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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	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 10,702,728	$ 9,733,478
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	11,222	14,755
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,621	14,005
90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	30,986	31,235
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	10,798	10,263
Amortized Cost Basis by Origination Year 2021	1,535	1,007
Amortized Cost Basis by Origination Year 2020	1,885	945
Amortized Cost Basis by Origination Year 2019	1,984	634
Amortized Cost Basis by Origination Year 2018	1,467	1,038
Amortized Cost Basis by Origination Year, Prior to 2017	29,251	21,509
Revolving Loans	646,706	568,725
Revolving Loans Converted to Term	1,439	1,561
Total loans	695,065	605,682
Home Equity [Member] | Current [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	10,718	10,076
Amortized Cost Basis by Origination Year 2021	1,459	835
Amortized Cost Basis by Origination Year 2020	1,133	649
Amortized Cost Basis by Origination Year 2019	1,774	379
Amortized Cost Basis by Origination Year 2018	1,088	566
Amortized Cost Basis by Origination Year, Prior to 2017	25,203	18,064
Revolving Loans	644,430	567,478
Revolving Loans Converted to Term	957	1,142
Total loans	686,762	599,189
Home Equity [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	80
Amortized Cost Basis by Origination Year 2021	61	84
Amortized Cost Basis by Origination Year 2020	180	45
Amortized Cost Basis by Origination Year 2019	67	128
Amortized Cost Basis by Origination Year 2018	34	50
Amortized Cost Basis by Origination Year, Prior to 2017	1,165	628
Revolving Loans	2,260	1,247
Revolving Loans Converted to Term	38	58
Total loans	3,885	2,240
Home Equity [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021	15
Amortized Cost Basis by Origination Year 2020		132
Amortized Cost Basis by Origination Year 2019	50	15
Amortized Cost Basis by Origination Year 2018	88	188
Amortized Cost Basis by Origination Year, Prior to 2017	458	267
Revolving Loans Converted to Term	10
Total loans	621	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	572	119
Amortized Cost Basis by Origination Year 2019	93	112
Amortized Cost Basis by Origination Year 2018	257	234
Amortized Cost Basis by Origination Year, Prior to 2017	2,425	2,550
Revolving Loans	16
Revolving Loans Converted to Term	434	361
Total loans	3,797	3,651
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,061,344	5,538,968
Commercial Real Estate [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,147	6,377
Commercial Real Estate [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,241	7,728
Commercial Real Estate [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	16,378	10,080
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	541,659	602,867
Amortized Cost Basis by Origination Year 2021	557,370	293,417
Amortized Cost Basis by Origination Year 2020	211,845	117,042
Amortized Cost Basis by Origination Year 2019	97,510	71,681
Amortized Cost Basis by Origination Year 2018	52,254	57,827
Amortized Cost Basis by Origination Year, Prior to 2017	489,164	548,562
Revolving Loans Converted to Term	190,782	29,982
Total loans	2,140,584	1,721,378
Residential Real Estate [Member] | Current [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	541,659	599,244
Amortized Cost Basis by Origination Year 2021	556,928	292,653
Amortized Cost Basis by Origination Year 2020	211,496	116,147
Amortized Cost Basis by Origination Year 2019	97,160	71,253
Amortized Cost Basis by Origination Year 2018	52,135	56,917
Amortized Cost Basis by Origination Year, Prior to 2017	478,977	536,444
Revolving Loans Converted to Term	190,740	29,929
Total loans	2,129,095	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		105
Amortized Cost Basis by Origination Year, Prior to 2017	853	1,030
Total loans	853	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	442	91
Amortized Cost Basis by Origination Year 2020	349
Amortized Cost Basis by Origination Year 2019	65	271
Amortized Cost Basis by Origination Year 2018		43
Amortized Cost Basis by Origination Year, Prior to 2017	2,680	2,286
Total loans	3,536	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	285	88
