CREDIT QUALITY ASSESSMENT - Information about Credit Quality Indicator by Year of Origination (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	$ 1,245,085	$ 3,120,897
Year one	2,958,596	2,647,414
Year two	2,375,873	1,339,364
Year three	1,175,656	1,039,363
Year four	870,390	649,024
Prior	1,776,440	1,559,209
Revolving Loans	964,949	1,041,435
Total loans	11,366,989	11,396,706
Current period gross charge-offs, total	2,614	1,105	$ 12,313
Commercial Investor R/E
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	445,782	1,543,664
Year one	1,396,438	1,216,546
Year two	1,226,951	695,224
Year three	634,361	567,341
Year four	511,146	343,815
Prior	865,346	748,262
Revolving Loans	24,401	15,242
Total loans	5,104,425	5,130,094
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	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
Commercial Investor R/E | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	405,740	1,510,446
Year one	1,395,973	1,197,504
Year two	1,195,708	694,756
Year three	634,361	567,247
Year four	511,146	335,103
Prior	848,958	742,405
Revolving Loans	23,653	15,242
Total loans	5,015,539	5,062,703
Commercial Investor R/E | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	9,250	32,661
Year one	0	17,146
Year two	316	468
Year three	0	94
Year four	0	473
Prior	1,978	4,814
Revolving Loans	0	0
Total loans	11,544	55,656
Commercial Investor R/E | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	30,792	557
Year one	465	1,896
Year two	30,927	0
Year three	0	0
Year four	0	8,239
Prior	14,410	1,043
Revolving Loans	748	0
Total loans	77,342	11,735
Commercial Investor R/E | 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 R/E
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	139,040	399,126
Year one	364,951	328,817
Year two	321,310	242,172
Year three	239,979	267,964
Year four	243,278	144,917
Prior	441,056	390,874
Revolving Loans	5,621	1,167
Total loans	1,755,235	1,775,037
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
Commercial Owner- Occupied R/E | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	136,072	391,340
Year one	361,247	328,657
Year two	318,269	240,738
Year three	238,761	260,114
Year four	235,145	140,841
Prior	428,846	381,386
Revolving Loans	5,621	1,167
Total loans	1,723,961	1,744,243
Commercial Owner- Occupied R/E | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	406	4,567
Year one	70	0
Year two	2,240	1,301
Year three	875	1,740
Year four	2,267	2,066
Prior	8,616	7,323
Revolving Loans	0	0
Total loans	14,474	16,997
Commercial Owner- Occupied R/E | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,562	3,219
Year one	3,634	160
Year two	801	133
Year three	343	6,110
Year four	5,866	2,010
Prior	3,594	2,165
Revolving Loans	0	0
Total loans	16,800	13,797
Commercial Owner- Occupied R/E | 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	335,934	367,169
Year one	289,301	439,468
Year two	178,889	113,713
Year three	28,954	34,340
Year four	0	14,816
Prior	0	0
Revolving Loans	155,889	120,522
Total loans	988,967	1,090,028
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
Commercial AD&C | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	334,918	366,096
Year one	288,732	439,468
Year two	178,889	113,713
Year three	28,954	34,340
Year four	0	14,816
Prior	0	0
Revolving Loans	155,889	119,727
Total loans	987,382	1,088,160
Commercial AD&C | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	1,073
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Prior	0	0
Revolving Loans	0	795
Total loans	0	1,868
Commercial AD&C | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,016	0
Year one	569	0
Year two	0	0
Year three	0	0
Year four	0	0
Prior	0	0
Revolving Loans	0	0
Total loans	1,585	0
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	32,863	336,909
Year one	487,240	357,307
Year two	418,747	176,834
Year three	173,191	50,886
Year four	47,779	61,970
Prior	314,701	304,027
Revolving Loans	0	0
Total loans	1,474,521	1,287,933
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	43	0
Current period gross charge-offs, year three	0	0
Current period gross charge-offs, year four	10	24
Current period gross charge-offs, prior	107	131
Current period gross charge-offs, revolving loans	0	0
Current period gross charge-offs, total	160	155
Residential Mortgage | 660-850
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	31,853	330,109
Year one	476,631	344,062
Year two	394,414	171,330
Year three	166,387	41,883
