Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	$ 4,421	$ 9,274
Allowance for loans collectively evaluated for impairment	110,163	112,348
Allowance for loan commitments	8,938	7,775	$ 7,290	$ 9,514
Total allowance for credit losses - loans and commitments	123,522	129,397	143,895	195,341
Individually evaluated for credit loss	32,284	68,459
Collectively-evaluated for credit losses	10,245,378	9,665,019
Total loans	10,277,662	9,733,478
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	184	333
Allowance for loans collectively evaluated for impairment	28,739	26,542
Allowance for loan commitments	283	1,497	1,726	1,275
Total allowance for credit losses - loans and commitments	29,206	28,372	28,927	39,125
Individually evaluated for credit loss	437	576
Collectively-evaluated for credit losses	1,516,419	1,589,744
Total loans	1,516,856	1,590,320
Deposit Overdrafts [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	1,543	2,220
Total allowance for credit losses - loans and commitments	1,543	2,220	1,680	639
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	5,831,384	5,538,968
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	297	381
Allowance for loans collectively evaluated for impairment	8,334	6,929
Allowance for loan commitments	5,798	4,180	3,679	6,508
Total allowance for credit losses - loans and commitments	14,429	11,490	10,943	17,349
Individually evaluated for credit loss	1,115	1,248
Collectively-evaluated for credit losses	954,529	832,632
Total loans	955,644	833,880
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	3,940	8,560
Allowance for loans collectively evaluated for impairment	49,590	56,795
Allowance for loan commitments		201	318	712
Total allowance for credit losses - loans and commitments	53,530	65,556	81,919	111,364
Individually evaluated for credit loss	30,732	66,635
Collectively-evaluated for credit losses	4,845,008	4,638,453
Total loans	4,875,740	4,705,088
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	16,735	15,401
Allowance for loan commitments	2,364	1,576	1,209	955
Total allowance for credit losses - loans and commitments	19,099	16,977	15,622	18,806
Collectively-evaluated for credit losses	2,010,344	1,721,378
Total loans	2,010,344	1,721,378
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	4,434	3,737
Allowance for loan commitments	437	272	306	19
Total allowance for credit losses - loans and commitments	4,871	4,009	4,053	6,526
Collectively-evaluated for credit losses	309,313	277,130
Total loans	309,313	277,130
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	788	724
Allowance for loan commitments	56	49	52	45
Total allowance for credit losses - loans and commitments	844	773	$ 751	$ 1,532
Collectively-evaluated for credit losses	609,765	605,682
Total loans	$ 609,765	$ 605,682

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

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