Amortized Cost Basis by Origination Year 2018	119	762
Amortized Cost Basis by Origination Year, Prior to 2017	6,654	8,802
Revolving Loans Converted to Term	42	53
Total loans	7,100	13,206
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	86,164	61,870
Amortized Cost Basis by Origination Year 2021	37,561	44,757
Amortized Cost Basis by Origination Year 2020	25,722	50,835
Amortized Cost Basis by Origination Year 2019	25,773	19,509
Amortized Cost Basis by Origination Year 2018	8,617	11,203
Amortized Cost Basis by Origination Year, Prior to 2017	16,690	33,135
Revolving Loans	25,786	55,794
Revolving Loans Converted to Term	27	27
Total loans	226,340	277,130
Consumer [Member] | Current [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	84,817	60,907
Amortized Cost Basis by Origination Year 2021	36,123	43,871
Amortized Cost Basis by Origination Year 2020	25,071	50,317
Amortized Cost Basis by Origination Year 2019	25,535	19,289
Amortized Cost Basis by Origination Year 2018	8,488	11,084
Amortized Cost Basis by Origination Year, Prior to 2017	16,337	32,343
Revolving Loans	25,755	55,739
Revolving Loans Converted to Term	27	27
Total loans	222,153	273,577
Consumer [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	980	435
Amortized Cost Basis by Origination Year 2021	937	370
Amortized Cost Basis by Origination Year 2020	488	214
Amortized Cost Basis by Origination Year 2019	159	136
Amortized Cost Basis by Origination Year 2018	98	85
Amortized Cost Basis by Origination Year, Prior to 2017	217	241
Revolving Loans		51
Total loans	2,910	1,532
Consumer [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	184	413
Amortized Cost Basis by Origination Year 2021	293	375
Amortized Cost Basis by Origination Year 2020	94	82
Amortized Cost Basis by Origination Year 2019	47	19
Amortized Cost Basis by Origination Year 2018	29	33
Amortized Cost Basis by Origination Year, Prior to 2017	57	286
Total loans	704	1,208
Consumer [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	183	115
Amortized Cost Basis by Origination Year 2021	208	141
Amortized Cost Basis by Origination Year 2020	69	222
Amortized Cost Basis by Origination Year 2019	32	65
Amortized Cost Basis by Origination Year 2018	2	1
Amortized Cost Basis by Origination Year, Prior to 2017	79	265
Revolving Loans		4
Total loans	573	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	160,328	135,264
Amortized Cost Basis by Origination Year 2021	136,396	223,698
Amortized Cost Basis by Origination Year 2020	144,172	198,974
Amortized Cost Basis by Origination Year 2019	155,141	117,190
Amortized Cost Basis by Origination Year 2018	61,847	27,186
Amortized Cost Basis by Origination Year, Prior to 2017	51,536	31,195
Revolving Loans	117,237	35,915
Revolving Loans Converted to Term	117,230	64,458
Total loans	943,887	833,880
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	910
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	741	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	159,769	135,179
Amortized Cost Basis by Origination Year 2021	136,131	217,389
Amortized Cost Basis by Origination Year 2020	138,171	198,974
Amortized Cost Basis by Origination Year 2019	155,141	117,157
Amortized Cost Basis by Origination Year 2018	61,823	27,186
Amortized Cost Basis by Origination Year, Prior to 2017	51,381	29,696
Revolving Loans	117,237	35,059
Revolving Loans Converted to Term	92,151	62,676
Total loans	911,804	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	559	85
Amortized Cost Basis by Origination Year 2021	265	6,236
Amortized Cost Basis by Origination Year 2020
Amortized Cost Basis by Origination Year 2019		33
Amortized Cost Basis by Origination Year 2018	24
Amortized Cost Basis by Origination Year, Prior to 2017	31	219
Revolving Loans		856
Revolving Loans Converted to Term	450	526
Total loans	1,329	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		73
Amortized Cost Basis by Origination Year 2020	6,001
Amortized Cost Basis by Origination Year 2018
Amortized Cost Basis by Origination Year, Prior to 2017	124	1,280
Revolving Loans Converted to Term	24,629	1,256
Total loans	30,754	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	1,093,538	730,807
Amortized Cost Basis by Origination Year 2021	621,217	678,737
