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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financing Receivable, Impaired          
Unpaid Principal Balance $ 227,102   $ 227,102   $ 209,746
Recorded Investment 205,395   205,395   169,725
Related allowance (14,015)   (14,015)   (16,342)
Average Recorded Investment 212,055 $ 197,593 207,955 $ 201,997  
Interest Income Recognized 1,460 1,829 4,845 5,852  
Commercial Loans          
Financing Receivable, Impaired          
Unpaid Principal Balance 144,093   144,093   164,209
Recorded Investment 125,065   125,065   125,706
Related allowance (10,695)   (10,695)   (13,282)
Average Recorded Investment 130,634 157,333 131,217 162,163  
Interest Income Recognized 846 1,398 3,011 4,551  
Residential mortgage loans          
Financing Receivable, Impaired          
Unpaid Principal Balance 44,192   44,192   7,114
Recorded Investment 42,423   42,423   6,579
Related allowance (281)   (281)   (145)
Average Recorded Investment 43,310 6,268 38,817 6,337  
Interest Income Recognized 210 59 623 185  
Consumer and Other Loans          
Financing Receivable, Impaired          
Unpaid Principal Balance 38,817   38,817   38,423
Recorded Investment 37,907   37,907   37,440
Related allowance (3,039)   (3,039)   (2,915)
Average Recorded Investment 38,111 33,992 37,921 33,497  
Interest Income Recognized 404 372 1,211 1,116  
With No Related Allowance Recorded | Commercial Loans | Real estate - construction          
Financing Receivable, Impaired          
Unpaid Principal Balance 9,540   9,540   10,261
Recorded Investment 8,531   8,531   9,262
Average Recorded Investment 7,333 10,806 7,145 10,371  
Interest Income Recognized 82 164 242 460  
With No Related Allowance Recorded | Commercial Loans | Real estate - owner-occupied          
Financing Receivable, Impaired          
Unpaid Principal Balance 33,985   33,985   25,037
Recorded Investment 33,590   33,590   19,044
Average Recorded Investment 33,895 34,118 34,437 34,505  
Interest Income Recognized 355 209 1,235 903  
With No Related Allowance Recorded | Commercial Loans | Real estate - non-owner-occupied          
Financing Receivable, Impaired          
Unpaid Principal Balance 23,964   23,964   15,265
Recorded Investment 22,652   22,652   14,288
Average Recorded Investment 22,794 22,091 22,910 22,988  
Interest Income Recognized 72 249 301 746  
With No Related Allowance Recorded | Commercial Loans | Commercial and industrial          
Financing Receivable, Impaired          
Unpaid Principal Balance 21,813   21,813   55,554
Recorded Investment 17,771   17,771   43,886
Average Recorded Investment 20,594 43,409 20,727 40,564  
Interest Income Recognized 108 523 401 1,543  
With No Related Allowance Recorded | Commercial Loans | Residential mortgage          
Financing Receivable, Impaired          
Unpaid Principal Balance 36,182   36,182   1,244
Recorded Investment 35,089   35,089   1,221
Average Recorded Investment 35,896 1,254 31,315 1,271  
Interest Income Recognized 136 9 391 36  
With No Related Allowance Recorded | Consumer and Other Loans | Consumer - Home equity          
Financing Receivable, Impaired          
Unpaid Principal Balance 4,736   4,736   4,183
Recorded Investment 4,734   4,734   4,176
Average Recorded Investment 4,736 705 4,613 708  
Interest Income Recognized 47 2 137 16  
With An Allowance Recorded | Commercial Loans | Real estate - construction          
Financing Receivable, Impaired          
Unpaid Principal Balance 98   98   228
Recorded Investment 85   85   140
Related allowance (1)   (1)   (11)
Average Recorded Investment 87 148 93 151  
Interest Income Recognized 0 0 0 1  
With An Allowance Recorded | Commercial Loans | Real estate - owner-occupied          
Financing Receivable, Impaired          
Unpaid Principal Balance 5,135   5,135   5,032
Recorded Investment 4,921   4,921   4,773
Related allowance (2,529)   (2,529)   (520)
Average Recorded Investment 4,952 4,006 5,050 4,044  
Interest Income Recognized 10 83 113 102  
With An Allowance Recorded | Commercial Loans | Real estate - non-owner-occupied          
Financing Receivable, Impaired          
Unpaid Principal Balance 4,149   4,149   6,445
Recorded Investment 3,936   3,936   6,398
Related allowance (191)   (191)   (105)
Average Recorded Investment 4,155 2,398 4,090 2,442  
Interest Income Recognized 46 20 137 76  
With An Allowance Recorded | Commercial Loans | Commercial and industrial          
Financing Receivable, Impaired          
Unpaid Principal Balance 45,409   45,409   46,387
Recorded Investment 33,579   33,579   27,915
Related allowance (7,974)   (7,974)   (12,646)
Average Recorded Investment 36,824 40,357 36,765 47,098  
Interest Income Recognized 173 150 582 720  
With An Allowance Recorded | Residential mortgage loans | Residential mortgage          
Financing Receivable, Impaired          
Unpaid Principal Balance 8,010   8,010   5,870
Recorded Investment 7,334   7,334   5,358
Related allowance (281)   (281)   (145)
Average Recorded Investment 7,414 5,014 7,502 5,066  
Interest Income Recognized 74 50 232 149  
With An Allowance Recorded | Consumer and Other Loans | Consumer - Home equity          
Financing Receivable, Impaired          
Unpaid Principal Balance 29,773   29,773   29,284
Recorded Investment 29,124   29,124   28,818
Related allowance (2,577)   (2,577)   (2,427)
Average Recorded Investment 29,200 28,577 28,982 27,905  
Interest Income Recognized 298 305 890 892  
With An Allowance Recorded | Consumer and Other Loans | Consumer - Other          
Financing Receivable, Impaired          
Unpaid Principal Balance 4,308   4,308   4,956
Recorded Investment 4,049   4,049   4,446
Related allowance (462)   (462)   $ (488)
Average Recorded Investment 4,175 4,710 4,326 4,884  
Interest Income Recognized $ 59 $ 65 $ 184 $ 208