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Loans - Schedule of Aging of Non-Covered Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable    
Discount/Premium $ 19,100 $ 18,700
Total Acquired Loans, Net of Unearned Income $ 14,230,752 14,098,211
Past due loans threshold period 90 days  
Legacy Loans    
Accounts, Notes, Loans and Financing Receivable    
Total past due $ 136,008 71,661
Current 11,392,689 11,118,859
Total Acquired Loans, Net of Unearned Income 11,528,697 11,190,520
Recorded Investment 90 days and Accruing 125 624
Legacy Loans | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 37,585 13,839
Legacy Loans | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 4,869 6,270
Legacy Loans | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 93,554 51,552
Legacy Loans | Commercial Loans    
Accounts, Notes, Loans and Financing Receivable    
Total Acquired Loans, Net of Unearned Income 8,427,154 8,133,341
Legacy Loans | Commercial Loans | Commercial Real Estate - Construction    
Accounts, Notes, Loans and Financing Receivable    
Total past due 10,790 921
Current 603,181 635,560
Total Acquired Loans, Net of Unearned Income 613,971 636,481
Recorded Investment 90 days and Accruing 0 0
Legacy Loans | Commercial Loans | Commercial Real Estate - Construction | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 10,748 801
Legacy Loans | Commercial Loans | Commercial Real Estate - Construction | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 0 0
Legacy Loans | Commercial Loans | Commercial Real Estate - Construction | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 42 120
Legacy Loans | Commercial Loans | Commercial Real Estate - Other    
Accounts, Notes, Loans and Financing Receivable    
Total past due 25,420 18,997
Current 4,132,299 3,848,584
Total Acquired Loans, Net of Unearned Income 4,157,719 3,867,581
Recorded Investment 90 days and Accruing 21 95
Legacy Loans | Commercial Loans | Commercial Real Estate - Other | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 10,875 2,687
Legacy Loans | Commercial Loans | Commercial Real Estate - Other | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 859 793
Legacy Loans | Commercial Loans | Commercial Real Estate - Other | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 13,686 15,517
Legacy Loans | Commercial Loans | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable    
Total past due 18,355 8,693
Current 2,908,331 2,943,409
Total Acquired Loans, Net of Unearned Income 2,926,686 2,952,102
Recorded Investment 90 days and Accruing 0 87
Legacy Loans | Commercial Loans | Commercial and Industrial | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 4,241 1,208
Legacy Loans | Commercial Loans | Commercial and Industrial | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 1,576 739
Legacy Loans | Commercial Loans | Commercial and Industrial | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 12,538 6,746
Legacy Loans | Commercial Loans | Energy-Related    
Accounts, Notes, Loans and Financing Receivable    
Total past due 46,151 7,096
Current 682,627 670,081
Total Acquired Loans, Net of Unearned Income 728,778 677,177
Recorded Investment 90 days and Accruing 0 0
Legacy Loans | Commercial Loans | Energy-Related | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 0 15
Legacy Loans | Commercial Loans | Energy-Related | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 0 0
Legacy Loans | Commercial Loans | Energy-Related | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 46,151 7,081
Legacy Loans | Residential Mortgage Loans | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable    
Total past due 17,201 17,676
Current 713,420 676,347
Total Acquired Loans, Net of Unearned Income 730,621 694,023
Recorded Investment 90 days and Accruing 104 442
Legacy Loans | Residential Mortgage Loans | Residential Mortgage | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 2,890 1,075
Legacy Loans | Residential Mortgage Loans | Residential Mortgage | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 1,254 2,485
Legacy Loans | Residential Mortgage Loans | Residential Mortgage | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 13,057 14,116
Legacy Loans | Consumer - Other | Consumer - Home Equity    
Accounts, Notes, Loans and Financing Receivable    
Total past due 10,585 10,047
Current 1,615,227 1,565,596
Total Acquired Loans, Net of Unearned Income 1,625,812 1,575,643
Recorded Investment 90 days and Accruing 0 0
