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Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | $ 6,039 | $ 6,282 |  |
Allowance for loans collectively evaluated for impairment | 154,001 | 179,545 |  |
Allowance for loan commitments | 6,731 | 9,514 | $ 5,572 | $ 874
Total allowance for credit losses - loans and commitments | 166,771 | 195,341 | 119,844 | 53,303
Individually evaluated for credit loss | 43,121 | 44,690 |  |
Collectively-evaluated for credit losses | 10,660,191 | 10,744,543 |  |
Total loans | 10,703,312 | 10,789,233 |  |
Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | 1,501 | 1,484 |  |
Allowance for loans collectively evaluated for impairment | 31,783 | 36,366 |  |
Allowance for loan commitments | 1,583 | 1,275 |  | 311
Total allowance for credit losses - loans and commitments | 34,867 | 39,125 | 39,227 | 14,427
Individually evaluated for credit loss | 1,838 | 2,863 |  |
Collectively-evaluated for credit losses | 2,420,897 | 2,404,575 |  |
Total loans | 2,422,735 | 2,407,438 |  |
Deposit Overdrafts [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 707 | 639 |  |
Total allowance for credit losses - loans and commitments | 707 | 639 | 1,064 | 1,387
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans | 5,712,742 | 5,705,392 |  |
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | 503 | 602 |  |
Allowance for loans collectively evaluated for impairment | 6,837 | 10,239 |  |
Allowance for loan commitments | 4,000 | 6,508 | 5,111 | 235
Total allowance for credit losses - loans and commitments | 11,340 | 17,349 | 11,553 | 5,184
Individually evaluated for credit loss | 1,125 | 1,455 |  |
Collectively-evaluated for credit losses | 640,892 | 666,822 |  |
Total loans | 642,017 | 668,277 |  |
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans individually evaluated for impairment | 4,035 | 4,196 |  |
Allowance for loans collectively evaluated for impairment | 95,706 | 106,456 |  |
Allowance for loan commitments | 208 | 712 |  | 22
Total allowance for credit losses - loans and commitments | 99,949 | 111,364 | 52,873 | 20,315
Individually evaluated for credit loss | 40,158 | 40,372 |  |
Collectively-evaluated for credit losses | 5,030,567 | 4,996,743 |  |
Total loans | 5,070,725 | 5,037,115 |  |
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 13,438 | 17,851 |  |
Allowance for loan commitments | 869 | 955 | 444 | 15
Total allowance for credit losses - loans and commitments | 14,307 | 18,806 | 10,128 | 4,326
Collectively-evaluated for credit losses | 1,644,422 | 1,720,961 |  |
Total loans | 1,644,422 | 1,720,961 |  |
Consumer [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 4,532 | 6,507 |  |
Allowance for loan commitments | 21 | 19 |  | 41
Total allowance for credit losses - loans and commitments | 4,553 | 6,526 | 3,886 | 2,992
Collectively-evaluated for credit losses | 289,395 | 309,055 |  |
Total loans | 289,395 | 309,055 |  |
Home Equity [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loans collectively evaluated for impairment | 998 | 1,487 |  |
Allowance for loan commitments | 50 | 45 | 17 | 250
Total allowance for credit losses - loans and commitments | 1,048 | 1,532 | $ 1,113 | $ 4,672
Collectively-evaluated for credit losses | 634,018 | 646,387 |  |
Total loans | $ 634,018 | $ 646,387 |  |

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