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Allowance for Credit Losses and Credit Quality - Schedule of Allowance for Loan Losses for Legacy and Acquired Loans, by Loan Portfolio (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses      
Provision for Loan, Lease, and Other Losses $ 30,908 $ 19,060 $ 5,145
Financing Receivable, Allowance for Credit Losses      
Balance at beginning of the period 130,131 143,074 251,603
Transfer of balance to the RULC     (9,828)
Transfer of balance to OREO (1,221) (7,323) (28,126)
Loans charged off (26,515) (26,855) (26,481)
Recoveries 6,435 6,435 6,846
Balance at end of the period 138,378 130,131 143,074
Financing Receivable, Reserve For Unfunded Commitments      
Balance at beginning of the period 11,801 11,147 0
Transfer of balance from the allowance for loan losses     9,828
Balance at end of the period 14,145 11,801 11,147
Loans, net of unearned income:      
Balance at end of period 229,217 444,544  
Legacy Loans      
Financing Receivable, Allowance for Credit Losses      
Provision for Loan, Lease, and Other Losses 27,711 14,274 6,828
Financing Receivable, Allowance for Credit Losses      
Balance at beginning of the period 76,174 67,342 74,211
Transfer of balance to the RULC     (9,828)
Transfer of balance to OREO 0 0 0
Loans charged off (15,778) (11,312) (10,686)
Recoveries 5,701 5,870 6,817
Balance at end of the period 93,808 76,174 67,342
Financing Receivable, Reserve For Unfunded Commitments      
Balance at beginning of the period 11,801 11,147 0
Transfer of balance from the allowance for loan losses     9,828
Provision for (Reversal of) unfunded commitments 2,344 654 1,319
Balance at end of the period 14,145 11,801 11,147
Allowance on loans individually evaluated for impairment 3,993 430 1,029
Allowance on loans collectively evaluated for impairment 89,815 75,744 66,313
Loans, net of unearned income:      
Balance at end of period 11,190,520 9,668,714 8,288,321
Balance at end of period individually evaluated for impairment 66,641 11,700 26,182
Balance at end of period collectively evaluated for impairment 11,123,879 9,657,014 8,262,139
Legacy Loans | Commercial Loans | Real Estate      
Financing Receivable, Allowance for Credit Losses      
Provision for Loan, Lease, and Other Losses (1,466) 2,171 (5,919)
Financing Receivable, Allowance for Credit Losses      
Balance at beginning of the period 26,752 22,872 31,298
Transfer of balance to the RULC     (2,939)
Loans charged off (2,525) (1,164) (2,908)
Recoveries 1,897 2,873 3,340
Balance at end of the period 24,658 26,752 22,872
Financing Receivable, Reserve For Unfunded Commitments      
Balance at beginning of the period 3,370 3,071 0
Transfer of balance from the allowance for loan losses     2,939
Provision for (Reversal of) unfunded commitments 790 299 132
Balance at end of the period 4,160 3,370 3,071
Allowance on loans individually evaluated for impairment 1,246 20 8
Allowance on loans collectively evaluated for impairment 23,412 26,732 22,864
Loans, net of unearned income:      
Balance at end of period 4,504,062 3,676,811 3,054,100
Balance at end of period individually evaluated for impairment 28,857 7,013 8,705
Balance at end of period collectively evaluated for impairment 4,475,205 3,669,798 3,045,395
Legacy Loans | Commercial Loans | Commercial and Industrial      
Financing Receivable, Allowance for Credit Losses      
Provision for Loan, Lease, and Other Losses (103) 4,971 3,870
Financing Receivable, Allowance for Credit Losses      
Balance at beginning of the period 24,455 20,839 20,605
Transfer of balance to the RULC     (3,497)
Loans charged off (1,276) (1,400) (516)
Recoveries 207 45 377
Balance at end of the period 23,283 24,455 20,839
Financing Receivable, Reserve For Unfunded Commitments      
Balance at beginning of the period 3,733 1,814 0
Transfer of balance from the allowance for loan losses     3,497
Provision for (Reversal of) unfunded commitments (285) 1,919 (1,683)
Balance at end of the period 3,448 3,733 1,814
Allowance on loans individually evaluated for impairment 272 407 841
Allowance on loans collectively evaluated for impairment 23,011 24,048 19,998
Loans, net of unearned income:      
Balance at end of period 2,952,102 2,452,521 2,234,173
Balance at end of period individually evaluated for impairment 20,086 3,988 15,812
Balance at end of period collectively evaluated for impairment 2,932,016 2,448,533 2,218,361
Legacy Loans | Commercial Loans | Energy-Related      
Financing Receivable, Allowance for Credit Losses      
