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Loans and the Allowance for Credit Losses - Schedule of Recorded Investment in Loans by Category (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	$ 18,932,074	$ 12,656,429
Loans held for sale	125,971	18,695
Total loans	19,058,045	12,675,124
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	2,771,906	1,787,277
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	10,755,370	7,326,681
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	1,826,642	1,352,083
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	8,928,728	5,974,598
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	3,928,469	2,520,086
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	384,693	201,275
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	$ 1,091,636	$ 821,110

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