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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Financing Receivable, Impaired          
Unpaid Principal Balance $ 231,852   $ 231,852   $ 209,746
Recorded Investment 209,681   209,681   169,725
Related allowance (15,854)   (15,854)   (16,342)
Average Recorded Investment 211,628 $ 198,792 204,202 $ 200,080  
Interest Income Recognized 1,920 1,630 3,767 3,586  
Commercial Loans          
Financing Receivable, Impaired          
Unpaid Principal Balance 149,106   149,106   164,209
Recorded Investment 129,191   129,191   125,706
Related allowance (12,329)   (12,329)   (13,282)
Average Recorded Investment 135,250 157,138 136,636 158,760  
Interest Income Recognized 1,195 1,171 2,396 2,676  
Residential mortgage loans          
Financing Receivable, Impaired          
Unpaid Principal Balance 42,814   42,814   7,114
Recorded Investment 41,363   41,363   6,579
Related allowance (349)   (349)   (145)
Average Recorded Investment 36,962 5,929 28,685 5,958  
Interest Income Recognized 308 60 543 119  
Consumer and Other Loans          
Financing Receivable, Impaired          
Unpaid Principal Balance 39,932   39,932   38,423
Recorded Investment 39,127   39,127   37,440
Related allowance (3,176)   (3,176)   (2,915)
Average Recorded Investment 39,416 35,725 38,881 35,362  
Interest Income Recognized 417 399 828 791  
With No Related Allowance Recorded | Commercial Loans | Real estate - construction          
Financing Receivable, Impaired          
Unpaid Principal Balance 12,138   12,138   10,261
Recorded Investment 11,139   11,139   9,262
Average Recorded Investment 21,339 12,952 21,340 12,597  
Interest Income Recognized 341 198 678 393  
With No Related Allowance Recorded | Commercial Loans | Real estate - owner-occupied          
Financing Receivable, Impaired          
Unpaid Principal Balance 27,142   27,142   25,037
Recorded Investment 27,064   27,064   19,044
Average Recorded Investment 24,134 30,899 27,314 31,265  
Interest Income Recognized 326 209 569 609  
With No Related Allowance Recorded | Commercial Loans | Real estate - non-owner-occupied          
Financing Receivable, Impaired          
Unpaid Principal Balance 21,234   21,234   15,265
Recorded Investment 20,271   20,271   14,288
Average Recorded Investment 20,305 15,929 20,360 16,558  
Interest Income Recognized 100 121 207 250  
With No Related Allowance Recorded | Commercial Loans | Commercial and industrial          
Financing Receivable, Impaired          
Unpaid Principal Balance 33,989   33,989   55,554
Recorded Investment 30,157   30,157   43,886
Average Recorded Investment 29,315 37,859 29,816 37,806  
Interest Income Recognized 151 389 331 836  
With No Related Allowance Recorded | Commercial Loans | Residential mortgage          
Financing Receivable, Impaired          
Unpaid Principal Balance 32,448   32,448   1,244
Recorded Investment 31,645   31,645   1,221
Average Recorded Investment 27,129 1,272 18,804 1,280  
Interest Income Recognized 235 13 374 27  
With No Related Allowance Recorded | Consumer and Other Loans | Consumer - Home equity          
Financing Receivable, Impaired          
Unpaid Principal Balance 1,995   1,995   4,183
Recorded Investment 1,998   1,998   4,176
Average Recorded Investment 1,998 1,910 1,943 1,922  
Interest Income Recognized 22 28 44 52  
With No Related Allowance Recorded | Consumer and Other Loans | Consumer - Other          
Financing Receivable, Impaired          
Unpaid Principal Balance 0   0   0
Recorded Investment 0   0   0
With An Allowance Recorded | Commercial Loans | Real estate - construction          
Financing Receivable, Impaired          
Unpaid Principal Balance 140   140   228
Recorded Investment 127   127   140
Related allowance (2)   (2)   (11)
Average Recorded Investment 131 152 135 152  
Interest Income Recognized 1 0 2 0  
With An Allowance Recorded | Commercial Loans | Real estate - owner-occupied          
Financing Receivable, Impaired          
Unpaid Principal Balance 8,811   8,811   5,032
Recorded Investment 8,248   8,248   4,773
Related allowance (4,061)   (4,061)   (520)
Average Recorded Investment 8,578 19,582 8,628 19,696  
Interest Income Recognized 57 82 116 192  
With An Allowance Recorded | Commercial Loans | Real estate - non-owner-occupied          
Financing Receivable, Impaired          
Unpaid Principal Balance 7,683   7,683   6,445
Recorded Investment 7,482   7,482   6,398
Related allowance (610)   (610)   (105)
Average Recorded Investment 7,557 1,631 7,643 1,705  
Interest Income Recognized 42 14 122 39  
With An Allowance Recorded | Commercial Loans | Commercial and industrial          
Financing Receivable, Impaired          
Unpaid Principal Balance 37,969   37,969   46,387
Recorded Investment 24,703   24,703   27,915
Related allowance (7,656)   (7,656)   (12,646)
Average Recorded Investment 23,891 38,134 21,400 38,981  
Interest Income Recognized 177 158 371 357  
With An Allowance Recorded | Residential mortgage loans | Residential mortgage          
Financing Receivable, Impaired          
Unpaid Principal Balance 10,366   10,366   5,870
Recorded Investment 9,718   9,718   5,358
Related allowance (349)   (349)   (145)
Average Recorded Investment 9,833 4,657 9,881 4,678  
Interest Income Recognized 73 47 169 92  
With An Allowance Recorded | Consumer and Other Loans | Consumer - Home equity          
Financing Receivable, Impaired          
Unpaid Principal Balance 33,194   33,194   29,284
Recorded Investment 32,702   32,702   28,818
Related allowance (2,662)   (2,662)   (2,427)
Average Recorded Investment 32,885 28,595 32,341 28,173  
Interest Income Recognized 332 304 656 600  
With An Allowance Recorded | Consumer and Other Loans | Consumer - Other          
Financing Receivable, Impaired          
Unpaid Principal Balance 4,743   4,743   4,956
Recorded Investment 4,427   4,427   4,446
Related allowance (514)   (514)   $ (488)
Average Recorded Investment 4,533 5,220 4,597 5,267  
Interest Income Recognized $ 63 $ 67 $ 128 $ 139