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Loans and Allowance for Loan Losses - Summary of Company's Impaired Loans by Loan Portfolio (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Recorded Investment $ 33,187 $ 35,717
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 36,330 42,455
Impaired financing receivable, with no related allowance, Recorded Investment 25,017 39,892
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 28,786 44,675
Impaired financing receivable, Related Allowance 3,970 8,054
Impaired financing receivable, Recorded Investment 58,204 75,609
Impaired financing receivable, Unpaid Principal Balance 65,116 87,130
Commercial and industrial | Commercial Portfolio Segment    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Recorded Investment 12,309 9,182
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 13,212 11,212
Impaired financing receivable, with no related allowance, Recorded Investment 3,836 8,161
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 4,226 8,432
Impaired financing receivable, Related Allowance 1,540 4,555
Commercial real estate | Commercial Portfolio Segment    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Recorded Investment 3,520 3,955
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 3,520 3,974
Impaired financing receivable, with no related allowance, Recorded Investment 0 480
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 0 497
Impaired financing receivable, Related Allowance 0 210
Business banking | Commercial Portfolio Segment    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Recorded Investment 4,199 5,250
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 5,069 7,659
Impaired financing receivable, with no related allowance, Recorded Investment 7,861 16,651
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 11,240 21,146
Impaired financing receivable, Related Allowance 450 1,435
Residential real estate | Residential Portfolio Segment    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Recorded Investment 11,217 14,730
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 12,587 17,010
Impaired financing receivable, with no related allowance, Recorded Investment 11,161 12,326
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 11,161 12,326
Impaired financing receivable, Related Allowance 1,549 1,565
Consumer home equity | Consumer Portfolio Segment    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Recorded Investment 1,924 2,571
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 1,924 2,571
Impaired financing receivable, with no related allowance, Recorded Investment 1,998 2,274
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 1,998 2,274
Impaired financing receivable, Related Allowance 270 289
Other consumer | Consumer Portfolio Segment    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Recorded Investment 18 29
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 18 29
Impaired financing receivable, with no related allowance, Recorded Investment 161 0
Impaired financing receivable, with no related allowance, Unpaid Principal Balance 161 0
Impaired financing receivable, Related Allowance $ 161 $ 0