Loans and the Allowance for Credit Losses - Summary of Amortized Cost Basis Loan Balances by Year of Origination and Credit Quality Indicator (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 10,208,689	$ 9,733,478
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	17,955	14,755
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	15,181	14,005
90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	27,195	31,235
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	11,272	10,263
Amortized Cost Basis by Origination Year 2021	654	1,007
Amortized Cost Basis by Origination Year 2020	618	945
Amortized Cost Basis by Origination Year 2019	876	634
Amortized Cost Basis by Origination Year 2018	1,076	1,038
Amortized Cost Basis by Origination Year, Prior to 2018	21,277	21,509
Revolving Loans	560,524	568,725
Revolving Loans Converted to Term	1,548	1,561
Total loans	597,845	605,682
Home Equity [Member] | Current [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	11,272	10,076
Amortized Cost Basis by Origination Year 2021	654	835
Amortized Cost Basis by Origination Year 2020	579	649
Amortized Cost Basis by Origination Year 2019	734	379
Amortized Cost Basis by Origination Year 2018	720	566
Amortized Cost Basis by Origination Year, Prior to 2018	17,958	18,064
Revolving Loans	559,208	567,478
Revolving Loans Converted to Term	935	1,142
Total loans	592,060	599,189
Home Equity [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021		84
Amortized Cost Basis by Origination Year 2020		45
Amortized Cost Basis by Origination Year 2019		128
Amortized Cost Basis by Origination Year 2018	21	50
Amortized Cost Basis by Origination Year, Prior to 2018	601	628
Revolving Loans	1,316	1,247
Revolving Loans Converted to Term	151	58
Total loans	2,089	2,240
Home Equity [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2020	19	132
Amortized Cost Basis by Origination Year 2019	83	15
Amortized Cost Basis by Origination Year 2018	136	188
Amortized Cost Basis by Origination Year, Prior to 2018	237	267
Revolving Loans Converted to Term	72
Total loans	547	602
Home Equity [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022		187
Amortized Cost Basis by Origination Year 2021		88
Amortized Cost Basis by Origination Year 2020	20	119
Amortized Cost Basis by Origination Year 2019	59	112
Amortized Cost Basis by Origination Year 2018	199	234
Amortized Cost Basis by Origination Year, Prior to 2018	2,481	2,550
Revolving Loans Converted to Term	390	361
Total loans	3,149	3,651
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,852,564	5,538,968
Commercial Real Estate [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,052	6,377
Commercial Real Estate [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,084	7,728
Commercial Real Estate [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,475	10,080
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	272,007	602,867
Amortized Cost Basis by Origination Year 2021	602,878	293,417
Amortized Cost Basis by Origination Year 2020	236,407	117,042
Amortized Cost Basis by Origination Year 2019	103,492	71,681
Amortized Cost Basis by Origination Year 2018	56,380	57,827
Amortized Cost Basis by Origination Year, Prior to 2018	535,573	548,562
Revolving Loans Converted to Term	101,138	29,982
Total loans	1,907,875	1,721,378
Residential Real Estate [Member] | Current [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	272,007	599,244
Amortized Cost Basis by Origination Year 2021	602,878	292,653
Amortized Cost Basis by Origination Year 2020	236,407	116,147
Amortized Cost Basis by Origination Year 2019	103,075	71,253
Amortized Cost Basis by Origination Year 2018	56,052	56,917
Amortized Cost Basis by Origination Year, Prior to 2018	525,043	536,444
Revolving Loans Converted to Term	101,091	29,929
Total loans	1,896,553	1,702,587
Residential Real Estate [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022		1,127
Amortized Cost Basis by Origination Year 2019		69
Amortized Cost Basis by Origination Year 2018	68	105
Amortized Cost Basis by Origination Year, Prior to 2018	752	1,030
Total loans	820	2,331
Residential Real Estate [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022		563
Amortized Cost Basis by Origination Year 2021		91
Amortized Cost Basis by Origination Year 2019	282	271
Amortized Cost Basis by Origination Year 2018	102	43
Amortized Cost Basis by Origination Year, Prior to 2018	2,785	2,286
Total loans	3,169	3,254
