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Allowance for Credit Losses and Credit Quality - Schedule of Investment in Legacy Impaired Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired          
Unpaid Principal Balance $ 224,687   $ 224,687   $ 283,629
Recorded Investment 192,323   192,323   238,127
Related allowance (17,587)   (17,587)   (17,352)
Average Recorded Investment 198,792 $ 223,431 200,080 $ 226,529  
Interest Income Recognized 1,630 1,208 3,586 2,559  
Commercial Loans          
Financing Receivable, Impaired          
Unpaid Principal Balance 181,742   181,742   237,922
Recorded Investment 150,900   150,900   194,201
Related allowance (14,220)   (14,220)   (14,324)
Average Recorded Investment 157,138 189,643 158,760 193,734  
Interest Income Recognized 1,171 844 2,676 1,852  
Residential Mortgage          
Financing Receivable, Impaired          
Unpaid Principal Balance 6,310   6,310   7,183
Recorded Investment 5,873   5,873   6,749
Related allowance (168)   (168)   (172)
Average Recorded Investment 5,929 5,327 5,958 5,358  
Interest Income Recognized 60 48 119 97  
Consumer and Other Loans          
Financing Receivable, Impaired          
Unpaid Principal Balance 36,635   36,635   38,524
Recorded Investment 35,550   35,550   37,177
Related allowance (3,199)   (3,199)   (2,856)
Average Recorded Investment 35,725 28,461 35,362 27,437  
Interest Income Recognized 399 316 791 610  
With No Related Allowance Recorded | Commercial Loans | Commercial real estate - Construction          
Financing Receivable, Impaired          
Unpaid Principal Balance 13,970   13,970   13,763
Recorded Investment 13,034   13,034   13,013
Average Recorded Investment 12,952 3,953 12,597 3,953  
Interest Income Recognized 198 14 393 39  
With No Related Allowance Recorded | Commercial Loans | Commercial real estate - owner-occupied          
Financing Receivable, Impaired          
Unpaid Principal Balance 42,072   42,072   50,867
Recorded Investment 34,476   34,476   44,482
Average Recorded Investment 30,899 35,589 31,265 35,982  
Interest Income Recognized 209 180 609 453  
With No Related Allowance Recorded | Commercial Loans | Commercial real estate - non-owner-occupied          
Financing Receivable, Impaired          
Unpaid Principal Balance 16,333   16,333   15,370
Recorded Investment 15,357   15,357   14,975
Average Recorded Investment 15,929 4,476 16,558 4,501  
Interest Income Recognized 121 40 250 69  
With No Related Allowance Recorded | Commercial Loans | Commercial and industrial          
Financing Receivable, Impaired          
Unpaid Principal Balance 47,499   47,499   103,013
Recorded Investment 30,845   30,845   70,254
Average Recorded Investment 37,859 38,480 37,806 41,023  
Interest Income Recognized 389 175 836 374  
With No Related Allowance Recorded | Commercial Loans | Residential mortgage          
Financing Receivable, Impaired          
Unpaid Principal Balance 1,265   1,265   2,004
Recorded Investment 1,263   1,263   2,001
Average Recorded Investment 1,272 1,341 1,280 1,349  
Interest Income Recognized 13 13 27 27  
With No Related Allowance Recorded | Consumer and Other Loans | Consumer - Home equity          
Financing Receivable, Impaired          
Unpaid Principal Balance 1,904   1,904   5,906
Recorded Investment 1,879   1,879   5,634
Average Recorded Investment 1,910 4,875 1,922 4,885  
Interest Income Recognized 28 48 52 95  
With No Related Allowance Recorded | Consumer and Other Loans | Consumer - Other          
Financing Receivable, Impaired          
Unpaid Principal Balance 0   0   75
Recorded Investment 0   0   75
With An Allowance Recorded | Commercial Loans | Commercial real estate - Construction          
Financing Receivable, Impaired          
Unpaid Principal Balance 235   235   238
Recorded Investment 151   151   156
Related allowance (11)   (11)   (19)
Average Recorded Investment 152 214 152 232  
Interest Income Recognized 0 2 0 4  
With An Allowance Recorded | Commercial Loans | Commercial real estate - owner-occupied          
Financing Receivable, Impaired          
Unpaid Principal Balance 19,662   19,662   13,314
Recorded Investment 19,526   19,526   13,287
Related allowance (2,121)   (2,121)   (949)
Average Recorded Investment 19,582 17,973 19,696 18,067  
Interest Income Recognized 82 86 192 187  
With An Allowance Recorded | Commercial Loans | Commercial real estate - non-owner-occupied          
Financing Receivable, Impaired          
Unpaid Principal Balance 1,743   1,743   6,051
Recorded Investment 1,673   1,673   5,872
Related allowance (142)   (142)   (620)
Average Recorded Investment 1,631 7,935 1,705 7,965  
Interest Income Recognized 14 48 39 141  
With An Allowance Recorded | Commercial Loans | Commercial and industrial          
Financing Receivable, Impaired          
Unpaid Principal Balance 40,228   40,228   35,306
Recorded Investment 35,838   35,838   32,162
Related allowance (11,946)   (11,946)   (12,736)
Average Recorded Investment 38,134 81,023 38,981 82,011  
Interest Income Recognized 158 299 357 585  
With An Allowance Recorded | Residential Mortgage | Residential mortgage          
Financing Receivable, Impaired          
Unpaid Principal Balance 5,045   5,045   5,179
Recorded Investment 4,610   4,610   4,748
Related allowance (168)   (168)   (172)
Average Recorded Investment 4,657 3,986 4,678 4,009  
Interest Income Recognized 47 35 92 70  
With An Allowance Recorded | Consumer and Other Loans | Consumer - Home equity          
Financing Receivable, Impaired          
Unpaid Principal Balance 29,164   29,164   27,189
Recorded Investment 28,522   28,522   26,575
Related allowance (2,626)   (2,626)   (2,358)
Average Recorded Investment 28,595 19,482 28,173 18,583  
Interest Income Recognized 304 208 600 398  
With An Allowance Recorded | Consumer and Other Loans | Consumer - Other          
Financing Receivable, Impaired          
Unpaid Principal Balance 5,567   5,567   5,354
Recorded Investment 5,149   5,149   4,893
Related allowance (573)   (573)   $ (498)
Average Recorded Investment 5,220 4,104 5,267 3,969  
Interest Income Recognized $ 67 $ 60 $ 139 $ 117