Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	$ 2,307	$ 3,118
Allowance for loans collectively evaluated for impairment	116,391	114,672
Allowance for loan commitments	9,127	8,368	$ 8,050	$ 7,775
Total allowance for credit losses - loans and commitments	127,825	126,158	125,915	129,397
Individually evaluated for credit loss	27,762	50,399
Collectively-evaluated for credit losses	10,860,926	10,652,329
Total loans	10,888,688	10,702,728
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	120	130
Allowance for loans collectively evaluated for impairment	28,451	31,410
Allowance for loan commitments	797		670	1,497
Total allowance for credit losses - loans and commitments	29,368	31,540	26,205	28,372
Individually evaluated for credit loss	358	401
Collectively-evaluated for credit losses	1,519,450	1,578,994
Total loans	1,519,808	1,579,395
Deposit Overdrafts [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	921	1,285
Total allowance for credit losses - loans and commitments	921	1,285	1,608	2,220
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	6,197,844	6,061,344
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	5,148	6,737
Allowance for loan commitments	5,974	6,025	4,931	4,180
Total allowance for credit losses - loans and commitments	11,122	12,762	12,509	11,490
Individually evaluated for credit loss		24,629
Collectively-evaluated for credit losses	731,173	919,258
Total loans	731,173	943,887
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	2,187	2,988
Allowance for loans collectively evaluated for impairment	51,901	49,671
Allowance for loan commitments			320	201
Total allowance for credit losses - loans and commitments	54,088	52,659	65,329	65,556
Individually evaluated for credit loss	27,404	25,369
Collectively-evaluated for credit losses	5,439,267	5,092,088
Total loans	5,466,671	5,117,457
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	22,703	18,208
Allowance for loan commitments	2,205	2,215	1,740	1,576
Total allowance for credit losses - loans and commitments	24,908	20,423	15,454	16,977
Collectively-evaluated for credit losses	2,251,423	2,140,584
Total loans	2,251,423	2,140,584
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	3,070	3,127
Allowance for loan commitments			331	272
Total allowance for credit losses - loans and commitments	3,070	3,127	4,077	4,009
Collectively-evaluated for credit losses	227,612	226,340
Total loans	227,612	226,340
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	4,197	4,234
Allowance for loan commitments	151	128	58	49
Total allowance for credit losses - loans and commitments	4,348	4,362	$ 733	$ 773
Collectively-evaluated for credit losses	692,001	695,065
Total loans	$ 692,001	$ 695,065

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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