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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired      
Unpaid Principal Balance $ 209,746 $ 283,629 $ 316,678
Recorded Investment 169,725 238,127 302,780
Related Allowance (16,342) (17,352) (24,293)
Average Recorded Investment 4,822 273,254 272,364
Interest Income Recognized 273 8,368 9,191
Commercial Loans      
Financing Receivable, Impaired      
Unpaid Principal Balance 164,209 237,922 294,649
Recorded Investment 125,706 194,201 282,001
Related Allowance (13,282) (14,324) (22,791)
Average Recorded Investment 142,895 232,590 255,325
Interest Income Recognized 5,601 6,595 8,444
Residential Mortgage      
Financing Receivable, Impaired      
Unpaid Principal Balance 7,114 7,183 4,628
Recorded Investment 6,579 6,749 4,312
Related Allowance (145) (172) (144)
Average Recorded Investment 6,755 6,905 4,377
Interest Income Recognized 271 265 161
Consumer and Other Loans      
Financing Receivable, Impaired      
Unpaid Principal Balance 38,423 38,524 17,401
Recorded Investment 37,440 37,177 16,467
Related Allowance (2,915) (2,856) (1,358)
Average Recorded Investment 35,600 33,759 12,662
Interest Income Recognized 1,514 1,508 586
With No Related Allowance Recorded | Commercial Loans | Commercial real estate - Construction      
Financing Receivable, Impaired      
Unpaid Principal Balance 10,261 13,763 38
Recorded Investment 9,262 13,013 38
Average Recorded Investment 9,189 9,104 28
Interest Income Recognized 496 441 0
With No Related Allowance Recorded | Commercial Loans | Commercial real estate - owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 25,037 50,867 25,180
Recorded Investment 19,044 44,482 25,074
Average Recorded Investment 19,559 53,282 25,890
Interest Income Recognized 807 1,389 647
With No Related Allowance Recorded | Commercial Loans | Commercial real estate - non-owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 15,265 15,370 15,654
Recorded Investment 14,288 14,975 14,794
Average Recorded Investment 14,873 15,127 19,587
Interest Income Recognized 590 692 879
With No Related Allowance Recorded | Commercial Loans | Commercial and industrial      
Financing Receivable, Impaired      
Unpaid Principal Balance 55,554 103,013 148,311
Recorded Investment 43,886 70,254 138,202
Average Recorded Investment 47,268 92,312 111,261
Interest Income Recognized 2,422 2,279 3,418
With No Related Allowance Recorded | Commercial Loans | Residential mortgage      
Financing Receivable, Impaired      
Unpaid Principal Balance 1,244 2,004  
Recorded Investment 1,221 2,001  
Average Recorded Investment 1,261 2,044  
Interest Income Recognized 46 85  
With No Related Allowance Recorded | Consumer and Other Loans | Consumer - Home equity      
Financing Receivable, Impaired      
Unpaid Principal Balance 4,183 5,906  
Recorded Investment 4,176 5,634  
Average Recorded Investment 2,867 5,747  
Interest Income Recognized 39 231  
With No Related Allowance Recorded | Consumer and Other Loans | Consumer - Other      
Financing Receivable, Impaired      
Unpaid Principal Balance   75  
Recorded Investment   75  
Average Recorded Investment   11  
Interest Income Recognized   1  
With An Allowance Recorded | Commercial Loans | Commercial real estate - Construction      
Financing Receivable, Impaired      
Unpaid Principal Balance 228 238 1,946
Recorded Investment 140 156 1,946
Related Allowance (11) (19) (649)
Average Recorded Investment 185,250 197 1,839
Interest Income Recognized 7,386 6 54
With An Allowance Recorded | Commercial Loans | Commercial real estate - owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 5,032 13,314 17,580
Recorded Investment 4,773 13,287 17,429
Related Allowance (520) (949) (640)
Average Recorded Investment 148 13,498 16,668
Interest Income Recognized 1 414 493
With An Allowance Recorded | Commercial Loans | Commercial real estate - non-owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 6,445 6,051 1,743
Recorded Investment 6,398 5,872 1,725
Related Allowance (105) (620) (89)
Average Recorded Investment 4,976 6,196 1,782
Interest Income Recognized 196 154 95
With An Allowance Recorded | Commercial Loans | Commercial and industrial      
Financing Receivable, Impaired      
Unpaid Principal Balance 46,387 35,306 84,197
Recorded Investment 27,915 32,162 82,793
Related Allowance (12,646) (12,736) (21,413)
Average Recorded Investment 6,229 42,874 78,270
Interest Income Recognized 294 1,220 2,858
With An Allowance Recorded | Residential Mortgage | Residential mortgage      
Financing Receivable, Impaired      
Unpaid Principal Balance 5,870 5,179 4,628
Recorded Investment 5,358 4,748 4,312
Related Allowance (145) (172) (144)
Average Recorded Investment 40,653 4,861 4,377
Interest Income Recognized 795 180 161
With An Allowance Recorded | Consumer and Other Loans | Consumer - Home equity      
Financing Receivable, Impaired      
Unpaid Principal Balance 29,284 27,189 13,916
Recorded Investment 28,818 26,575 13,267
Related Allowance (2,427) (2,358) (993)
Average Recorded Investment 5,494 23,546 10,237
Interest Income Recognized 225 1,007 435
With An Allowance Recorded | Consumer and Other Loans | Consumer - Other      
Financing Receivable, Impaired      
Unpaid Principal Balance 4,956 5,354 3,485
Recorded Investment 4,446 4,893 3,200
Related Allowance (488) (498) (365)
Average Recorded Investment 27,911 4,455 2,425
Interest Income Recognized $ 1,202 $ 269 $ 151