Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	$ 8,782	$ 5,745
Allowance for loans collectively evaluated for impairment	127,727	124,930
Allowance for loan commitments	9,194	8,604	$ 10,124	$ 8,368
Total allowance for credit losses - loans and commitments	145,703	139,279	130,290	126,158
Individually evaluated for credit loss	40,124	37,045
Collectively-evaluated for credit losses	12,217,387	11,601,416
Total loans	12,257,511	11,638,461
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	3,344
Allowance for loans collectively evaluated for impairment	38,061	36,644
Allowance for loan commitments	0	429	527
Total allowance for credit losses - loans and commitments	41,405	37,073	32,664	31,540
Individually evaluated for credit loss	3,916	116
Collectively-evaluated for credit losses	1,756,563	1,670,543
Total loans	1,760,479	1,670,659
Deposit Overdraft [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	1,551	1,366
Total allowance for credit losses - loans and commitments	1,551	1,366	1,095	1,285
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	6,998,888	6,565,448
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	7,826	7,123
Allowance for loan commitments	7,940	6,894	7,193	6,025
Total allowance for credit losses - loans and commitments	15,766	14,017	12,991	12,762
Collectively-evaluated for credit losses	1,061,390	1,055,865
Total loans	1,061,390	1,055,865
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	5,438	5,745
Allowance for loans collectively evaluated for impairment	53,139	53,606
Allowance for loan commitments			182
Total allowance for credit losses - loans and commitments	58,577	59,351	53,133	52,659
Individually evaluated for credit loss	36,208	36,929
Collectively-evaluated for credit losses	5,901,290	5,472,654
Total loans	5,937,498	5,509,583
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	22,403	21,218
Allowance for loan commitments	1,254	1,276	1,594	2,215
Total allowance for credit losses - loans and commitments	23,657	22,494	21,909	20,423
Collectively-evaluated for credit losses	2,506,957	2,438,574
Total loans	2,506,957	2,438,574
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	3,643	3,956
Total allowance for credit losses - loans and commitments	3,643	3,956	3,450	3,127
Collectively-evaluated for credit losses	220,588	229,561
Total loans	220,588	229,561
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	1,104	1,017
Allowance for loan commitments	0	5	628	128
Total allowance for credit losses - loans and commitments	1,104	1,022	$ 5,048	$ 4,362
Collectively-evaluated for credit losses	770,599	734,219
Total loans	$ 770,599	$ 734,219

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

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