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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, 2025	Dec. 31, 2024
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	$ 18,673,748	$ 12,656,429
Loans held for sale	243,281	18,695
Total loans	18,917,029	12,675,124
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	2,781,728	1,787,277
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	10,501,846	7,326,681
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	1,779,108	1,352,083
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	8,722,738	5,974,598
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	3,930,667	2,520,086
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	438,578	201,275
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	$ 1,020,929	$ 821,110

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