CREDIT QUALITY ASSESSMENT - Information about Credit Quality Indicator by Year of Origination (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	$ 3,120,897	$ 3,023,908
Year one	2,647,414	1,626,031
Year two	1,339,364	1,316,007
Year three	1,039,363	826,781
Year four	649,024	702,719
Prior	1,559,209	1,376,294
Revolving Loans	1,041,435	1,095,351
Total loans	11,396,706	9,967,091
Current period gross charge-offs, total	1,105	12,313	$ 1,819
Commercial investor real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,543,664	1,394,986
Year one	1,216,546	749,082
Year two	695,224	625,715
Year three	567,341	366,804
Year four	343,815	340,595
Prior	748,262	644,925
Revolving Loans	15,242	19,239
Total loans	5,130,094	4,141,346
Current period gross charge-offs, current year	0	0
Current period gross charge-offs, year one	0	0
Current period gross charge-offs, year two	0	0
Current period gross charge-offs, year three	0	903
Current period gross charge-offs, year four	0	3,975
Current period gross charge-offs, prior	0	924
Current period gross charge-offs, revolving loans	0	0
Current period gross charge-offs, total	0	5,802
Commercial investor real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,510,446	1,391,969
Year one	1,197,504	748,236
Year two	694,756	616,761
Year three	567,247	357,640
Year four	335,103	328,327
Prior	742,405	633,913
Revolving Loans	15,242	19,239
Total loans	5,062,703	4,096,085
Commercial investor real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	32,661	2,210
Year one	17,146	510
Year two	468	4,646
Year three	94	596
Year four	473	2,204
Prior	4,814	10,438
Revolving Loans	0	0
Total loans	55,656	20,604
Commercial investor real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	557	807
Year one	1,896	336
Year two	0	4,308
Year three	0	8,568
Year four	8,239	10,064
Prior	1,043	574
Revolving Loans	0	0
Total loans	11,735	24,657
Commercial investor real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Prior	0	0
Revolving Loans	0	0
Total loans	0	0
Commercial owner-occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	399,126	362,293
Year one	328,817	257,626
Year two	242,172	327,764
Year three	267,964	189,716
Year four	144,917	177,164
Prior	390,874	375,169
Revolving Loans	1,167	1,149
Total loans	1,775,037	1,690,881
Current period gross charge-offs, current year	0	0
Current period gross charge-offs, year one	0	0
Current period gross charge-offs, year two	0	0
Current period gross charge-offs, year three	0	136
Current period gross charge-offs, year four	0	0
Current period gross charge-offs, prior	0	0
Current period gross charge-offs, revolving loans	0	0
Current period gross charge-offs, total	0	136
Commercial owner-occupied real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	391,340	360,169
Year one	328,657	254,350
Year two	240,738	319,348
Year three	260,114	178,416
Year four	140,841	172,354
Prior	381,386	363,685
Revolving Loans	1,167	1,149
Total loans	1,744,243	1,649,471
Commercial owner-occupied real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	4,567	156
Year one	0	1,476
Year two	1,301	4,388
Year three	1,740	9,035
Year four	2,066	4,456
Prior	7,323	9,106
Revolving Loans	0	0
Total loans	16,997	28,617
Commercial owner-occupied real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	3,219	1,968
Year one	160	1,800
Year two	133	4,028
Year three	6,110	2,265
Year four	2,010	354
Prior	2,165	2,378
Revolving Loans	0	0
Total loans	13,797	12,793
Commercial owner-occupied real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Prior	0	0
Revolving Loans	0	0
Total loans	0	0
Commercial AD&C
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	367,169	457,444
Year one	439,468	226,332
Year two	113,713	148,561
Year three	34,340	87,934
Year four	14,816	13,938
Prior	0	0
Revolving Loans	120,522	153,885
Total loans	1,090,028	1,088,094
Current period gross charge-offs, current year	0	0
Current period gross charge-offs, year one	0	0
Current period gross charge-offs, year two	0	0
Current period gross charge-offs, year three	0	0
Current period gross charge-offs, year four	0	2,007
Current period gross charge-offs, prior	0	0
Current period gross charge-offs, revolving loans	0	0
Current period gross charge-offs, total	0	2,007
Commercial AD&C | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	366,096	454,207
Year one	439,468	226,332
Year two	113,713	148,260
Year three	34,340	87,934
Year four	14,816	13,938
Prior	0	0
Revolving Loans	119,727	152,896
Total loans	1,088,160	1,083,567
Commercial AD&C | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,073	2,888
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Prior	0	0
Revolving Loans	795	989
Total loans	1,868	3,877
Commercial AD&C | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	349
Year one	0	0
Year two	0	301
Year three	0	0
Year four	0	0
Prior	0	0
Revolving Loans	0	0
Total loans	0	650
Commercial AD&C | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Prior	0	0
Revolving Loans	0	0
Total loans	0	0
Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	336,909	259,638
Year one	357,307	175,065
Year two	176,834	54,245
Year three	50,886	76,471
Year four	61,970	110,951
Prior	304,027	261,200
Revolving Loans	0	0
Total loans	1,287,933	937,570
Current period gross charge-offs, current year	0	0
Current period gross charge-offs, year one	0	0
Current period gross charge-offs, year two	0	0
Current period gross charge-offs, year three	0	0
Current period gross charge-offs, year four	24	0
Current period gross charge-offs, prior	131	0
Current period gross charge-offs, revolving loans	0	0
Current period gross charge-offs, total	155	0
Residential mortgage | 660-850
