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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 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Financing Receivable, Impaired      
Unpaid Principal Balance $ 210,519   $ 209,746
Recorded Investment 175,312   169,725
Related allowance (16,948)   (16,342)
Average Recorded Investment 177,593 $ 189,754  
Interest Income Recognized 1,725 1,695  
Commercial Loans      
Financing Receivable, Impaired      
Unpaid Principal Balance 165,114   164,209
Recorded Investment 131,798   125,706
Related allowance (14,066)   (13,282)
Average Recorded Investment 133,993 150,255  
Interest Income Recognized 1,289 1,280  
Residential Mortgage      
Financing Receivable, Impaired      
Unpaid Principal Balance 8,201   7,114
Recorded Investment 7,679   6,579
Related allowance (258)   (145)
Average Recorded Investment 7,737 6,064  
Interest Income Recognized 76 56  
Consumer and Other Loans      
Financing Receivable, Impaired      
Unpaid Principal Balance 37,204   38,423
Recorded Investment 35,835   37,440
Related allowance (2,624)   (2,915)
Average Recorded Investment 35,863 33,435  
Interest Income Recognized 360 359  
With No Related Allowance Recorded [Member] | Commercial Loans | Commercial real estate - Construction      
Financing Receivable, Impaired      
Unpaid Principal Balance 12,138   10,261
Recorded Investment 11,139   9,262
Average Recorded Investment   10,470 11,142
Interest Income Recognized 169 144  
With No Related Allowance Recorded [Member] | Commercial Loans | Commercial real estate - owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 33,670   25,037
Recorded Investment 27,732   19,044
Average Recorded Investment 27,865 36,277  
Interest Income Recognized 301 334  
With No Related Allowance Recorded [Member] | Commercial Loans | Commercial real estate - non-owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 12,352   15,265
Recorded Investment 11,515   14,288
Average Recorded Investment 11,566 10,557  
Interest Income Recognized 69 98  
With No Related Allowance Recorded [Member] | Commercial Loans | Commercial and industrial      
Financing Receivable, Impaired      
Unpaid Principal Balance 52,821   55,554
Recorded Investment 32,380   43,886
Average Recorded Investment 37,185 27,832  
Interest Income Recognized 461 385  
With No Related Allowance Recorded [Member] | Commercial Loans | Residential mortgage      
Financing Receivable, Impaired      
Unpaid Principal Balance 1,456   1,244
Recorded Investment 1,456   1,221
Average Recorded Investment 1,463 1,090  
Interest Income Recognized 17 12  
With No Related Allowance Recorded [Member] | Consumer and Other Loans | Consumer - Home equity      
Financing Receivable, Impaired      
Unpaid Principal Balance 1,783   4,183
Recorded Investment 1,783   4,176
Average Recorded Investment 1,204 32  
Interest Income Recognized 10 0  
With No Related Allowance Recorded [Member] | Consumer and Other Loans | Consumer - Other      
Financing Receivable, Impaired      
Unpaid Principal Balance 0   0
Recorded Investment 0   0
With An Allowance Recorded | Commercial Loans | Commercial real estate - Construction      
Financing Receivable, Impaired      
Unpaid Principal Balance 224   228
Recorded Investment 134   140
Related allowance (11)   (11)
Average Recorded Investment 136 153  
Interest Income Recognized 0 1  
With An Allowance Recorded | Commercial Loans | Commercial real estate - owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 5,553   5,032
Recorded Investment 5,393   4,773
Related allowance (613)   (520)
Average Recorded Investment 5,433 17,608  
Interest Income Recognized 8 112  
With An Allowance Recorded | Commercial Loans | Commercial real estate - non-owner-occupied      
Financing Receivable, Impaired      
Unpaid Principal Balance 12,113   6,445
Recorded Investment 11,996   6,398
Related allowance (2,454)   (105)
Average Recorded Investment 12,042 3,302  
Interest Income Recognized 79 10  
With An Allowance Recorded | Commercial Loans | Commercial and industrial      
Financing Receivable, Impaired      
Unpaid Principal Balance 36,243   46,387
Recorded Investment 31,509   27,915
Related allowance (10,988)   (12,646)
Average Recorded Investment 28,624 44,056  
Interest Income Recognized 202 196  
With An Allowance Recorded | Residential Mortgage | Residential mortgage      
Financing Receivable, Impaired      
Unpaid Principal Balance 6,745   5,870
Recorded Investment 6,223   5,358
Related allowance (258)   (145)
Average Recorded Investment 6,274 4,974  
Interest Income Recognized 59 44  
With An Allowance Recorded | Consumer and Other Loans | Consumer - Home equity      
Financing Receivable, Impaired      
Unpaid Principal Balance 30,847   29,284
Recorded Investment 29,861   28,818
Related allowance (2,132)   (2,427)
Average Recorded Investment 30,345 28,203  
Interest Income Recognized 292 292  
With An Allowance Recorded | Consumer and Other Loans | Consumer - Other      
Financing Receivable, Impaired      
Unpaid Principal Balance 4,574   4,956
Recorded Investment 4,191   4,446
Related allowance (492)   $ (488)
Average Recorded Investment 4,314 5,200  
Interest Income Recognized $ 58 $ 67