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Loans and Allowance for Loan Losses - Summary of Information Regarding Interest Income Recognized on Impaired Loans,by Portfolio (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]      
Impaired financing receivable, with no related allowance, Average Recorded Investment $ 34,637 $ 39,062 $ 48,124
Impaired financing receivable, with no related allowance, Total Interest Recognized 956 1,154 1,659
Impaired financing receivable, with related allowance, Average Recorded Investment 35,673 36,782 28,738
Impaired financing receivable, with related allowance, Total Interest Recognized 596 660 713
Impaired financing receivable, Average Recorded Investment 70,310 75,844 76,862
Impaired financing receivable, Total Interest Recognized 1,552 1,814 2,372
Commercial and industrial | Commercial Portfolio Segment      
Financing Receivable, Impaired [Line Items]      
Impaired financing receivable, with no related allowance, Average Recorded Investment 11,813 12,941 17,695
Impaired financing receivable, with no related allowance, Total Interest Recognized 161 206 615
Impaired financing receivable, with related allowance, Average Recorded Investment 7,229 7,947 6,141
Impaired financing receivable, with related allowance, Total Interest Recognized 0 0 0
Commercial real estate | Commercial Portfolio Segment      
Financing Receivable, Impaired [Line Items]      
Impaired financing receivable, with no related allowance, Average Recorded Investment 3,916 5,124 9,987
Impaired financing receivable, with no related allowance, Total Interest Recognized 178 179 179
Impaired financing receivable, with related allowance, Average Recorded Investment 926 644 391
Impaired financing receivable, with related allowance, Total Interest Recognized 0 0 0
Business banking | Commercial Portfolio Segment      
Financing Receivable, Impaired [Line Items]      
Impaired financing receivable, with no related allowance, Average Recorded Investment 4,352 3,008 2,072
Impaired financing receivable, with no related allowance, Total Interest Recognized 99 92 70
Impaired financing receivable, with related allowance, Average Recorded Investment 13,027 13,663 7,730
Impaired financing receivable, with related allowance, Total Interest Recognized 57 62 86
Residential real estate | Residential Portfolio Segment      
Financing Receivable, Impaired [Line Items]      
Impaired financing receivable, with no related allowance, Average Recorded Investment 12,506 14,654 15,501
Impaired financing receivable, with no related allowance, Total Interest Recognized 456 589 671
Impaired financing receivable, with related allowance, Average Recorded Investment 12,322 12,194 12,215
Impaired financing receivable, with related allowance, Total Interest Recognized 474 521 528
Consumer home equity | Consumer Portfolio Segment      
Financing Receivable, Impaired [Line Items]      
Impaired financing receivable, with no related allowance, Average Recorded Investment 2,027 3,299 2,869
Impaired financing receivable, with no related allowance, Total Interest Recognized 62 87 124
Impaired financing receivable, with related allowance, Average Recorded Investment 2,106 2,334 2,261
Impaired financing receivable, with related allowance, Total Interest Recognized 65 77 99
Other consumer | Consumer Portfolio Segment      
Financing Receivable, Impaired [Line Items]      
Impaired financing receivable, with no related allowance, Average Recorded Investment 23 36 0
Impaired financing receivable, with no related allowance, Total Interest Recognized 0 1 0
Impaired financing receivable, with related allowance, Average Recorded Investment 63 0 0
Impaired financing receivable, with related allowance, Total Interest Recognized $ 0 $ 0 $ 0