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	330,109	246,612
Year one	344,062	165,623
Year two	171,330	46,925
Year three	41,883	65,865
Year four	51,651	102,628
Prior	262,570	223,420
Revolving Loans	0	0
Total loans	1,201,605	851,073
Residential mortgage | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	4,571	11,102
Year one	6,196	3,285
Year two	1,173	3,583
Year three	3,925	4,255
Year four	6,041	4,645
Prior	24,006	20,052
Revolving Loans	0	0
Total loans	45,912	46,922
Residential mortgage | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	369	1,472
Year one	4,013	1,864
Year two	1,439	2,162
Year three	1,256	4,522
Year four	1,931	1,599
Prior	6,945	8,201
Revolving Loans	0	0
Total loans	15,953	19,820
Residential mortgage | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,860	452
Year one	3,036	4,293
Year two	2,892	1,575
Year three	3,822	1,829
Year four	2,347	2,079
Prior	10,506	9,527
Revolving Loans	0	0
Total loans	24,463	19,755
Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	132,776	138,002
Year one	77,036	45,890
Year two	12,133	8,713
Year three	150	2,078
Year four	1,432	1,347
Prior	1,245	1,622
Revolving Loans	0	0
Total loans	224,772	197,652
Current period gross charge-offs, current year	0	0
Current period gross charge-offs, year one	0	0
Current period gross charge-offs, year two	0	0
Current period gross charge-offs, year three	0	0
Current period gross charge-offs, year four	0	0
Current period gross charge-offs, prior	0	0
Current period gross charge-offs, revolving loans	0	0
Current period gross charge-offs, total	0	0
Residential construction | 660-850
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	131,259	134,335
Year one	75,844	45,890
Year two	12,133	8,063
Year three	150	2,078
Year four	1,432	1,347
Prior	1,245	1,160
Revolving Loans	0	0
Total loans	222,063	192,873
Residential construction | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	908	1,922
Year one	373	0
Year two	0	650
Year three	0	0
Year four	0	0
Prior	0	0
Revolving Loans	0	0
Total loans	1,281	2,572
Residential construction | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	609	0
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Prior	0	462
Revolving Loans	0	0
Total loans	609	462
Residential construction | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	1,745
Year one	819	0
Year two	0	0
Year three	0	0
Year four	0	0
Prior	0	0
Revolving Loans	0	0
Total loans	819	1,745
Commercial Business
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,451,044	8,402,155
Commercial Business | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	333,627	407,868
Year one	225,314	170,454
Year two	97,988	146,708
Year three	115,739	99,298
Year four	78,838	56,459
Prior	80,452	56,406
Revolving Loans	523,927	544,641
Total loans	1,455,885	1,481,834
Current period gross charge-offs, current year	174	0
Current period gross charge-offs, year one	0	0
Current period gross charge-offs, year two	0	88
Current period gross charge-offs, year three	0	1,674
Current period gross charge-offs, year four	138	46
Current period gross charge-offs, prior	404	2,236
Current period gross charge-offs, revolving loans	0	25
Current period gross charge-offs, total	716	4,069
Commercial Business | Commercial business | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	330,598	403,871
Year one	223,245	165,194
Year two	95,787	137,069
Year three	105,922	96,800
Year four	77,891	55,100
Prior	78,009	53,764
Revolving Loans	508,839	533,893
Total loans	1,420,291	1,445,691
Commercial Business | Commercial business | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	127	220
Year one	458	1,998
Year two	1,107	7,030
Year three	7,787	1,701
Year four	498	548
Prior	322	577
Revolving Loans	13,225	9,212
Total loans	23,524	21,286
Commercial Business | Commercial business | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,902	3,777
Year one	1,611	3,262
Year two	1,094	2,609
Year three	2,030	797
Year four	449	811
Prior	2,121	2,065
Revolving Loans	1,863	1,536
Total loans	12,070	14,857
Commercial Business | Commercial business | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Prior	0	0
Revolving Loans	0	0
Total loans	0	0
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	7,626	3,677
Year one	2,926	1,582
Year two	1,300	4,301
Year three	2,943	4,480
Year four	3,236	2,265
Prior	34,349	36,972
Revolving Loans	380,577	376,437
Total loans	432,957	429,714
Current period gross charge-offs, current year	0	0
Current period gross charge-offs, year one	5	0
Current period gross charge-offs, year two	15	7
Current period gross charge-offs, year three	0	2
Current period gross charge-offs, year four	13	0
Current period gross charge-offs, prior	20	106
Current period gross charge-offs, revolving loans	181	184
Current period gross charge-offs, total	234	299
Consumer | 660-850
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	6,689	3,179
Year one	2,346	1,393
Year two	1,201	3,130
Year three	2,147	3,060
Year four	2,047	1,648
Prior	23,170	26,156
Revolving Loans	359,468	350,466
Total loans	397,068	389,032
Consumer | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	658	352
Year one	467	123
Year two	59	324
Year three	198	716
Year four	664	430
Prior	5,459	4,906
Revolving Loans	11,269	14,119
Total loans	18,774	20,970
Consumer | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	123	58
Year one	56	8
Year two	0	311
Year three	465	160
Year four	316	89
Prior	2,802	2,809
Revolving Loans	3,824	4,926
Total loans	7,586	8,361
Consumer | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	156	88
Year one	57	58
Year two	40	536
Year three	133	544
Year four	209	98
Prior	2,918	3,101
Revolving Loans	6,016	6,926
Total loans	$ 9,529	$ 11,351