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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired      
Unpaid Principal Balance $ 202,185 $ 209,746 $ 283,629
Recorded Investment 188,274 169,725 238,127
Related Allowance (20,897) (16,342) (17,352)
Average Recorded Investment 186,475 185,250 273,254
Interest Income Recognized 5,948 7,386 8,368
Commercial Loans      
Financing Receivable, Impaired      
Unpaid Principal Balance 130,206 164,209 237,922
Recorded Investment 118,653 125,706 194,201
Related Allowance (17,363) (13,282) (14,324)
Average Recorded Investment 119,342 142,895 232,590
Interest Income Recognized 3,711 5,601 6,595
Residential Mortgage      
Financing Receivable, Impaired      
Unpaid Principal Balance 30,671 7,114 7,183
Recorded Investment 29,402 6,579 6,749
Related Allowance (285) (145) (172)
Average Recorded Investment 26,730 6,755 6,905
Interest Income Recognized 579 271 265
Consumer and Other Loans      
Financing Receivable, Impaired      
Unpaid Principal Balance 41,308 38,423 38,524
Recorded Investment 40,219 37,440 37,177
Related Allowance (3,249) (2,915) (2,856)
Average Recorded Investment 40,403 35,600 33,759
Interest Income Recognized 1,658 1,514 1,508
With no related allowance recorded | Consumer - home equity      
Financing Receivable, Impaired      
Unpaid Principal Balance     5,906
Recorded Investment     5,634
Average Recorded Investment     5,747
Interest Income Recognized     231
With no related allowance recorded | Consumer - other      
Financing Receivable, Impaired      
Unpaid Principal Balance     75
Recorded Investment     75
Average Recorded Investment     11
Interest Income Recognized     1
With no related allowance recorded | Commercial Loans | Real estate - construction      
Financing Receivable, Impaired      
Unpaid Principal Balance 11,150 10,261 13,763
Recorded Investment 10,141 9,262 13,013
Average Recorded Investment 7,609 9,189 9,104
Interest Income Recognized 336 496 441
With no related allowance recorded | Commercial Loans | Real estate - owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 32,849 25,037 50,867
Recorded Investment 32,398 19,044 44,482
Average Recorded Investment 33,378 19,559 53,282
Interest Income Recognized 1,439 807 1,389
With no related allowance recorded | Commercial Loans | Real estate - non-owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 14,340 15,265 15,370
Recorded Investment 12,903 14,288 14,975
Average Recorded Investment 13,378 14,873 15,127
Interest Income Recognized 364 590 692
With no related allowance recorded | Commercial Loans | Commercial and industrial      
Financing Receivable, Impaired      
Unpaid Principal Balance 19,315 55,554 103,013
Recorded Investment 16,070 43,886 70,254
Average Recorded Investment 17,485 47,268 92,312
Interest Income Recognized 453 2,422 2,279
With no related allowance recorded | Residential Mortgage | Residential mortgage      
Financing Receivable, Impaired      
Unpaid Principal Balance 19,800 1,244 2,004
Recorded Investment 19,500 1,221 2,001
Average Recorded Investment 16,403 1,261 2,044
Interest Income Recognized 224 46 85
With no related allowance recorded | Consumer and Other Loans | Consumer - home equity      
Financing Receivable, Impaired      
Unpaid Principal Balance 4,465 4,183  
Recorded Investment 4,461 4,176  
Average Recorded Investment 4,390 2,867  
Interest Income Recognized 167 39  
With and allowance recorded | Commercial Loans | Real estate - construction      
Financing Receivable, Impaired      
Unpaid Principal Balance 141 228 238
Recorded Investment 126 140 156
Related Allowance (2) (11) (19)
Average Recorded Investment 138 148 197
Interest Income Recognized 3 1 6
With and allowance recorded | Commercial Loans | Real estate - owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 5,074 5,032 13,314
Recorded Investment 4,795 4,773 13,287
Related Allowance (2,591) (520) (949)
Average Recorded Investment 4,927 4,976 13,498
Interest Income Recognized 118 196 414
With and allowance recorded | Commercial Loans | Real estate - non-owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 9,828 6,445 6,051
Recorded Investment 9,456 6,398 5,872
Related Allowance (3,007) (105) (620)
Average Recorded Investment 9,620 6,229 6,196
Interest Income Recognized 208 294 154
With and allowance recorded | Commercial Loans | Commercial and industrial      
Financing Receivable, Impaired      
Unpaid Principal Balance 37,509 46,387 35,306
Recorded Investment 32,764 27,915 32,162
Related Allowance (11,763) (12,646) (12,736)
Average Recorded Investment 32,807 40,653 42,874
Interest Income Recognized 790 795 1,220
With and allowance recorded | Residential Mortgage | Residential mortgage      
Financing Receivable, Impaired      
Unpaid Principal Balance 10,871 5,870 5,179
Recorded Investment 9,902 5,358 4,748
Related Allowance (285) (145) (172)
Average Recorded Investment 10,327 5,494 4,861
Interest Income Recognized 355 225 180
With and allowance recorded | Consumer and Other Loans | Consumer - home equity      
Financing Receivable, Impaired      
Unpaid Principal Balance 31,581 29,284 27,189
Recorded Investment 30,798 28,818 26,575
Related Allowance (2,630) (2,427) (2,358)
Average Recorded Investment 30,762 27,911 23,546
Interest Income Recognized 1,228 1,202 1,007
With and allowance recorded | Consumer and Other Loans | Consumer - other      
Financing Receivable, Impaired      
Unpaid Principal Balance 5,262 4,956 5,354
Recorded Investment 4,960 4,446 4,893
Related Allowance (619) (488) (498)
Average Recorded Investment 5,251 4,822 4,455
Interest Income Recognized $ 263 $ 273 $ 269