Provision for Loan, Lease, and Other Losses 17,917 (929) 66
Financing Receivable, Allowance for Credit Losses      
Balance at beginning of the period 5,949 6,878 6,812
Transfer of balance to the RULC     0
Loans charged off (3) 0 0
Recoveries 0 0 0
Balance at end of the period 23,863 5,949 6,878
Financing Receivable, Reserve For Unfunded Commitments      
Balance at beginning of the period 1,596 3,043 0
Transfer of balance from the allowance for loan losses     0
Provision for (Reversal of) unfunded commitments 1,069 (1,447) 3,043
Balance at end of the period 2,665 1,596 3,043
Allowance on loans individually evaluated for impairment 2,122 0 0
Allowance on loans collectively evaluated for impairment 21,741 5,949 6,878
Loans, net of unearned income:      
Balance at end of period 677,177 872,866 752,682
Balance at end of period individually evaluated for impairment 13,020 0 0
Balance at end of period collectively evaluated for impairment 664,157 872,866 752,682
Legacy Loans | Residential Mortgage      
Financing Receivable, Allowance for Credit Losses      
Provision for Loan, Lease, and Other Losses 1,493 566 758
Financing Receivable, Allowance for Credit Losses      
Balance at beginning of the period 2,678 2,546 1,583
Transfer of balance to the RULC     (40)
Loans charged off (291) (578) (519)
Recoveries 67 144 764
Balance at end of the period 3,947 2,678 2,546
Financing Receivable, Reserve For Unfunded Commitments      
Balance at beginning of the period 168 72 0
Transfer of balance from the allowance for loan losses     40
Provision for (Reversal of) unfunded commitments 662 96 32
Balance at end of the period 830 168 72
Allowance on loans individually evaluated for impairment 1 0 180
Allowance on loans collectively evaluated for impairment 3,946 2,678 2,366
Loans, net of unearned income:      
Balance at end of period 694,023 527,694 414,372
Balance at end of period individually evaluated for impairment 70 0 1,407
Balance at end of period collectively evaluated for impairment 693,953 527,694 412,965
Legacy Loans | Consumer and Other Loans      
Financing Receivable, Allowance for Credit Losses      
Provision for Loan, Lease, and Other Losses 9,870 7,495 8,053
Financing Receivable, Allowance for Credit Losses      
Balance at beginning of the period 16,340 14,207 13,913
Transfer of balance to the RULC     (3,352)
Loans charged off (11,683) (8,170) (6,743)
Recoveries 3,530 2,808 2,336
Balance at end of the period 18,057 16,340 14,207
Financing Receivable, Reserve For Unfunded Commitments      
Balance at beginning of the period 2,934 3,147 0
Transfer of balance from the allowance for loan losses     3,352
Provision for (Reversal of) unfunded commitments 108 (213) (205)
Balance at end of the period 3,042 2,934 3,147
Allowance on loans individually evaluated for impairment 352 3 0
Allowance on loans collectively evaluated for impairment 17,705 16,337 14,207
Loans, net of unearned income:      
Balance at end of period 2,363,156 2,138,822 1,832,994
Balance at end of period individually evaluated for impairment 4,608 699 258
Balance at end of period collectively evaluated for impairment 2,358,548 2,138,123 1,832,736
Acquired Loans      
Financing Receivable, Allowance for Credit Losses      
Balance at beginning of the period 53,957 75,732 177,392
Transfer of balance to the RULC     0
Provision for (Reversal of) loan losses 3,197 4,786 (1,683)
Increase (Decrease) in FDIC loss share receivable (1,360) (4,260) (56,085)
Transfer of balance to OREO (1,221) (7,323) (28,126)
Loans charged off (10,737) (15,543) (15,795)
Recoveries 734 565 29
Balance at end of the period 44,570 53,957 75,732
Financing Receivable, Reserve For Unfunded Commitments      
Balance at beginning of the period 0 0 0
Transfer of balance from the allowance for loan losses     0
Balance at end of the period 0 0 0
Allowance on loans individually evaluated for impairment 86 0 0
Allowance on loans collectively evaluated for impairment 44,484 53,957 75,732
Loans, net of unearned income:      
Balance at end of period 3,136,908 1,772,330 1,203,698
Balance at end of period individually evaluated for impairment 1,342 0 0
Balance at end of period collectively evaluated for impairment 2,410,856 905,179 750,909
Balance at end of period acquired with deteriorated credit quality 724,710 867,151 452,789
Acquired Loans | Commercial Loans | Real Estate      
Financing Receivable, Allowance for Credit Losses      
Balance at beginning of the period 29,949 42,026 107,269
Provision for (Reversal of) loan losses 2,182 665 (1,286)
