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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired      
Unpaid Principal Balance $ 283,629 $ 316,678 $ 64,016
Recorded Investment 238,127 302,780 62,848
Related Allowance (2,856) (24,293)  
Average Recorded Investment 273,254 272,364 68,750
Interest Income Recognized 8,368 9,191 2,830
Commercial Loans      
Financing Receivable, Impaired      
Unpaid Principal Balance 237,922 294,649 70
Recorded Investment 194,201 282,001 70
Related Allowance (17,352) (22,791) (3,681)
Average Recorded Investment 232,590 255,325 70
Interest Income Recognized 6,595 8,444 5
Residential Mortgage      
Financing Receivable, Impaired      
Unpaid Principal Balance 7,183 4,628 5,243
Recorded Investment 6,749 4,312 5,066
Related Allowance (14,324) (144) (1)
Average Recorded Investment 6,905 4,377 3,541
Interest Income Recognized 265 161 103
Consumer and Other Loans      
Financing Receivable, Impaired      
Unpaid Principal Balance 38,524 17,401  
Recorded Investment 37,177 16,467  
Related Allowance (172) (1,358) (397)
Average Recorded Investment 33,759 12,662  
Interest Income Recognized 1,508 586  
With No Related Allowance Recorded | Commercial Loans | Commercial real estate - Construction      
Financing Receivable, Impaired      
Unpaid Principal Balance 13,763 38 54
Recorded Investment 13,013 38 51
Average Recorded Investment 9,104 28 55
Interest Income Recognized 441 0 1
With No Related Allowance Recorded | Commercial Loans | Commercial real estate - owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 50,867 25,180 3,630
Recorded Investment 44,482 25,074 3,495
Average Recorded Investment 53,282 25,890 2,928
Interest Income Recognized 1,389 647 106
With No Related Allowance Recorded | Commercial Loans | Commercial real estate - non-owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 15,370 15,654 13,318
Recorded Investment 14,975 14,794 12,600
Average Recorded Investment 15,127 19,587 12,881
Interest Income Recognized 692 879 209
With No Related Allowance Recorded | Commercial Loans | Commercial and industrial      
Financing Receivable, Impaired      
Unpaid Principal Balance 103,013 148,311 14,571
Recorded Investment 70,254 138,202 14,340
Average Recorded Investment 92,312 111,261 18,839
Interest Income Recognized 2,279 3,418 1,148
With No Related Allowance Recorded | Commercial Loans | Residential mortgage      
Financing Receivable, Impaired      
Unpaid Principal Balance 2,004    
Recorded Investment 2,001    
Average Recorded Investment 2,044    
Interest Income Recognized 85    
With No Related Allowance Recorded | Consumer and Other Loans | Consumer - Home equity      
Financing Receivable, Impaired      
Unpaid Principal Balance 5,906 0 730
Recorded Investment 5,634 0 730
Average Recorded Investment 5,747 0 533
Interest Income Recognized 231 0 22
With No Related Allowance Recorded | Consumer and Other Loans | Consumer - Other      
Financing Receivable, Impaired      
Unpaid Principal Balance 75 0 66
Recorded Investment 75 0 66
Average Recorded Investment 11 0 66
Interest Income Recognized 1 0 5
With An Allowance Recorded | Commercial Loans | Commercial real estate - Construction      
Financing Receivable, Impaired      
Unpaid Principal Balance 238 1,946 3
Recorded Investment 156 1,946 3
Related Allowance (19) (649) (2)
Average Recorded Investment 197 1,839 57
Interest Income Recognized 6 54 1
With An Allowance Recorded | Commercial Loans | Commercial real estate - owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 13,314 17,580 12,744
Recorded Investment 13,287 17,429 12,691
Related Allowance (949) (640) (1,244)
Average Recorded Investment 13,498 16,668 12,908
Interest Income Recognized 414 493 527
With An Allowance Recorded | Commercial Loans | Commercial real estate - non-owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 6,051 1,743 738
Recorded Investment 5,872 1,725 738
Related Allowance (620) (89) (41)
Average Recorded Investment 6,196 1,782 1,027
Interest Income Recognized 154 95 62
With An Allowance Recorded | Commercial Loans | Commercial and industrial      
Financing Receivable, Impaired      
Unpaid Principal Balance 35,306 84,197 18,958
Recorded Investment 32,162 82,793 18,930
Related Allowance (12,736) (21,413) (2,394)
Average Recorded Investment 42,874 78,270 20,055
Interest Income Recognized 1,220 2,858 776
With An Allowance Recorded | Residential Mortgage | Residential mortgage      
Financing Receivable, Impaired      
Unpaid Principal Balance 5,179 4,628 70
Recorded Investment 4,748 4,312 70
Related Allowance (172) (144) (1)
Average Recorded Investment 4,861 4,377 70
Interest Income Recognized 180 161 5
With An Allowance Recorded | Consumer and Other Loans | Consumer - Home equity      
Financing Receivable, Impaired      
Unpaid Principal Balance 27,189 13,916 3,859
Recorded Investment 26,575 13,267 3,683
Related Allowance (2,358) (993) (338)
Average Recorded Investment 23,546 10,237 2,454
Interest Income Recognized 1,007 435 73
With An Allowance Recorded | Consumer and Other Loans | Consumer - Indirect Automobile      
Financing Receivable, Impaired      
Unpaid Principal Balance 1,034 1,037 588
Recorded Investment 679 758 587
Related Allowance (79) (114) (59)
Average Recorded Investment 873 956 488
Interest Income Recognized 38 49 3
With An Allowance Recorded | Consumer and Other Loans | Consumer - Other      
Financing Receivable, Impaired      
Unpaid Principal Balance 4,320 2,448 69,329
Recorded Investment 4,214 2,442 67,984
Related Allowance (419) (251) (4,079)
Average Recorded Investment 3,582 1,469 72,361
Interest Income Recognized $ 231 $ 102 $ 2,938