Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	$ 9,274	$ 6,282
Allowance for loans collectively evaluated for impairment	112,348	179,545
Allowance for loan commitments	7,775	9,514	$ 874	$ 741
Total allowance for credit losses - loans and commitments	129,397	195,341	53,303	49,689
Individually evaluated for credit loss	68,459	44,690
Collectively-evaluated for credit losses	9,665,019	10,744,543
Total loans	9,733,478	10,789,233
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	333	1,484
Allowance for loans collectively evaluated for impairment	26,542	36,366
Allowance for loan commitments	1,497	1,275	311	262
Total allowance for credit losses - loans and commitments	28,372	39,125	14,427	12,376
Individually evaluated for credit loss	576	2,863
Collectively-evaluated for credit losses	1,589,744	2,404,575
Total loans	1,590,320	2,407,438
Deposit Overdraft [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	2,220	639
Total allowance for credit losses - loans and commitments	2,220	639	1,387	972
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	5,538,968	5,705,392
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	602
Allowance for loans collectively evaluated for impairment	6,929	10,239
Allowance for loan commitments	4,180	6,508	235	169
Total allowance for credit losses - loans and commitments	11,490	17,349	5,184	4,208
Individually evaluated for credit loss	1,248	1,455
Collectively-evaluated for credit losses	832,632	666,822
Total loans	833,880	668,277
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	8,560	4,196
Allowance for loans collectively evaluated for impairment	56,795	106,456
Allowance for loan commitments	201	712	22	33
Total allowance for credit losses - loans and commitments	65,556	111,364	20,315	20,881
Individually evaluated for credit loss	66,635	40,372
Collectively-evaluated for credit losses	4,638,453	4,996,743
Total loans	4,705,088	5,037,115
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	15,401	17,851
Allowance for loan commitments	1,576	955	15	12
Total allowance for credit losses - loans and commitments	16,977	18,806	4,326	3,834
Collectively-evaluated for credit losses	1,721,378	1,720,961
Total loans	1,721,378	1,720,961
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	3,737	6,507
Allowance for loan commitments	272	19	41	39
Total allowance for credit losses - loans and commitments	4,009	6,526	2,992	2,836
Collectively-evaluated for credit losses	277,130	309,055
Total loans	277,130	309,055
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	724	1,487
Allowance for loan commitments	49	45	250	226
Total allowance for credit losses - loans and commitments	773	1,532	$ 4,672	$ 4,582
Collectively-evaluated for credit losses	605,682	646,387
Total loans	$ 605,682	$ 646,387

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

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