Loans and the Allowance for Credit Losses - Summary of Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	$ 130,675	$ 117,790
Allowance for credit losses - loan commitments, beginning balance	8,604	8,368
Total beginning allowance for credit losses - loans and loan commitments	139,279	126,158
Provision for loan losses	13,991	4,876
Provision for loan commitments	590	1,756
Total provision for credit losses - loans and loan commitments	14,581	6,632
Charge-offs	(11,226)	(5,329)
Recoveries	3,069	2,829
Net (charge-offs) recoveries	(8,157)	(2,500)
Allowance for credit losses - loans, ending balance	136,509	120,166
Allowance for credit losses - loan commitments, ending balance	9,194	10,124
Total ending allowance for credit losses - loans and loan commitments	145,703	130,290
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	36,644	31,540
Allowance for credit losses - loan commitments, beginning balance	429
Total beginning allowance for credit losses - loans and loan commitments	37,073	31,540
Provision for loan losses	9,726	1,337
Provision for loan commitments	(429)	527
Total provision for credit losses - loans and loan commitments	9,297	1,864
Charge-offs	(6,072)	(999)
Recoveries	1,107	259
Net (charge-offs) recoveries	(4,965)	(740)
Allowance for credit losses - loans, ending balance	41,405	32,137
Allowance for credit losses - loan commitments, ending balance	0	527
Total ending allowance for credit losses - loans and loan commitments	41,405	32,664
Deposit Overdraft [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	1,366	1,285
Total beginning allowance for credit losses - loans and loan commitments	1,366	1,285
Provision for loan losses	833	407
Total provision for credit losses - loans and loan commitments	833	407
Charge-offs	(861)	(818)
Recoveries	213	221
Net (charge-offs) recoveries	(648)	(597)
Allowance for credit losses - loans, ending balance	1,551	1,095
Total ending allowance for credit losses - loans and loan commitments	1,551	1,095
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	7,123	6,737
Allowance for credit losses - loan commitments, beginning balance	6,894	6,025
Total beginning allowance for credit losses - loans and loan commitments	14,017	12,762
Provision for loan losses	1,516	(845)
Provision for loan commitments	1,046	1,168
Total provision for credit losses - loans and loan commitments	2,562	323
Charge-offs	(813)	(222)
Recoveries		128
Net (charge-offs) recoveries	(813)	(94)
Allowance for credit losses - loans, ending balance	7,826	5,798
Allowance for credit losses - loan commitments, ending balance	7,940	7,193
Total ending allowance for credit losses - loans and loan commitments	15,766	12,991
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	59,351	52,659
Total beginning allowance for credit losses - loans and loan commitments	59,351	52,659
Provision for loan losses	(402)	1,246
Provision for loan commitments		182
Total provision for credit losses - loans and loan commitments	(402)	1,428
Charge-offs	(815)	(1,381)
Recoveries	443	427
Net (charge-offs) recoveries	(372)	(954)
Allowance for credit losses - loans, ending balance	58,577	52,951
Allowance for credit losses - loan commitments, ending balance		182
Total ending allowance for credit losses - loans and loan commitments	58,577	53,133
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	21,218	18,208
Allowance for credit losses - loan commitments, beginning balance	1,276	2,215
Total beginning allowance for credit losses - loans and loan commitments	22,494	20,423
Provision for loan losses	1,342	1,787
Provision for loan commitments	(22)	(621)
Total provision for credit losses - loans and loan commitments	1,320	1,166
Charge-offs	(272)	7
Recoveries	115	313
Net (charge-offs) recoveries	(157)	320
Allowance for credit losses - loans, ending balance	22,403	20,315
Allowance for credit losses - loan commitments, ending balance	1,254	1,594
Total ending allowance for credit losses - loans and loan commitments	23,657	21,909
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	3,956	3,127
Total beginning allowance for credit losses - loans and loan commitments	3,956	3,127
Provision for loan losses	773	693
Total provision for credit losses - loans and loan commitments	773	693
Charge-offs	(1,980)	(1,601)
Recoveries	894	1,231
Net (charge-offs) recoveries	(1,086)	(370)
Allowance for credit losses - loans, ending balance	3,643	3,450
Total ending allowance for credit losses - loans and loan commitments	3,643	3,450
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	1,017	4,234
Allowance for credit losses - loan commitments, beginning balance	5	128
Total beginning allowance for credit losses - loans and loan commitments	1,022	4,362
Provision for loan losses	203	251
Provision for loan commitments	(5)	500
Total provision for credit losses - loans and loan commitments	198	751
Charge-offs	(413)	(315)
Recoveries	297	250
Net (charge-offs) recoveries	(116)	(65)
Allowance for credit losses - loans, ending balance	1,104	4,420
Allowance for credit losses - loan commitments, ending balance	0	628
Total ending allowance for credit losses - loans and loan commitments	$ 1,104	$ 5,048