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Loans and the Allowance for Credit Losses - Summary of Age Analysis of Loan Categories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income $ 9,733,478 $ 10,789,233
90 Days or More Past Due and Accruing 7,804 8,846
Loans held for sale, current   168,378
Loans held for sale 25,277 168,378
Total loans, current 9,698,760 10,889,462
Total loans 9,758,755 10,957,611
Total Non-performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 39,488 40,807
Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 605,682 646,387
90 Days or More Past Due and Accruing 685 706
Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 5,538,968 5,705,392
90 Days or More Past Due and Accruing 3,093 3,001
Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 1,721,378 1,720,961
90 Days or More Past Due and Accruing 2,840 2,863
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 277,130 309,055
90 Days or More Past Due and Accruing 627 377
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 833,880 668,277
90 Days or More Past Due and Accruing 51 288
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 4,705,088 5,037,115
90 Days or More Past Due and Accruing 3,042 2,713
Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 1,590,320 2,407,438
90 Days or More Past Due and Accruing 559 1,899
Non-Accrual Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 35,742 36,880
TDRs Accruing Interest [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 3,746 3,927
Current [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 9,673,483 10,721,084
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 14,449 13,100
Current [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 599,189 639,319
Current [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 5,514,783 5,681,802
Current [Member] | Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 1,702,587 1,698,636
Current [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 273,577 305,483
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 833,755 664,990
Current [Member] | Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 4,681,028 5,016,812
Current [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 1,583,347 2,395,844
Current [Member] | Non-Accrual Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 11,174 9,560
Current [Member] | TDRs Accruing Interest [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 3,275 3,540
30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 14,755 16,856
30-59 Days Past Due [Member] | Total Non-performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 917 693
30-59 Days Past Due [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 2,240 2,414
30-59 Days Past Due [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 6,377 5,458
30-59 Days Past Due [Member] | Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 2,331 2,614
30-59 Days Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 1,532 1,998
30-59 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   582
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 6,377 4,876
30-59 Days Past Due [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 2,275 4,372
30-59 Days Past Due [Member] | Non-Accrual Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 914 630
30-59 Days Past Due [Member] | TDRs Accruing Interest [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 3 63
60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 14,005 16,051
60-89 Days Past Due [Member] | Total Non-performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 691  
60-89 Days Past Due [Member] | Total Impaired [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income   618
60-89 Days Past Due [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 602 775
60-89 Days Past Due [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 7,728 6,394
60-89 Days Past Due [Member] | Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 3,254 5,654
60-89 Days Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 1,208 1,031
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   2,276
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 7,728 4,118
60-89 Days Past Due [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 1,213 2,197
60-89 Days Past Due [Member] | Non-Accrual Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 564 466
60-89 Days Past Due [Member] | TDRs Accruing Interest [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 127 152
90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 31,235 35,242
90 Days or More Past Due [Member] | Total Non-performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 23,431 26,396
90 Days or More Past Due [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 3,651 3,879
90 Days or More Past Due [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 10,080 11,738
90 Days or More Past Due [Member] | Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 13,206 14,057
90 Days or More Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 813 543
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 125 429
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 9,955 11,309
90 Days or More Past Due [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 3,485 5,025
90 Days or More Past Due [Member] | Non-Accrual Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 23,090 26,224
90 Days or More Past Due [Member] | TDRs Accruing Interest [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 341 172
Total Past Due [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 59,995 68,149
Total Past Due [Member] | Total Non-performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 25,039 27,707
Total Past Due [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 6,493 7,068
Total Past Due [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 24,185 23,590
Total Past Due [Member] | Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 18,791 22,325
Total Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 3,553 3,572
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 125 3,287
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 24,060 20,303
Total Past Due [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 6,973 11,594
Total Past Due [Member] | Non-Accrual Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income 24,568 27,320
Total Past Due [Member] | TDRs Accruing Interest [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Portfolio loans, net of unearned income $ 471 $ 387