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Allowance for Credit Losses and Credit Quality - Schedule of Investment in Impaired Loan (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Financing Receivable, Impaired          
Recorded investment $ 265,616   $ 265,616   $ 102,733
Unpaid principal balance 242,989   242,989   89,516
Related allowance (14,609)   (14,609)   (4,123)
Average recorded investment 225,838 $ 82,835 227,451 $ 83,669  
Interest income recognized 1,831 222 3,847 593  
Commercial Loans          
Financing Receivable, Impaired          
Recorded investment 229,519   229,519   73,846
Unpaid principal balance 210,740   210,740   63,944
Related allowance (13,603)   (13,603)   (3,655)
Average recorded investment 193,806 53,203 195,320 53,507  
Interest income recognized 1,652 222 3,468 546  
Residential Mortgage          
Financing Receivable, Impaired          
Recorded investment 17,243   17,243   14,806
Unpaid principal balance 15,994   15,994   13,743
Related allowance (151)   (151)   (64)
Average recorded investment 16,213 15,721 16,354 15,927  
Interest income recognized 50 0 111 16  
Consumer - Other          
Financing Receivable, Impaired          
Recorded investment 18,854   18,854   14,081
Unpaid principal balance 16,255   16,255   11,829
Related allowance (855)   (855)   (404)
Average recorded investment 15,819 13,911 15,777 14,235  
Interest income recognized 129 0 268 31  
With No Related Allowance Recorded | Commercial Loans | Commercial real estate          
Financing Receivable, Impaired          
Recorded investment 16,362   16,362   17,002
Unpaid principal balance 15,492   15,492   16,145
Average recorded investment 15,494 16,361 15,569 16,417  
Interest income recognized 143 5 278 15  
With No Related Allowance Recorded | Commercial Loans | Commercial and Industrial          
Financing Receivable, Impaired          
Recorded investment 32,292   32,292   14,571
Unpaid principal balance 32,177   32,177   14,340
Average recorded investment 36,212 13,715 41,074 13,924  
Interest income recognized 467 14 947 44  
With No Related Allowance Recorded | Commercial Loans | Energy-Related          
Financing Receivable, Impaired          
Recorded investment 116,226   116,226   0
Unpaid principal balance 116,160   116,160   0
Average recorded investment 106,692 0 102,364 0  
Interest income recognized 912 0 1,857 0  
With No Related Allowance Recorded | Residential Mortgage | Residential Mortgage          
Financing Receivable, Impaired          
Recorded investment 825   825   0
Unpaid principal balance 825   825   0
Average recorded investment 825 0 825 0  
Interest income recognized 10 0 19 0  
With No Related Allowance Recorded | Consumer - Other | Consumer - Home Equity          
Financing Receivable, Impaired          
Recorded investment 0   0   730
Unpaid principal balance 0   0   730
Average recorded investment 0 230 0 233  
Interest income recognized 0 0 0 0  
With No Related Allowance Recorded | Consumer - Other | Consumer - Other          
Financing Receivable, Impaired          
Recorded investment 0   0   66
Unpaid principal balance 0   0   66
With An Allowance Recorded | Commercial Loans | Commercial real estate          
Financing Receivable, Impaired          
Recorded investment 20,075   20,075   21,377
Unpaid principal balance 11,580   11,580   13,753
Related allowance (696)   (696)   (1,253)
Average recorded investment 16,492 5,316 19,749 5,034  
Interest income recognized 85 16 173 37  
With An Allowance Recorded | Commercial Loans | Commercial and Industrial          
Financing Receivable, Impaired          
Recorded investment 4,331   4,331   7,422
Unpaid principal balance 3,017   3,017   6,262
Related allowance (981)   (981)   (277)
Average recorded investment 3,112 14,354 3,945 14,675  
Interest income recognized 33 133 162 362  
With An Allowance Recorded | Commercial Loans | Energy-Related          
Financing Receivable, Impaired          
Recorded investment 40,233   40,233   13,474
Unpaid principal balance 32,314   32,314   13,444
Related allowance (11,926)   (11,926)   (2,125)
Average recorded investment 15,804 3,457 12,619 3,457  
Interest income recognized 12 54 51 88  
With An Allowance Recorded | Residential Mortgage | Residential Mortgage          
Financing Receivable, Impaired          
Recorded investment 16,418   16,418   14,806
Unpaid principal balance 15,169   15,169   13,743
Related allowance (151)   (151)   (64)
Average recorded investment 15,388 15,721 15,529 15,927  
Interest income recognized 40 0 92 16  
With An Allowance Recorded | Consumer - Other | Consumer - Home Equity          
Financing Receivable, Impaired          
Recorded investment 13,739   13,739   9,486
Unpaid principal balance 12,446   12,446   8,559
Related allowance (697)   (697)   (363)
Average recorded investment 11,831 9,497 11,719 9,680  
Interest income recognized 84 0 169 8  
With An Allowance Recorded | Consumer - Other | Consumer - Indirect Automobile          
Financing Receivable, Impaired          
Recorded investment 2,551   2,551   1,955
Unpaid principal balance 1,556   1,556   1,181
Related allowance (109)   (109)   (10)
Average recorded investment 1,831 1,691 2,001 1,792  
Interest income recognized 17 0 45 13  
With An Allowance Recorded | Consumer - Other | Consumer - Credit Card          
Financing Receivable, Impaired          
Recorded investment 533   533   394
Unpaid principal balance 533   533   394
Related allowance (11)   (11)   (8)
Average recorded investment 461 1,199 457 1,196  
Interest income recognized 0 0 0 0  
With An Allowance Recorded | Consumer - Other | Consumer - Other          
Financing Receivable, Impaired          
Recorded investment 2,031   2,031   1,450
Unpaid principal balance 1,720   1,720   899
Related allowance (38)   (38)   $ (23)
Average recorded investment 1,696 1,294 1,600 1,334  
Interest income recognized $ 28 $ 0 $ 54 $ 10