Loans and the Allowance for Credit Losses - ACL and Recorded Investment in Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	$ 29,808	$ 27,908
Allowance for loans collectively evaluated for impairment	184,750	190,841
Allowance for loan commitments	9,234	6,950	$ 7,628	$ 6,120
Total allowance for credit losses - loans and commitments	223,792	225,699	225,294	144,886
Individually evaluated for credit loss	75,098	48,975
Collectively-evaluated for credit losses	19,825,453	19,177,457
Total loans	19,900,551	19,226,432
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	4,215	6,918
Allowance for loans collectively evaluated for impairment	63,182	58,014
Allowance for loan commitments	578	552	1,434
Total allowance for credit losses - loans and commitments	67,975	65,484	65,765	42,398
Individually evaluated for credit loss	5,365	6,965
Collectively-evaluated for credit losses	3,062,502	2,856,928
Total loans	3,067,867	2,863,893
Deposit Overdraft [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	1,818	1,855
Total allowance for credit losses - loans and commitments	1,818	1,855	2,134	1,713
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	11,319,515	10,938,834
Commercial Real Estate [Member] \| Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	763
Allowance for loans collectively evaluated for impairment	9,441	10,707
Allowance for loan commitments	7,266	5,499	5,251	5,105
Total allowance for credit losses - loans and commitments	17,470	16,206	15,719	13,516
Individually evaluated for credit loss	26,250
Collectively-evaluated for credit losses	1,611,072	1,783,637
Total loans	1,637,322	1,783,637
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	24,830	20,990
Allowance for loans collectively evaluated for impairment	69,635	75,724
Allowance for loan commitments	263
Total allowance for credit losses - loans and commitments	94,728	96,714	95,879	59,828
Individually evaluated for credit loss	43,483	42,010
Collectively-evaluated for credit losses	9,638,710	9,113,187
Total loans	9,682,193	9,155,197
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	32,303	33,416
Allowance for loan commitments	1,107	890	933	1,015
Total allowance for credit losses - loans and commitments	33,410	34,306	33,938	22,805
Collectively-evaluated for credit losses	3,998,944	3,938,585
Total loans	3,998,944	3,938,585
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	5,987	8,742
Allowance for loan commitments	20	9	10
Total allowance for credit losses - loans and commitments	6,007	8,751	9,611	3,391
Collectively-evaluated for credit losses	273,414	355,726
Total loans	273,414	355,726
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	2,384	2,383
Total allowance for credit losses - loans and commitments	2,384	2,383	$ 2,248	$ 1,235
Collectively-evaluated for credit losses	1,240,811	1,129,394
Total loans	$ 1,240,811	$ 1,129,394

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

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