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Loans and Allowance for Loan Losses - Summary of Company's Impaired Loans by Loan Portfolio (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Recorded Investment $ 35,904 $ 35,717
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 41,795 42,455
Impaired financing receivable, with no related allowance, Recorded Investment 38,486 39,892
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 43,703 44,675
Impaired financing receivable, Related Allowance 8,137 8,054
Impaired financing receivable, Recorded Investment 74,390 75,609
Impaired financing receivable, Unpaid Principal Balance 85,498 87,130
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Recorded Investment 10,071 9,182
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 11,312 11,212
Impaired financing receivable, with no related allowance, Recorded Investment 7,836 8,161
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 8,147 8,432
Impaired financing receivable, Related Allowance 4,761 4,555
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Recorded Investment 4,068 3,955
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 4,113 3,974
Impaired financing receivable, with no related allowance, Recorded Investment 468 480
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 489 497
Impaired financing receivable, Related Allowance 210 210
Business banking    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Recorded Investment 4,961 5,250
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 7,260 7,659
Impaired financing receivable, with no related allowance, Recorded Investment 16,040 16,651
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 20,925 21,146
Impaired financing receivable, Related Allowance 1,387 1,435
Residential real estate    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Recorded Investment 14,408 14,730
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 16,714 17,010
Impaired financing receivable, with no related allowance, Recorded Investment 12,051 12,326
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 12,051 12,326
Impaired financing receivable, Related Allowance 1,516 1,565
Consumer home equity    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Recorded Investment 2,370 2,571
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 2,370 2,571
Impaired financing receivable, with no related allowance, Recorded Investment 2,091 2,274
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 2,091 2,274
Impaired financing receivable, Related Allowance 263 289
Other consumer    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Recorded Investment 26 29
Impaired financing receivable, with no related allowance, Unpaid Principal Balance $ 26 $ 29