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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
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Financing Receivable, Impaired      
Unpaid Principal Balance $ 219,771   $ 283,629
Recorded Investment 196,532   238,127
Related allowance (2,974)   (2,856)
Average Recorded Investment 189,754 $ 274,131  
Interest Income Recognized 1,695 1,523  
Commercial Loans      
Financing Receivable, Impaired      
Unpaid Principal Balance 178,886   237,922
Recorded Investment 157,214   194,201
Related allowance (19,698)   (17,352)
Average Recorded Investment 150,255 244,095  
Interest Income Recognized 1,280 1,198  
Residential Mortgage      
Financing Receivable, Impaired      
Unpaid Principal Balance 6,440   7,183
Recorded Investment 6,041   6,749
Related allowance (16,546)   (14,324)
Average Recorded Investment 6,064 5,070  
Interest Income Recognized 56 47  
Consumer and Other Loans      
Financing Receivable, Impaired      
Unpaid Principal Balance 34,445   38,524
Recorded Investment 33,277   37,177
Related allowance (178)   (172)
Average Recorded Investment 33,435 24,966  
Interest Income Recognized 359 278  
With No Related Allowance Recorded | Commercial Loans | Commercial real estate - Construction      
Financing Receivable, Impaired      
Unpaid Principal Balance 11,153   13,763
Recorded Investment 11,153   13,013
Average Recorded Investment 10,470 0  
Interest Income Recognized 144 0  
With No Related Allowance Recorded | Commercial Loans | Commercial real estate - owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 43,562   50,867
Recorded Investment 36,042   44,482
Average Recorded Investment 36,277 37,197  
Interest Income Recognized 334 339  
With No Related Allowance Recorded | Commercial Loans | Commercial real estate - non-owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 10,575   15,370
Recorded Investment 10,449   14,975
Average Recorded Investment 10,557 5,988  
Interest Income Recognized 98 17  
With No Related Allowance Recorded | Commercial Loans | Commercial and industrial      
Financing Receivable, Impaired      
Unpaid Principal Balance 45,720   103,013
Recorded Investment 36,829   70,254
Average Recorded Investment 27,832 90,664  
Interest Income Recognized 385 448  
With No Related Allowance Recorded | Commercial Loans | Residential mortgage      
Financing Receivable, Impaired      
Unpaid Principal Balance 1,083   2,004
Recorded Investment 1,083   2,001
Average Recorded Investment 1,090 735  
Interest Income Recognized 12 5  
With No Related Allowance Recorded | Consumer and Other Loans | Consumer - Home equity      
Financing Receivable, Impaired      
Unpaid Principal Balance 31   5,906
Recorded Investment 31   5,634
Average Recorded Investment 32 4,158  
Interest Income Recognized 0 40  
With No Related Allowance Recorded | Consumer and Other Loans | Consumer - Other      
Financing Receivable, Impaired      
Unpaid Principal Balance 0   75
Recorded Investment 0   75
With An Allowance Recorded | Commercial Loans | Commercial real estate - Construction      
Financing Receivable, Impaired      
Unpaid Principal Balance 236   238
Recorded Investment 154   156
Related allowance (18)   (19)
Average Recorded Investment 153 1,984  
Interest Income Recognized 1 1  
With An Allowance Recorded | Commercial Loans | Commercial real estate - owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 17,536   13,314
Recorded Investment 17,419   13,287
Related allowance (1,860)   (949)
Average Recorded Investment 17,608 20,980  
Interest Income Recognized 112 79  
With An Allowance Recorded | Commercial Loans | Commercial real estate - non-owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 3,399   6,051
Recorded Investment 3,272   5,872
Related allowance (628)   (620)
Average Recorded Investment 3,302 8,587  
Interest Income Recognized 10 94  
With An Allowance Recorded | Commercial Loans | Commercial and industrial      
Financing Receivable, Impaired      
Unpaid Principal Balance 46,705   35,306
Recorded Investment 41,896   32,162
Related allowance (14,040)   (12,736)
Average Recorded Investment 44,056 78,695  
Interest Income Recognized 196 220  
With An Allowance Recorded | Residential Mortgage | Residential mortgage      
Financing Receivable, Impaired      
Unpaid Principal Balance 5,357   5,179
Recorded Investment 4,958   4,748
Related allowance (178)   (172)
Average Recorded Investment 4,974 4,335  
Interest Income Recognized 44 42  
With An Allowance Recorded | Consumer and Other Loans | Consumer - Home equity      
Financing Receivable, Impaired      
Unpaid Principal Balance 28,917   27,189
Recorded Investment 28,187   26,575
Related allowance (2,435)   (2,358)
Average Recorded Investment 28,203 16,713  
Interest Income Recognized 292 179  
With An Allowance Recorded | Consumer and Other Loans | Consumer - Indirect Automobile      
Financing Receivable, Impaired      
Unpaid Principal Balance 1,004   1,034
Recorded Investment 656   679
Related allowance (75)   (79)
Average Recorded Investment 717 767  
Interest Income Recognized 5 7  
With An Allowance Recorded | Consumer and Other Loans | Consumer - Other      
Financing Receivable, Impaired      
Unpaid Principal Balance 4,493   4,320
Recorded Investment 4,403   4,214
Related allowance (464)   $ (419)
Average Recorded Investment 4,483 3,328  
Interest Income Recognized $ 62 $ 52