Residential Real Estate [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022		1,933
Amortized Cost Basis by Origination Year 2021		673
Amortized Cost Basis by Origination Year 2020		895
Amortized Cost Basis by Origination Year 2019	135	88
Amortized Cost Basis by Origination Year 2018	158	762
Amortized Cost Basis by Origination Year, Prior to 2018	6,993	8,802
Revolving Loans Converted to Term	47	53
Total loans	7,333	13,206
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	51,432	61,870
Amortized Cost Basis by Origination Year 2021	47,489	44,757
Amortized Cost Basis by Origination Year 2020	33,868	50,835
Amortized Cost Basis by Origination Year 2019	36,769	19,509
Amortized Cost Basis by Origination Year 2018	13,453	11,203
Amortized Cost Basis by Origination Year, Prior to 2018	33,799	33,135
Revolving Loans	83,655	55,794
Revolving Loans Converted to Term	172	27
Total loans	300,637	277,130
Consumer [Member] | Current [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	50,807	60,907
Amortized Cost Basis by Origination Year 2021	46,478	43,871
Amortized Cost Basis by Origination Year 2020	33,249	50,317
Amortized Cost Basis by Origination Year 2019	36,428	19,289
Amortized Cost Basis by Origination Year 2018	13,303	11,084
Amortized Cost Basis by Origination Year, Prior to 2018	33,082	32,343
Revolving Loans	83,610	55,739
Revolving Loans Converted to Term	172	27
Total loans	297,129	273,577
Consumer [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	552	435
Amortized Cost Basis by Origination Year 2021	845	370
Amortized Cost Basis by Origination Year 2020	384	214
Amortized Cost Basis by Origination Year 2019	146	136
Amortized Cost Basis by Origination Year 2018	76	85
Amortized Cost Basis by Origination Year, Prior to 2018	372	241
Revolving Loans	45	51
Total loans	2,420	1,532
Consumer [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	39	413
Amortized Cost Basis by Origination Year 2021	152	375
Amortized Cost Basis by Origination Year 2020	117	82
Amortized Cost Basis by Origination Year 2019	143	19
Amortized Cost Basis by Origination Year 2018	39	33
Amortized Cost Basis by Origination Year, Prior to 2018	161	286
Total loans	651	1,208
Consumer [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	34	115
Amortized Cost Basis by Origination Year 2021	14	141
Amortized Cost Basis by Origination Year 2020	118	222
Amortized Cost Basis by Origination Year 2019	52	65
Amortized Cost Basis by Origination Year 2018	35	1
Amortized Cost Basis by Origination Year, Prior to 2018	184	265
Revolving Loans		4
Total loans	437	813
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	74,974	135,264
Amortized Cost Basis by Origination Year 2021	134,474	223,698
Amortized Cost Basis by Origination Year 2020	199,895	198,974
Amortized Cost Basis by Origination Year 2019	179,538	117,190
Amortized Cost Basis by Origination Year 2018	121,610	27,186
Amortized Cost Basis by Origination Year, Prior to 2018	56,747	31,195
Revolving Loans	77,675	35,915
Revolving Loans Converted to Term	74,503	64,458
Total loans	919,416	833,880
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	703
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		125
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	74,974	135,179
Amortized Cost Basis by Origination Year 2021	134,155	217,389
Amortized Cost Basis by Origination Year 2020	193,937	198,974
Amortized Cost Basis by Origination Year 2019	179,538	117,157
Amortized Cost Basis by Origination Year 2018	97,159	27,186
Amortized Cost Basis by Origination Year, Prior to 2018	54,683	29,696
Revolving Loans	77,675	35,059
Revolving Loans Converted to Term	74,397	62,676
Total loans	886,518	823,316
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022		85
Amortized Cost Basis by Origination Year 2021	266	6,236
Amortized Cost Basis by Origination Year 2019		33
Amortized Cost Basis by Origination Year 2018	24,451
Amortized Cost Basis by Origination Year, Prior to 2018	883	219
Revolving Loans		856
Revolving Loans Converted to Term	106	526
Total loans	25,706	7,955
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | Classified - substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021	53	73
Amortized Cost Basis by Origination Year 2020	5,958
Amortized Cost Basis by Origination Year, Prior to 2018	1,181	1,280
Revolving Loans Converted to Term		1,256
Total loans	7,192	2,609
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	634,627	730,807