Legacy Loans | Consumer - Other | Consumer - Home Equity | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 4,484 3,549
Legacy Loans | Consumer - Other | Consumer - Home Equity | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 362 870
Legacy Loans | Consumer - Other | Consumer - Home Equity | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 5,739 5,628
Legacy Loans | Consumer - Other | Consumer - Indirect Automobile    
Accounts, Notes, Loans and Financing Receivable    
Total past due 3,327 3,886
Current 209,814 242,328
Total Acquired Loans, Net of Unearned Income 213,141 246,214
Recorded Investment 90 days and Accruing 0 0
Legacy Loans | Consumer - Other | Consumer - Indirect Automobile | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 1,918 2,187
Legacy Loans | Consumer - Other | Consumer - Indirect Automobile | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 264 518
Legacy Loans | Consumer - Other | Consumer - Indirect Automobile | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 1,145 1,181
Legacy Loans | Consumer - Other | Consumer - Credit Card    
Accounts, Notes, Loans and Financing Receivable    
Total past due 733 901
Current 75,514 76,360
Total Acquired Loans, Net of Unearned Income 76,247 77,261
Recorded Investment 90 days and Accruing 0 0
Legacy Loans | Consumer - Other | Consumer - Credit Card | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 209 394
Legacy Loans | Consumer - Other | Consumer - Credit Card | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 56 113
Legacy Loans | Consumer - Other | Consumer - Credit Card | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 468 394
Legacy Loans | Consumer - Other | Consumer - Other    
Accounts, Notes, Loans and Financing Receivable    
Total past due 3,446 3,444
Current 452,276 460,594
Total Acquired Loans, Net of Unearned Income 455,722 464,038
Recorded Investment 90 days and Accruing 0 0
Legacy Loans | Consumer - Other | Consumer - Other | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 2,220 1,923
Legacy Loans | Consumer - Other | Consumer - Other | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 498 752
Legacy Loans | Consumer - Other | Consumer - Other | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 728 769
Acquired Loans    
Accounts, Notes, Loans and Financing Receivable    
Total past due 106,890 120,313
Current 2,935,609 3,137,451
Discount/Premium (119,952) (120,856)
Total Acquired Loans, Net of Unearned Income 2,922,547 3,136,908
Recorded Investment 90 days and Accruing 85,111 99,422
Acquired Loans | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 13,645 9,039
Acquired Loans | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 2,974 6,431
Acquired Loans | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 90,271 104,843
Acquired Loans | Commercial Loans    
Accounts, Notes, Loans and Financing Receivable    
Total Acquired Loans, Net of Unearned Income 1,909,518 2,065,514
Acquired Loans | Commercial Loans | Commercial Real Estate - Construction    
Accounts, Notes, Loans and Financing Receivable    
Total past due 7,382 7,327
Current 104,280 120,467
Discount/Premium 14,943 (2,368)
Total Acquired Loans, Net of Unearned Income 126,605 125,426
Recorded Investment 90 days and Accruing 6,590 6,994
Acquired Loans | Commercial Loans | Commercial Real Estate - Construction | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 602 216
Acquired Loans | Commercial Loans | Commercial Real Estate - Construction | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 9 117
Acquired Loans | Commercial Loans | Commercial Real Estate - Construction | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 6,771 6,994
Acquired Loans | Commercial Loans | Commercial Real Estate - Other    
Accounts, Notes, Loans and Financing Receivable    
Total past due 53,081 59,877
Current 1,349,646 1,434,966
Discount/Premium (70,394) (50,820)
Total Acquired Loans, Net of Unearned Income 1,332,333 1,444,023
Recorded Investment 90 days and Accruing 42,397 52,067
Acquired Loans | Commercial Loans | Commercial Real Estate - Other | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 7,726 4,295
Acquired Loans | Commercial Loans | Commercial Real Estate - Other | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 1,353 2,024
Acquired Loans | Commercial Loans | Commercial Real Estate - Other | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 44,002 53,558
Acquired Loans | Commercial Loans | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable    
Total past due 8,321 9,121
