounts, Notes, Loans and Financing Receivable      
Accruing 18,026 13,839  
30-59 days | Legacy Loans | Commercial Loans | Commercial real estate - Construction      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 801  
30-59 days | Legacy Loans | Commercial Loans | Commercial real estate - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,861 2,687  
30-59 days | Legacy Loans | Commercial Loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable      
Accruing 3,999 1,208  
30-59 days | Legacy Loans | Commercial Loans | Energy-related      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 15  
30-59 days | Legacy Loans | Residential Mortgage | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable      
Accruing 2,012 1,075  
30-59 days | Legacy Loans | Consumer and Other Loans | Consumer - Home equity      
Accounts, Notes, Loans and Financing Receivable      
Accruing 5,249 3,549  
30-59 days | Legacy Loans | Consumer and Other Loans | Consumer - Indirect automobile      
Accounts, Notes, Loans and Financing Receivable      
Accruing 2,551 2,187  
30-59 days | Legacy Loans | Consumer and Other Loans | Consumer - Credit card      
Accounts, Notes, Loans and Financing Receivable      
Accruing 199 394  
30-59 days | Legacy Loans | Consumer and Other Loans | Consumer - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 2,155 1,923  
60-89 days | Acquired Loans      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,381 2,305  
60-89 days | Acquired Loans | Commercial Loans | Commercial real estate - Construction      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 117  
60-89 days | Acquired Loans | Commercial Loans | Commercial real estate - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 55 705  
60-89 days | Acquired Loans | Commercial Loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable      
Accruing 51 0  
60-89 days | Acquired Loans | Commercial Loans | Energy-related      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
60-89 days | Acquired Loans | Residential Mortgage | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable      
Accruing 989 940  
60-89 days | Acquired Loans | Consumer and Other Loans | Consumer - Home equity      
Accounts, Notes, Loans and Financing Receivable      
Accruing 189 416  
60-89 days | Acquired Loans | Consumer and Other Loans | Consumer - Indirect automobile      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
60-89 days | Acquired Loans | Consumer and Other Loans | Consumer - Credit card      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
60-89 days | Acquired Loans | Consumer and Other Loans | Consumer - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 97 127  
60-89 days | Legacy Loans      
Accounts, Notes, Loans and Financing Receivable      
Accruing 6,876 6,270  
60-89 days | Legacy Loans | Commercial Loans | Commercial real estate - Construction      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
60-89 days | Legacy Loans | Commercial Loans | Commercial real estate - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 351 793  
60-89 days | Legacy Loans | Commercial Loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable      
Accruing 870 739  
60-89 days | Legacy Loans | Commercial Loans | Energy-related      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,526 0  
60-89 days | Legacy Loans | Residential Mortgage | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,577 2,485  
60-89 days | Legacy Loans | Consumer and Other Loans | Consumer - Home equity      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,430 870  
60-89 days | Legacy Loans | Consumer and Other Loans | Consumer - Indirect automobile      
Accounts, Notes, Loans and Financing Receivable      
Accruing 405 518  
60-89 days | Legacy Loans | Consumer and Other Loans | Consumer - Credit card      
Accounts, Notes, Loans and Financing Receivable      
Accruing 99 113  
60-89 days | Legacy Loans | Consumer and Other Loans | Consumer - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 618 752  
Greater than 90 days | Acquired Loans      
Accounts, Notes, Loans and Financing Receivable      
Accruing 282 291  
Greater than 90 days | Acquired Loans | Commercial Loans | Commercial real estate - Construction      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
Greater than 90 days | Acquired Loans | Commercial Loans | Commercial real estate - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 32 0  
Greater than 90 days | Acquired Loans | Commercial Loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
Greater than 90 days | Acquired Loans | Commercial Loans | Energy-related      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
Greater than 90 days | Acquired Loans | Residential Mortgage | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
Greater than 90 days | Acquired Loans | Consumer and Other Loans | Consumer - Home equity      
Accounts, Notes, Loans and Financing Receivable      
Accruing 250 291  
Greater than 90 days | Acquired Loans | Consumer and Other Loans | Consumer - Indirect automobile      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
Greater than 90 days | Acquired Loans | Consumer and Other Loans | Consumer - Credit card      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
Greater than 90 days | Acquired Loans | Consumer and Other Loans | Consumer - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
Greater than 90 days | Legacy Loans      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,104 624  
Greater than 90 days | Legacy Loans | Commercial Loans | Commercial real estate - Construction      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
Greater than 90 days | Legacy Loans | Commercial Loans | Commercial real estate - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 95  
Greater than 90 days | Legacy Loans | Commercial Loans | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 87  
Greater than 90 days | Legacy Loans | Commercial Loans | Energy-related      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
Greater than 90 days | Legacy Loans | Residential Mortgage | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable      
Accruing 1,104 442  
Greater than 90 days | Legacy Loans | Consumer and Other Loans | Consumer - Home equity      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
Greater than 90 days | Legacy Loans | Consumer and Other Loans | Consumer - Indirect automobile      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
Greater than 90 days | Legacy Loans | Consumer and Other Loans | Consumer - Credit card      
Accounts, Notes, Loans and Financing Receivable      
Accruing 0 0  
Greater than 90 days | Legacy Loans | Consumer and Other Loans | Consumer - Other      
Accounts, Notes, Loans and Financing Receivable      
Accruing $ 0 $ 0