Amortized Cost Basis by Origination Year 2021	667,316	678,737
Amortized Cost Basis by Origination Year 2020	647,949	647,388
Amortized Cost Basis by Origination Year 2019	576,387	427,116
Amortized Cost Basis by Origination Year 2018	394,537	429,741
Amortized Cost Basis by Origination Year, Prior to 2018	1,909,716	1,688,629
Revolving Loans	70,751	60,381
Revolving Loans Converted to Term	31,865	42,289
Total loans	4,933,148	4,705,088
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,349	6,377
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,084	7,728
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,475	9,955
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	634,489	713,697
Amortized Cost Basis by Origination Year 2021	666,798	660,856
Amortized Cost Basis by Origination Year 2020	633,834	589,674
Amortized Cost Basis by Origination Year 2019	536,681	405,689
Amortized Cost Basis by Origination Year 2018	371,491	404,241
Amortized Cost Basis by Origination Year, Prior to 2018	1,748,737	1,539,275
Revolving Loans	69,703	58,933
Revolving Loans Converted to Term	29,998	28,507
Total loans	4,691,731	4,400,872
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	138	7,755
Amortized Cost Basis by Origination Year 2021	518	15,195
Amortized Cost Basis by Origination Year 2020	14,026	52,859
Amortized Cost Basis by Origination Year 2019	13,821	17,697
Amortized Cost Basis by Origination Year 2018	12,674	14,490
Amortized Cost Basis by Origination Year, Prior to 2018	111,044	99,687
Revolving Loans	1,014	1,414
Revolving Loans Converted to Term	1,867	13,733
Total loans	155,102	222,830
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | Classified - substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022		9,355
Amortized Cost Basis by Origination Year 2021		2,686
Amortized Cost Basis by Origination Year 2020	89	4,855
Amortized Cost Basis by Origination Year 2019	25,885	3,730
Amortized Cost Basis by Origination Year 2018	10,372	11,010
Amortized Cost Basis by Origination Year, Prior to 2018	49,935	49,667
Revolving Loans	34	34
Revolving Loans Converted to Term		49
Total loans	86,315	81,386
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	150,584	407,219
Amortized Cost Basis by Origination Year 2021	231,687	160,665
Amortized Cost Basis by Origination Year 2020	136,129	118,630
Amortized Cost Basis by Origination Year 2019	98,176	139,470
Amortized Cost Basis by Origination Year 2018	125,914	92,833
Amortized Cost Basis by Origination Year, Prior to 2018	285,063	226,211
Revolving Loans	496,650	418,901
Revolving Loans Converted to Term	25,565	26,391
Total loans	1,549,768	1,590,320
Commercial and Industrial [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,574	2,275
Commercial and Industrial [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	730	1,213
Commercial and Industrial [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,801	3,485
Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	150,276	406,495
Amortized Cost Basis by Origination Year 2021	227,377	159,878
Amortized Cost Basis by Origination Year 2020	134,259	99,472
Amortized Cost Basis by Origination Year 2019	86,115	136,146
Amortized Cost Basis by Origination Year 2018	125,150	89,049
Amortized Cost Basis by Origination Year, Prior to 2018	279,330	223,514
Revolving Loans	486,532	409,789
Revolving Loans Converted to Term	14,916	16,226
Total loans	1,503,955	1,540,569
Commercial and Industrial [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	308	590
Amortized Cost Basis by Origination Year 2021	1,028	551
Amortized Cost Basis by Origination Year 2020	447	693
Amortized Cost Basis by Origination Year 2019	591	2,558
Amortized Cost Basis by Origination Year 2018	375	1,645
Amortized Cost Basis by Origination Year, Prior to 2018	2,701	1,278
Revolving Loans	5,029	5,389
Revolving Loans Converted to Term	2,584	5,029
Total loans	13,063	17,733
Commercial and Industrial [Member] | Classified - substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022		134
Amortized Cost Basis by Origination Year 2021	3,282	236
Amortized Cost Basis by Origination Year 2020	1,423	18,465
Amortized Cost Basis by Origination Year 2019	11,470	766
Amortized Cost Basis by Origination Year 2018	389	2,139
Amortized Cost Basis by Origination Year, Prior to 2018	3,032	1,419
Revolving Loans	5,089	3,723
Revolving Loans Converted to Term	8,065	5,136
Total loans	$ 32,750	$ 32,018