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Loans and the Allowance for Credit Losses - Summary of Age Analysis of Loan Categories (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | $ 10,702,728 | $ 9,733,478
90 Days or More Past Due and Accruing | 5,443 | 7,804
Loans held for sale, current | 8,249 |
Loans held for sale | 8,249 | 25,277
Total loans, current | 10,662,148 | 9,698,760
Total loans | 10,710,977 | 9,758,755
Total Non-performing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 41,415 | 39,488
Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 695,065 | 605,682
90 Days or More Past Due and Accruing | 1,063 | 685
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 6,061,344 | 5,538,968
90 Days or More Past Due and Accruing | 713 | 3,093
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 2,140,584 | 1,721,378
90 Days or More Past Due and Accruing | 1,551 | 2,840
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 226,340 | 277,130
90 Days or More Past Due and Accruing | 530 | 627
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 943,887 | 833,880
90 Days or More Past Due and Accruing | 629 | 51
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 5,117,457 | 4,705,088
90 Days or More Past Due and Accruing | 84 | 3,042
Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 1,579,395 | 1,590,320
90 Days or More Past Due and Accruing | 1,586 | 559
Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 38,185 | 35,742
TDRs Accruing Interest [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 3,230 | 3,746
Current [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 10,653,899 | 9,673,483
Loans held for sale, current |  | 25,277
Current [Member] | Total Non-performing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 13,468 | 14,449
Current [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 686,762 | 599,189
Current [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 6,041,578 | 5,514,783
Current [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 2,129,095 | 1,702,587
Current [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 222,153 | 273,577
Current [Member] | Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 942,236 | 833,755
Current [Member] | Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 5,099,342 | 4,681,028
Current [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 1,574,311 | 1,583,347
Current [Member] | Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 10,337 | 11,174
Current [Member] | TDRs Accruing Interest [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 3,131 | 3,275
30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 11,222 | 14,755
30-59 Days Past Due [Member] | Total Non-performing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 1,502 | 917
30-59 Days Past Due [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 3,885 | 2,240
30-59 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 2,147 | 6,377
30-59 Days Past Due [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 853 | 2,331
30-59 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 2,910 | 1,532
30-59 Days Past Due [Member] | Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 2,147 | 6,377
30-59 Days Past Due [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 1,427 | 2,275
30-59 Days Past Due [Member] | Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 1,495 | 914
30-59 Days Past Due [Member] | TDRs Accruing Interest [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 7 | 3
60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 6,621 | 14,005
60-89 Days Past Due [Member] | Total Non-performing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 902 | 691
60-89 Days Past Due [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 621 | 602
60-89 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 1,241 | 7,728
60-89 Days Past Due [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 3,536 | 3,254
60-89 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 704 | 1,208
60-89 Days Past Due [Member] | Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 910 |
60-89 Days Past Due [Member] | Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 331 | 7,728
60-89 Days Past Due [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 519 | 1,213
60-89 Days Past Due [Member] | Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 870 | 564
60-89 Days Past Due [Member] | TDRs Accruing Interest [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 32 | 127
90 Days or More Past Due [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 30,986 | 31,235
90 Days or More Past Due [Member] | Total Non-performing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 25,543 | 23,431
90 Days or More Past Due [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 3,797 | 3,651
90 Days or More Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 16,378 | 10,080
90 Days or More Past Due [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 7,100 | 13,206
90 Days or More Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 573 | 813
90 Days or More Past Due [Member] | Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 741 | 125
90 Days or More Past Due [Member] | Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 15,637 | 9,955
90 Days or More Past Due [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 3,138 | 3,485
90 Days or More Past Due [Member] | Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 25,483 | 23,090
90 Days or More Past Due [Member] | TDRs Accruing Interest [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 60 | 341
Total Past Due [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 48,829 | 59,995
Total Past Due [Member] | Total Non-performing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 27,947 | 25,039
Total Past Due [Member] | Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 8,303 | 6,493
Total Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 19,766 | 24,185
Total Past Due [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 11,489 | 18,791
Total Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 4,187 | 3,553
Total Past Due [Member] | Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 1,651 | 125
Total Past Due [Member] | Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 18,115 | 24,060
Total Past Due [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 5,084 | 6,973
Total Past Due [Member] | Non-Accrual Loans [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | 27,848 | 24,568
Total Past Due [Member] | TDRs Accruing Interest [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Portfolio loans, net of unearned income | $ 99 | $ 471

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