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Loans and the Allowance for Credit Losses - Schedule of Recorded Investment in Loans by Category (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | $ 10,703,312 | $ 10,789,233
Loans held for sale | 153,520 | 168,378
Total loans | 10,856,832 | 10,957,611
Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 1,598,921 | 1,681,182
Commercial And Industrial - PPP [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 823,814 | 726,256
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 5,712,742 | 5,705,392
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 642,017 | 668,277
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 5,070,725 | 5,037,115
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 1,644,422 | 1,720,961
Consumer [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | 289,395 | 309,055
Home Equity [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total portfolio loans | $ 634,018 | $ 646,387

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