Loans and the Allowance for Credit Losses - Summary of Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	$ 117,790	$ 121,622
Allowance for credit losses - loan commitments, beginning balance	8,368	7,775
Total beginning allowance for credit losses - loans and loan commitments	126,158	129,397
Provision for loan losses	11,612	(5,907)
Provision for loan commitments	1,361	1,163
Total provision for credit losses - loans and loan commitments	12,973	(4,744)
Charge-offs	(7,984)	(5,972)
Recoveries	5,197	4,841
Net (charge-offs) recoveries	(2,787)	(1,131)
Allowance for credit losses - loans, ending balance	126,615	114,584
Allowance for credit losses - loan commitments, ending balance	9,729	8,938
Total ending allowance for credit losses - loans and loan commitments	136,344	123,522
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	31,540	26,875
Allowance for credit losses - loan commitments, beginning balance		1,497
Total beginning allowance for credit losses - loans and loan commitments	31,540	28,372
Provision for loan losses	3,678	2,160
Provision for loan commitments	1,087	(1,214)
Total provision for credit losses - loans and loan commitments	4,765	946
Charge-offs	(1,498)	(983)
Recoveries	996	871
Net (charge-offs) recoveries	(502)	(112)
Allowance for credit losses - loans, ending balance	34,716	28,923
Allowance for credit losses - loan commitments, ending balance	1,087	283
Total ending allowance for credit losses - loans and loan commitments	35,803	29,206
Deposit Overdrafts [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	1,285	2,220
Total beginning allowance for credit losses - loans and loan commitments	1,285	2,220
Provision for loan losses	957	260
Total provision for credit losses - loans and loan commitments	957	260
Charge-offs	(1,262)	(1,215)
Recoveries	309	278
Net (charge-offs) recoveries	(953)	(937)
Allowance for credit losses - loans, ending balance	1,289	1,543
Total ending allowance for credit losses - loans and loan commitments	1,289	1,543
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	6,737	7,310
Allowance for credit losses - loan commitments, beginning balance	6,025	4,180
Total beginning allowance for credit losses - loans and loan commitments	12,762	11,490
Provision for loan losses	(614)	1,369
Provision for loan commitments	1,247	1,618
Total provision for credit losses - loans and loan commitments	633	2,987
Charge-offs	(222)	(73)
Recoveries	207	25
Net (charge-offs) recoveries	(15)	(48)
Allowance for credit losses - loans, ending balance	6,108	8,631
Allowance for credit losses - loan commitments, ending balance	7,272	5,798
Total ending allowance for credit losses - loans and loan commitments	13,380	14,429
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	52,659	65,355
Allowance for credit losses - loan commitments, beginning balance		201
Total beginning allowance for credit losses - loans and loan commitments	52,659	65,556
Provision for loan losses	7,595	(12,082)
Provision for loan commitments		(201)
Total provision for credit losses - loans and loan commitments	7,595	(12,283)
Charge-offs	(1,450)	(642)
Recoveries	821	899
Net (charge-offs) recoveries	(629)	257
Allowance for credit losses - loans, ending balance	59,625	53,530
Total ending allowance for credit losses - loans and loan commitments	59,625	53,530
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	18,208	15,401
Allowance for credit losses - loan commitments, beginning balance	2,215	1,576
Total beginning allowance for credit losses - loans and loan commitments	20,423	16,977
Provision for loan losses	1,582	1,133
Provision for loan commitments	(863)	788
Total provision for credit losses - loans and loan commitments	719	1,921
Charge-offs	(278)	(282)
Recoveries	929	483
Net (charge-offs) recoveries	651	201
Allowance for credit losses - loans, ending balance	20,441	16,735
Allowance for credit losses - loan commitments, ending balance	1,352	2,364
Total ending allowance for credit losses - loans and loan commitments	21,793	19,099
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	3,127	3,737
Allowance for credit losses - loan commitments, beginning balance		272
Total beginning allowance for credit losses - loans and loan commitments	3,127	4,009
Provision for loan losses	1,315	1,216
Provision for loan commitments		165
Total provision for credit losses - loans and loan commitments	1,315	1,381
Charge-offs	(2,604)	(2,511)
Recoveries	1,604	1,992
Net (charge-offs) recoveries	(1,000)	(519)
Allowance for credit losses - loans, ending balance	3,442	4,434
Allowance for credit losses - loan commitments, ending balance		437
Total ending allowance for credit losses - loans and loan commitments	3,442	4,871
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	4,234	724
Allowance for credit losses - loan commitments, beginning balance	128	49
Total beginning allowance for credit losses - loans and loan commitments	4,362	773
Provision for loan losses	(2,901)	37
Provision for loan commitments	(110)	7
Total provision for credit losses - loans and loan commitments	(3,011)	44
Charge-offs	(670)	(266)
Recoveries	331	293
Net (charge-offs) recoveries	(339)	27
Allowance for credit losses - loans, ending balance	994	788
Allowance for credit losses - loan commitments, ending balance	18	56
Total ending allowance for credit losses - loans and loan commitments	$ 1,012	$ 844