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Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	$ 3,118	$ 9,274
Allowance for loans collectively evaluated for impairment	114,672	112,348
Allowance for loan commitments	8,368	7,775	$ 9,514	$ 874
Total allowance for credit losses - loans and commitments	126,158	129,397	195,341	53,303
Individually evaluated for credit loss	50,399	68,459
Collectively-evaluated for credit losses	10,652,329	9,665,019
Total loans	10,702,728	9,733,478
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	130	333
Allowance for loans collectively evaluated for impairment	31,410	26,542
Allowance for loan commitments		1,497	1,275	311
Total allowance for credit losses - loans and commitments	31,540	28,372	39,125	14,427
Individually evaluated for credit loss	401	576
Collectively-evaluated for credit losses	1,578,994	1,589,744
Total loans	1,579,395	1,590,320
Deposit Overdraft [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	1,285	2,220
Total allowance for credit losses - loans and commitments	1,285	2,220	639	1,387
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	6,061,344	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		381
Allowance for loans collectively evaluated for impairment	6,737	6,929
Allowance for loan commitments	6,025	4,180	6,508	235
Total allowance for credit losses - loans and commitments	12,762	11,490	17,349	5,184
Individually evaluated for credit loss	24,629	1,248
Collectively-evaluated for credit losses	919,258	832,632
Total loans	943,887	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	2,988	8,560
Allowance for loans collectively evaluated for impairment	49,671	56,795
Allowance for loan commitments		201	712	22
Total allowance for credit losses - loans and commitments	52,659	65,556	111,364	20,315
Individually evaluated for credit loss	25,369	66,635
Collectively-evaluated for credit losses	5,092,088	4,638,453
Total loans	5,117,457	4,705,088
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	18,208	15,401
Allowance for loan commitments	2,215	1,576	955	15
Total allowance for credit losses - loans and commitments	20,423	16,977	18,806	4,326
Collectively-evaluated for credit losses	2,140,584	1,721,378
Total loans	2,140,584	1,721,378
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	3,127	3,737
Allowance for loan commitments		272	19	41
Total allowance for credit losses - loans and commitments	3,127	4,009	6,526	2,992
Collectively-evaluated for credit losses	226,340	277,130
Total loans	226,340	277,130
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	4,234	724
Allowance for loan commitments	128	49	45	250
Total allowance for credit losses - loans and commitments	4,362	773	$ 1,532	$ 4,672
Collectively-evaluated for credit losses	695,065	605,682
Total loans	$ 695,065	$ 605,682

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