Amortized Cost Basis by Origination Year 2020	616,815	647,388
Amortized Cost Basis by Origination Year 2019	551,152	427,116
Amortized Cost Basis by Origination Year 2018	395,192	429,741
Amortized Cost Basis by Origination Year, Prior to 2017	1,666,522	1,688,629
Revolving Loans	73,427	60,381
Revolving Loans Converted to Term	99,594	42,289
Total loans	5,117,457	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	2,147	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	331	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	15,637	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	1,082,984	713,697
Amortized Cost Basis by Origination Year 2021	620,205	660,856
Amortized Cost Basis by Origination Year 2020	613,663	589,674
Amortized Cost Basis by Origination Year 2019	528,004	405,689
Amortized Cost Basis by Origination Year 2018	371,880	404,241
Amortized Cost Basis by Origination Year, Prior to 2017	1,551,478	1,539,275
Revolving Loans	72,327	58,933
Revolving Loans Converted to Term	99,594	28,507
Total loans	4,940,135	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	10,554	7,755
Amortized Cost Basis by Origination Year 2021	354	15,195
Amortized Cost Basis by Origination Year 2020	2,877	52,859
Amortized Cost Basis by Origination Year 2019	7,659	17,697
Amortized Cost Basis by Origination Year 2018	13,551	14,490
Amortized Cost Basis by Origination Year, Prior to 2017	85,332	99,687
Revolving Loans	1,066	1,414
Revolving Loans Converted to Term		13,733
Total loans	121,393	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	658	2,686
Amortized Cost Basis by Origination Year 2020	275	4,855
Amortized Cost Basis by Origination Year 2019	15,489	3,730
Amortized Cost Basis by Origination Year 2018	9,761	11,010
Amortized Cost Basis by Origination Year, Prior to 2017	29,712	49,667
Revolving Loans	34	34
Revolving Loans Converted to Term		49
Total loans	55,929	81,386
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	281,520	407,219
Amortized Cost Basis by Origination Year 2021	189,206	160,665
Amortized Cost Basis by Origination Year 2020	118,136	118,630
Amortized Cost Basis by Origination Year 2019	82,577	139,470
Amortized Cost Basis by Origination Year 2018	104,021	92,833
Amortized Cost Basis by Origination Year, Prior to 2017	237,440	226,211
Revolving Loans	534,745	418,901
Revolving Loans Converted to Term	31,750	26,391
Total loans	1,579,395	1,590,320
Commercial and Industrial [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,427	2,275
Commercial and Industrial [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	519	1,213
Commercial and Industrial [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,138	3,485
Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	280,510	406,495
Amortized Cost Basis by Origination Year 2021	184,805	159,878
Amortized Cost Basis by Origination Year 2020	116,890	99,472
Amortized Cost Basis by Origination Year 2019	72,142	136,146
Amortized Cost Basis by Origination Year 2018	103,660	89,049
Amortized Cost Basis by Origination Year, Prior to 2017	232,062	223,514
Revolving Loans	526,025	409,789
Revolving Loans Converted to Term	22,206	16,226
Total loans	1,538,300	1,540,569
Commercial and Industrial [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	917	590
Amortized Cost Basis by Origination Year 2021	1,192	551
Amortized Cost Basis by Origination Year 2020	270	693
Amortized Cost Basis by Origination Year 2019	8,278	2,558
Amortized Cost Basis by Origination Year 2018	264	1,645
Amortized Cost Basis by Origination Year, Prior to 2017	2,524	1,278
Revolving Loans	7,654	5,389
Revolving Loans Converted to Term	4,124	5,029
Total loans	25,223	17,733
Commercial and Industrial [Member] | Classified - substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2022	93	134
Amortized Cost Basis by Origination Year 2021	3,209	236
Amortized Cost Basis by Origination Year 2020	976	18,465
Amortized Cost Basis by Origination Year 2019	2,157	766
Amortized Cost Basis by Origination Year 2018	97	2,139
Amortized Cost Basis by Origination Year, Prior to 2017	2,854	1,419
Revolving Loans	1,066	3,723
Revolving Loans Converted to Term	5,420	5,136
Total loans	$ 15,872	$ 32,018

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