Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	$ 9,671	$ 9,274
Allowance for loans collectively evaluated for impairment	107,732	112,348
Allowance for loan commitments	7,718	7,775	$ 5,766	$ 9,514
Total allowance for credit losses - loans and commitments	125,121	129,397	146,496	195,341
Individually evaluated for credit loss	54,640	68,459
Collectively-evaluated for credit losses	10,154,049	9,665,019
Total loans	10,208,689	9,733,478
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	238	333
Allowance for loans collectively evaluated for impairment	27,930	26,542
Allowance for loan commitments	209	1,497	941	1,275
Total allowance for credit losses - loans and commitments	28,377	28,372	30,405	39,125
Individually evaluated for credit loss	472	576
Collectively-evaluated for credit losses	1,549,296	1,589,744
Total loans	1,549,768	1,590,320
Deposit Overdrafts [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	1,559	2,220
Total allowance for credit losses - loans and commitments	1,559	2,220	1,056	639
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	5,852,564	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	302	381
Allowance for loans collectively evaluated for impairment	7,805	6,929
Allowance for loan commitments	4,876	4,180	3,579	6,508
Total allowance for credit losses - loans and commitments	12,983	11,490	9,768	17,349
Individually evaluated for credit loss	1,160	1,248
Collectively-evaluated for credit losses	918,256	832,632
Total loans	919,416	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	9,131	8,560
Allowance for loans collectively evaluated for impairment	50,426	56,795
Allowance for loan commitments		201	94	712
Total allowance for credit losses - loans and commitments	59,557	65,556	85,485	111,364
Individually evaluated for credit loss	53,008	66,635
Collectively-evaluated for credit losses	4,880,140	4,638,453
Total loans	4,933,148	4,705,088
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	14,931	15,401
Allowance for loan commitments	2,158	1,576	1,066	955
Total allowance for credit losses - loans and commitments	17,089	16,977	14,683	18,806
Collectively-evaluated for credit losses	1,907,875	1,721,378
Total loans	1,907,875	1,721,378
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	4,304	3,737
Allowance for loan commitments	412	272	36	19
Total allowance for credit losses - loans and commitments	4,716	4,009	4,215	6,526
Collectively-evaluated for credit losses	300,637	277,130
Total loans	300,637	277,130
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	777	724
Allowance for loan commitments	63	49	50	45
Total allowance for credit losses - loans and commitments	840	773	$ 884	$ 1,532
Collectively-evaluated for credit losses	597,845	605,682
Total loans	$ 597,845	$ 605,682

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

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