Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	$ 24,109	$ 17,814
Allowance for loans collectively evaluated for impairment	209,508	120,952
Allowance for loan commitments	6,459	6,120	$ 8,175	$ 8,604
Total allowance for credit losses - loans and commitments	240,076	144,886	137,365	139,279
Individually evaluated for credit loss	48,055	52,340
Collectively-evaluated for credit losses	18,625,693	12,604,089
Total loans	18,673,748	12,656,429
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	6,014	5,353
Allowance for loans collectively evaluated for impairment	72,749	37,045
Allowance for loan commitments			553	429
Total allowance for credit losses - loans and commitments	78,763	42,398	38,594	37,073
Individually evaluated for credit loss	6,965	7,116
Collectively-evaluated for credit losses	2,774,763	1,780,161
Total loans	2,781,728	1,787,277
Deposit Overdraft [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	1,750	1,713
Total allowance for credit losses - loans and commitments	1,750	1,713	1,235	1,366
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	10,501,846	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	11,335	8,411
Allowance for loan commitments	5,616	5,105	6,326	6,894
Total allowance for credit losses - loans and commitments	16,951	13,516	13,494	14,017
Collectively-evaluated for credit losses	1,779,108	1,352,083
Total loans	1,779,108	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	18,095	12,461
Allowance for loans collectively evaluated for impairment	76,448	47,367
Total allowance for credit losses - loans and commitments	94,543	59,828	56,104	59,351
Individually evaluated for credit loss	41,090	45,224
Collectively-evaluated for credit losses	8,681,648	5,929,374
Total loans	8,722,738	5,974,598
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	32,625	21,790
Allowance for loan commitments	832	1,015	1,285	1,276
Total allowance for credit losses - loans and commitments	33,457	22,805	23,052	22,494
Collectively-evaluated for credit losses	3,930,667	2,520,086
Total loans	3,930,667	2,520,086
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	12,436	3,391
Allowance for loan commitments	11
Total allowance for credit losses - loans and commitments	12,447	3,391	3,851	3,956
Collectively-evaluated for credit losses	438,578	201,275
Total loans	438,578	201,275
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	2,165	1,235
Allowance for loan commitments			11	5
Total allowance for credit losses - loans and commitments	2,165	1,235	$ 1,035	$ 1,022
Collectively-evaluated for credit losses	1,020,929	821,110
Total loans	$ 1,020,929	$ 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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