Loans and the Allowance for Credit Losses - Summary of Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	$ 117,790	$ 121,622	$ 185,827
Allowance for credit losses - loan commitments, beginning balance	8,368	7,775	9,514
Total beginning allowance for credit losses - loans and loan commitments	126,158	129,397	195,341
Provision for loan losses	17,527	(2,208)	(62,477)
Provision for loan commitments	236	593	(1,739)
Total provision for credit losses - loans and loan commitments	17,763	(1,615)	(64,216)
Charge-offs	(11,177)	(7,892)	(10,136)
Recoveries	6,535	6,268	8,408
Net recoveries (charge-offs)	(4,642)	(1,624)	(1,728)
Allowance for credit losses - loans, ending balance	130,675	117,790	121,622
Allowance for credit losses - loan commitments, ending balance	8,604	8,368	7,775
Total ending allowance for credit losses - loans and loan commitments	139,279	126,158	129,397
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	31,540	26,875	37,850
Allowance for credit losses - loan commitments, beginning balance	0	1,497	1,275
Total beginning allowance for credit losses - loans and loan commitments	31,540	28,372	39,125
Provision for loan losses	6,168	4,736	(10,749)
Provision for loan commitments	429	(1,497)	222
Total provision for credit losses - loans and loan commitments	6,597	3,239	(10,527)
Charge-offs	(2,283)	(1,068)	(2,521)
Recoveries	1,219	997	2,295
Net recoveries (charge-offs)	(1,064)	(71)	(226)
Allowance for credit losses - loans, ending balance	36,644	31,540	26,875
Allowance for credit losses - loan commitments, ending balance	429	0	1,497
Total ending allowance for credit losses - loans and loan commitments	37,073	31,540	28,372
Deposit Overdraft [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	1,285	2,220	639
Total beginning allowance for credit losses - loans and loan commitments	1,285	2,220	639
Provision for loan losses	1,420	333	2,694
Total provision for credit losses - loans and loan commitments	1,420	333	2,694
Charge-offs	(1,753)	(1,622)	(1,486)
Recoveries	414	354	373
Net recoveries (charge-offs)	(1,339)	(1,268)	(1,113)
Allowance for credit losses - loans, ending balance	1,366	1,285	2,220
Total ending allowance for credit losses - loans and loan commitments	1,366	1,285	2,220
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	10,841
Allowance for credit losses - loan commitments, beginning balance	6,025	4,180	6,508
Total beginning allowance for credit losses - loans and loan commitments	12,762	11,490	17,349
Provision for loan losses	321	(625)	(3,698)
Provision for loan commitments	869	1,845	(2,328)
Total provision for credit losses - loans and loan commitments	1,190	1,220	(6,026)
Charge-offs	(222)	(73)	(22)
Recoveries	287	125	189
Net recoveries (charge-offs)	65	52	167
Allowance for credit losses - loans, ending balance	7,123	6,737	7,310
Allowance for credit losses - loan commitments, ending balance	6,894	6,025	4,180
Total ending allowance for credit losses - loans and loan commitments	14,017	12,762	11,490
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	110,652
Allowance for credit losses - loan commitments, beginning balance	0	201	712
Total beginning allowance for credit losses - loans and loan commitments	52,659	65,556	111,364
Provision for loan losses	7,722	(12,939)	(44,831)
Provision for loan commitments	0	(201)	(511)
Total provision for credit losses - loans and loan commitments	7,722	(13,140)	(45,342)
Charge-offs	(1,877)	(795)	(1,825)
Recoveries	847	1,038	1,359
Net recoveries (charge-offs)	(1,030)	243	(466)
Allowance for credit losses - loans, ending balance	59,351	52,659	65,355
Allowance for credit losses - loan commitments, ending balance	0	0	201
Total ending allowance for credit losses - loans and loan commitments	59,351	52,659	65,556
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	18,208	15,401	17,851
Allowance for credit losses - loan commitments, beginning balance	2,215	1,576	955
Total beginning allowance for credit losses - loans and loan commitments	20,423	16,977	18,806
Provision for loan losses	2,290	2,717	(2,708)
Provision for loan commitments	(939)	639	621
Total provision for credit losses - loans and loan commitments	1,351	3,356	(2,087)
Charge-offs	(392)	(500)	(873)
Recoveries	1,112	590	1,131
Net recoveries (charge-offs)	720	90	258
Allowance for credit losses - loans, ending balance	21,218	18,208	15,401
Allowance for credit losses - loan commitments, ending balance	1,276	2,215	1,576
Total ending allowance for credit losses - loans and loan commitments	22,494	20,423	16,977
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	3,127	3,737	6,507
Allowance for credit losses - loan commitments, beginning balance	0	272	19
Total beginning allowance for credit losses - loans and loan commitments	3,127	4,009	6,526
Provision for loan losses	2,507	44	(2,286)
Provision for loan commitments	0	(272)	253
Total provision for credit losses - loans and loan commitments	2,507	(228)	(2,033)
Charge-offs	(3,725)	(3,476)	(2,995)
Recoveries	2,047	2,822	2,511
Net recoveries (charge-offs)	(1,678)	(654)	(484)
Allowance for credit losses - loans, ending balance	3,956	3,127	3,737
Allowance for credit losses - loan commitments, ending balance	0	0	272
Total ending allowance for credit losses - loans and loan commitments	3,956	3,127	4,009
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	4,234	724	1,487
Allowance for credit losses - loan commitments, beginning balance	128	49	45
Total beginning allowance for credit losses - loans and loan commitments	4,362	773	1,532
Provision for loan losses	(2,901)	3,526	(899)
Provision for loan commitments	(123)	79	4
Total provision for credit losses - loans and loan commitments	(3,024)	3,605	(895)
Charge-offs	(925)	(358)	(414)
Recoveries	609	342	550
Net recoveries (charge-offs)	(316)	(16)	136
Allowance for credit losses - loans, ending balance	1,017	4,234	724
Allowance for credit losses - loan commitments, ending balance	5	128	49
Total ending allowance for credit losses - loans and loan commitments	$ 1,022	$ 4,362	$ 773