Current 443,954 490,255
Discount/Premium (4,579) (6,900)
Total Acquired Loans, Net of Unearned Income 447,696 492,476
Recorded Investment 90 days and Accruing 5,069 5,674
Acquired Loans | Commercial Loans | Commercial and Industrial | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 1,382 1,016
Acquired Loans | Commercial Loans | Commercial and Industrial | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 806 1,276
Acquired Loans | Commercial Loans | Commercial and Industrial | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 6,133 6,829
Acquired Loans | Commercial Loans | Energy-Related    
Accounts, Notes, Loans and Financing Receivable    
Total past due 81 1,368
Current 2,803 2,221
Discount/Premium 0 0
Total Acquired Loans, Net of Unearned Income 2,884 3,589
Recorded Investment 90 days and Accruing 81 1,198
Acquired Loans | Commercial Loans | Energy-Related | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 0 0
Acquired Loans | Commercial Loans | Energy-Related | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 0 0
Acquired Loans | Commercial Loans | Energy-Related | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 81 1,368
Acquired Loans | Residential Mortgage Loans | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable    
Total past due 22,430 24,752
Current 486,566 506,103
Discount/Premium (31,226) (29,559)
Total Acquired Loans, Net of Unearned Income 477,770 501,296
Recorded Investment 90 days and Accruing 20,817 21,765
Acquired Loans | Residential Mortgage Loans | Residential Mortgage | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 766 73
Acquired Loans | Residential Mortgage Loans | Residential Mortgage | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 0 1,806
Acquired Loans | Residential Mortgage Loans | Residential Mortgage | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 21,664 22,873
Acquired Loans | Consumer - Other | Consumer - Home Equity    
Accounts, Notes, Loans and Financing Receivable    
Total past due 14,381 16,381
Current 478,837 503,635
Discount/Premium (27,516) (29,492)
Total Acquired Loans, Net of Unearned Income 465,702 490,524
Recorded Investment 90 days and Accruing 9,725 11,234
Acquired Loans | Consumer - Other | Consumer - Home Equity | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 2,682 2,859
Acquired Loans | Consumer - Other | Consumer - Home Equity | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 707 997
Acquired Loans | Consumer - Other | Consumer - Home Equity | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 10,992 12,525
Acquired Loans | Consumer - Other | Consumer - Indirect Automobile    
Accounts, Notes, Loans and Financing Receivable    
Total past due 5 12
Current 66 72
Discount/Premium (33) 0
Total Acquired Loans, Net of Unearned Income 38 84
Recorded Investment 90 days and Accruing 4 12
Acquired Loans | Consumer - Other | Consumer - Indirect Automobile | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 0 0
Acquired Loans | Consumer - Other | Consumer - Indirect Automobile | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 1 0
Acquired Loans | Consumer - Other | Consumer - Indirect Automobile | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 4 12
Acquired Loans | Consumer - Other | Consumer - Credit Card    
Accounts, Notes, Loans and Financing Receivable    
Total past due 23 17
Current 486 565
Discount/Premium 0 0
Total Acquired Loans, Net of Unearned Income 509 582
Recorded Investment 90 days and Accruing 17 17
Acquired Loans | Consumer - Other | Consumer - Credit Card | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 6 0
Acquired Loans | Consumer - Other | Consumer - Credit Card | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 0 0
Acquired Loans | Consumer - Other | Consumer - Credit Card | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 17 17
Acquired Loans | Consumer - Other | Consumer - Other    
Accounts, Notes, Loans and Financing Receivable    
Total past due 1,186 1,458
Current 68,971 79,167
Discount/Premium (1,147) (1,717)
Total Acquired Loans, Net of Unearned Income 69,010 78,908
Recorded Investment 90 days and Accruing 411 461
Acquired Loans | Consumer - Other | Consumer - Other | 30-59 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 481 580
Acquired Loans | Consumer - Other | Consumer - Other | 60-89 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due 98 211
Acquired Loans | Consumer - Other | Consumer - Other | 90 days    
Accounts, Notes, Loans and Financing Receivable    
Total past due $ 607 $ 667