Increase (Decrease) in FDIC loss share receivable 757 227 (28,238)
Transfer of balance to OREO 174 (1,897) (19,953)
Loans charged off (7,810) (11,201) (15,795)
Recoveries 727 129 29
Balance at end of the period 25,979 29,949 42,026
Financing Receivable, Reserve For Unfunded Commitments      
Allowance on loans individually evaluated for impairment 0 0 0
Allowance on loans collectively evaluated for impairment 25,979 29,949 42,026
Loans, net of unearned income:      
Balance at end of period 1,569,449 684,968 732,401
Balance at end of period individually evaluated for impairment 720 0 0
Balance at end of period collectively evaluated for impairment 1,149,315 169,338 393,487
Balance at end of period acquired with deteriorated credit quality 419,414 515,630 338,914
Acquired Loans | Commercial Loans | Commercial and Industrial      
Financing Receivable, Allowance for Credit Losses      
Balance at beginning of the period 3,265 6,641 13,246
Provision for (Reversal of) loan losses (122) 536 (1,146)
Increase (Decrease) in FDIC loss share receivable (49) 509 (5,032)
Transfer of balance to OREO (170) (2,030) (427)
Loans charged off (105) (2,451) 0
Recoveries 0 60 0
Balance at end of the period 2,819 3,265 6,641
Financing Receivable, Reserve For Unfunded Commitments      
Allowance on loans individually evaluated for impairment 41 0 0
Allowance on loans collectively evaluated for impairment 2,778 3,265 6,641
Loans, net of unearned income:      
Balance at end of period 492,476 119,174 90,062
Balance at end of period individually evaluated for impairment 164 0 0
Balance at end of period collectively evaluated for impairment 450,652 60,584 37,430
Balance at end of period acquired with deteriorated credit quality 41,660 58,590 52,632
Acquired Loans | Commercial Loans | Energy-Related      
Financing Receivable, Allowance for Credit Losses      
Balance at beginning of the period 51 0  
Provision for (Reversal of) loan losses 74 51  
Increase (Decrease) in FDIC loss share receivable 0 0  
Transfer of balance to OREO 0 0  
Loans charged off 0 0  
Recoveries 0 0  
Balance at end of the period 125 51 0
Financing Receivable, Reserve For Unfunded Commitments      
Allowance on loans individually evaluated for impairment 0 0  
Allowance on loans collectively evaluated for impairment 125 51  
Loans, net of unearned income:      
Balance at end of period 3,589 7,742  
Balance at end of period individually evaluated for impairment 0 0  
Balance at end of period collectively evaluated for impairment 3,589 7,742  
Balance at end of period acquired with deteriorated credit quality 0 0  
Acquired Loans | Residential Mortgage      
Financing Receivable, Allowance for Credit Losses      
Balance at beginning of the period 6,484 10,889 23,108
Provision for (Reversal of) loan losses 2,126 1,296 390
Increase (Decrease) in FDIC loss share receivable (235) (3,854) (4,896)
Transfer of balance to OREO (541) (1,719) (7,713)
Loans charged off 0 (232) 0
Recoveries 7 104 0
Balance at end of the period 7,841 6,484 10,889
Financing Receivable, Reserve For Unfunded Commitments      
Allowance on loans individually evaluated for impairment 0 0 0
Allowance on loans collectively evaluated for impairment 7,841 6,484 10,889
Loans, net of unearned income:      
Balance at end of period 501,296 552,603 172,160
Balance at end of period individually evaluated for impairment 0 0 0
Balance at end of period collectively evaluated for impairment 360,252 402,347 162,248
Balance at end of period acquired with deteriorated credit quality 141,044 150,256 9,912
Acquired Loans | Consumer and Other Loans      
Financing Receivable, Allowance for Credit Losses      
Balance at beginning of the period 14,208 16,176 33,769
Provision for (Reversal of) loan losses (1,063) 2,238 359
Increase (Decrease) in FDIC loss share receivable (1,833) (1,142) (17,919)
Transfer of balance to OREO (684) (1,677) (33)
Loans charged off (2,822) (1,659) 0
Recoveries 0 272 0
Balance at end of the period 7,806 14,208 16,176
Financing Receivable, Reserve For Unfunded Commitments      
Allowance on loans individually evaluated for impairment 45 0 0
Allowance on loans collectively evaluated for impairment 7,761 14,208 16,176
Loans, net of unearned income:      
Balance at end of period 570,098 407,843 209,075
Balance at end of period individually evaluated for impairment 458 0 0
Balance at end of period collectively evaluated for impairment 447,048 265,168 157,744
Balance at end of period acquired with deteriorated credit quality $ 122,592 $ 142,675 $ 51,331