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Loans and Allowance for Loan Losses - Summary of Shows the Age Analysis of Past Due Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Past Due [Line Items]      
Total loans $ 12,281,510 $ 9,730,525 $ 8,987,046
Recorded Investment > 90 Days and Accruing 1,990 2,247  
Total Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans 79,414 47,622  
30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans 53,510 18,251  
60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans 7,393 7,250  
90 or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
Total loans 18,511 22,121  
Current      
Financing Receivable, Past Due [Line Items]      
Total loans 12,202,096 9,682,903  
Commercial and industrial | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 2,960,527 1,995,016 1,642,184
Recorded Investment > 90 Days and Accruing 0 848  
Commercial and industrial | Total Past Due | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 1,748 2,196  
Commercial and industrial | 30-59 Days Past Due | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 45 4  
Commercial and industrial | 60-89 Days Past Due | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 31 268  
Commercial and industrial | 90 or More Days Past Due | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 1,672 1,924  
Commercial and industrial | Current | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 2,958,779 1,992,820  
Commercial real estate | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 4,522,513 3,573,630 3,535,441
Recorded Investment > 90 Days and Accruing 1,196 1,111  
Commercial real estate | Total Past Due | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 27,127 2,101  
Commercial real estate | 30-59 Days Past Due | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 25,931 0  
Commercial real estate | 60-89 Days Past Due | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 0 556  
Commercial real estate | 90 or More Days Past Due | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 1,196 1,545  
Commercial real estate | Current | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 4,495,386 3,571,529  
Commercial construction | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 222,328 305,708 273,774
Recorded Investment > 90 Days and Accruing 0 0  
Commercial construction | Total Past Due | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 0 0  
Commercial construction | 30-59 Days Past Due | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 0 0  
Commercial construction | 60-89 Days Past Due | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 0 0  
Commercial construction | 90 or More Days Past Due | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 0 0  
Commercial construction | Current | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 222,328 305,708  
Business banking | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 1,334,694 1,339,164  
Recorded Investment > 90 Days and Accruing 0 0  
Business banking | Total Past Due | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 11,476 18,786  
Business banking | 30-59 Days Past Due | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 5,043 5,279  
Business banking | 60-89 Days Past Due | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 1,793 3,311  
Business banking | 90 or More Days Past Due | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 4,640 10,196  
Business banking | Current | Commercial Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 1,323,218 1,320,378  
Residential real estate | Residential Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 1,926,810 1,370,957  
Recorded Investment > 90 Days and Accruing 769 279  
Residential real estate | Total Past Due | Residential Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 26,577 16,605  
Residential real estate | 30-59 Days Past Due | Residential Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 17,523 9,184  
Residential real estate | 60-89 Days Past Due | Residential Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 3,511 2,517  
Residential real estate | 90 or More Days Past Due | Residential Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 5,543 4,904  
Residential real estate | Current | Residential Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 1,900,233 1,354,352  
Consumer home equity | Consumer Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 1,100,153 868,270 933,088
Recorded Investment > 90 Days and Accruing 25 9  
Consumer home equity | Total Past Due | Consumer Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 9,855 5,205  
Consumer home equity | 30-59 Days Past Due | Consumer Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 3,774 1,806  
Consumer home equity | 60-89 Days Past Due | Consumer Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 1,510 364  
Consumer home equity | 90 or More Days Past Due | Consumer Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 4,571 3,035  
Consumer home equity | Current | Consumer Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 1,090,298 863,065  
Other consumer | Consumer Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 214,485 277,780 $ 402,431
Recorded Investment > 90 Days and Accruing 0 0  
Other consumer | Total Past Due | Consumer Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 2,631 2,729  
Other consumer | 30-59 Days Past Due | Consumer Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 1,194 1,978  
Other consumer | 60-89 Days Past Due | Consumer Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 548 234  
Other consumer | 90 or More Days Past Due | Consumer Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans 889 517  
Other consumer | Current | Consumer Portfolio Segment      
Financing Receivable, Past Due [Line Items]      
Total loans $ 211,854 $ 275,051