Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	$ 24,918	$ 17,814
Allowance for loans collectively evaluated for impairment	192,748	120,952
Allowance for loan commitments	7,628	6,120	$ 8,225	$ 8,604
Total allowance for credit losses - loans and commitments	225,294	144,886	149,097	139,279
Individually evaluated for credit loss	56,747	52,340
Collectively-evaluated for credit losses	18,875,327	12,604,089
Total loans	18,932,074	12,656,429
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	6,811	5,353
Allowance for loans collectively evaluated for impairment	57,520	37,045
Allowance for loan commitments	1,434		129	429
Total allowance for credit losses - loans and commitments	65,765	42,398	41,501	37,073
Individually evaluated for credit loss	11,743	7,116
Collectively-evaluated for credit losses	2,760,163	1,780,161
Total loans	2,771,906	1,787,277
Deposit Overdraft [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	2,134	1,713
Total allowance for credit losses - loans and commitments	2,134	1,713	1,498	1,366
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	10,755,370	7,326,681
Commercial Real Estate [Member] \| Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	10,468	8,411
Allowance for loan commitments	5,251	5,105	6,831	6,894
Total allowance for credit losses - loans and commitments	15,719	13,516	15,059	14,017
Collectively-evaluated for credit losses	1,826,642	1,352,083
Total loans	1,826,642	1,352,083
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	18,107	12,461
Allowance for loans collectively evaluated for impairment	77,772	47,367
Allowance for loan commitments			16
Total allowance for credit losses - loans and commitments	95,879	59,828	61,605	59,351
Individually evaluated for credit loss	45,004	45,224
Collectively-evaluated for credit losses	8,883,724	5,929,374
Total loans	8,928,728	5,974,598
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	33,005	21,790
Allowance for loan commitments	933	1,015	1,249	1,276
Total allowance for credit losses - loans and commitments	33,938	22,805	24,746	22,494
Collectively-evaluated for credit losses	3,928,469	2,520,086
Total loans	3,928,469	2,520,086
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	9,601	3,391
Allowance for loan commitments	10
Total allowance for credit losses - loans and commitments	9,611	3,391	3,526	3,956
Collectively-evaluated for credit losses	384,693	201,275
Total loans	384,693	201,275
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	2,248	1,235
Allowance for loan commitments				5
Total allowance for credit losses - loans and commitments	2,248	1,235	$ 1,162	$ 1,022
Collectively-evaluated for credit losses	1,091,636	821,110
Total loans	$ 1,091,636	$ 821,110

Amount of allowance for credit loss on financing receivable evaluated on collective basis. Excludes financing receivable evaluated on individual basis.

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