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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
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Average Recorded Investment $ 36,212 $ 49,087
Impaired financing receivable, with no related allowance, Total Interest Recognized 280 344
Impaired financing receivable, with related allowance, Average Recorded Investment 39,345 35,444
Impaired financing receivable, with related allowance, Total Interest Recognized 159 183
Impaired financing receivable, Average Recorded Investment 75,557 84,531
Impaired financing receivable, Total Interest Recognized 439 527
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Average Recorded Investment 9,899 20,880
Impaired financing receivable, with no related allowance, Total Interest Recognized 46 70
Impaired financing receivable, with related allowance, Average Recorded Investment 7,965 11,730
Impaired financing receivable, with related allowance, Total Interest Recognized 0 0
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Average Recorded Investment 4,176 7,491
Impaired financing receivable, with no related allowance, Total Interest Recognized 44 44
Impaired financing receivable, with related allowance, Average Recorded Investment 657 348
Impaired financing receivable, with related allowance, Total Interest Recognized 0 0
Business banking    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Average Recorded Investment 5,024 2,286
Impaired financing receivable, with no related allowance, Total Interest Recognized 26 17
Impaired financing receivable, with related allowance, Average Recorded Investment 16,325 8,782
Impaired financing receivable, with related allowance, Total Interest Recognized 14 15
Residential real estate    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Average Recorded Investment 14,648 14,801
Impaired financing receivable, with no related allowance, Total Interest Recognized 144 173
Impaired financing receivable, with related allowance, Average Recorded Investment 12,248 11,727
Impaired financing receivable, with related allowance, Total Interest Recognized 127 137
Consumer home equity    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Average Recorded Investment 2,438 3,606
Impaired financing receivable, with no related allowance, Total Interest Recognized 20 40
Impaired financing receivable, with related allowance, Average Recorded Investment 2,150 2,857
Impaired financing receivable, with related allowance, Total Interest Recognized 18 31
Other consumer    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, with no related allowance, Average Recorded Investment 27 23
Impaired financing receivable, with no related allowance, Total Interest Recognized $ 0 $ 0