Year four	41,473	51,651
Prior	266,927	262,570
Revolving Loans	0	0
Total loans	1,377,685	1,201,605
Residential Mortgage | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	781	4,571
Year one	7,022	6,196
Year two	18,284	1,173
Year three	2,009	3,925
Year four	1,882	6,041
Prior	24,040	24,006
Revolving Loans	0	0
Total loans	54,018	45,912
Residential Mortgage | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	369
Year one	1,545	4,013
Year two	2,698	1,439
Year three	2,371	1,256
Year four	1,891	1,931
Prior	9,377	6,945
Revolving Loans	0	0
Total loans	17,882	15,953
Residential Mortgage | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	229	1,860
Year one	2,042	3,036
Year two	3,351	2,892
Year three	2,424	3,822
Year four	2,533	2,347
Prior	14,357	10,506
Revolving Loans	0	0
Total loans	24,936	24,463
Residential Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	24,059	132,776
Year one	68,773	77,036
Year two	23,216	12,133
Year three	3,978	150
Year four	150	1,432
Prior	1,243	1,245
Revolving Loans	0	0
Total loans	121,419	224,772
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	21,975	131,259
Year one	68,273	75,844
Year two	21,897	12,133
Year three	2,478	150
Year four	150	1,432
Prior	0	1,245
Revolving Loans	0	0
Total loans	114,773	222,063
Residential Construction | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,641	908
Year one	500	373
Year two	1,319	0
Year three	1,500	0
Year four	0	0
Prior	1,243	0
Revolving Loans	0	0
Total loans	6,203	1,281
Residential Construction | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	443	609
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	443	609
Residential Construction | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Year one	0	819
Year two	0	0
Year three	0	0
Year four	0	0
Prior	0	0
Revolving Loans	0	0
Total loans	0	819
Commercial Business
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,353,507	9,451,044
Commercial Business | Commercial Business
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	254,338	333,627
Year one	346,152	225,314
Year two	204,481	97,988
Year three	94,152	115,739
Year four	65,378	78,838
Prior	119,926	80,452
Revolving Loans	420,453	523,927
Total loans	1,504,880	1,455,885
Current period gross charge-offs, current year	0	174
Current period gross charge-offs, year one	9	0
Current period gross charge-offs, year two	324	0
Current period gross charge-offs, year three	0	0
Current period gross charge-offs, year four	0	138
Current period gross charge-offs, prior	116	404
Current period gross charge-offs, revolving loans	0	0
Current period gross charge-offs, total	449	716
Commercial Business | Commercial Business | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	247,081	330,598
Year one	344,034	223,245
Year two	202,020	95,787
Year three	92,198	105,922
Year four	62,413	77,891
Prior	118,061	78,009
Revolving Loans	410,856	508,839
Total loans	1,476,663	1,420,291
Commercial Business | Commercial Business | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	532	127
Year one	45	458
Year two	180	1,107
Year three	1,037	7,787
Year four	1,040	498
Prior	294	322
Revolving Loans	3,635	13,225
Total loans	6,763	23,524
Commercial Business | Commercial Business | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	6,725	2,902
Year one	2,073	1,611
Year two	2,281	1,094
Year three	917	2,030
Year four	1,925	449
Prior	1,571	2,121
Revolving Loans	5,962	1,863
Total loans	21,454	12,070
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	13,069	7,626
Year one	5,741	2,926
Year two	2,279	1,300
Year three	1,041	2,943
Year four	2,659	3,236
Prior	34,168	34,349
Revolving Loans	358,585	380,577
Total loans	417,542	432,957
Current period gross charge-offs, current year	0	0
Current period gross charge-offs, year one	20	5
Current period gross charge-offs, year two	28	15
Current period gross charge-offs, year three	0	0
Current period gross charge-offs, year four	15	13
Current period gross charge-offs, prior	1,735	20
Current period gross charge-offs, revolving loans	207	181
Current period gross charge-offs, total	2,005	234
Consumer | 660-850
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	11,452	6,689
Year one	4,960	2,346
Year two	1,823	1,201
Year three	519	2,147
Year four	1,662	2,047
Prior	24,543	23,170
Revolving Loans	333,382	359,468
Total loans	378,341	397,068
Consumer | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,209	658
Year one	192	467
Year two	237	59
Year three	425	198
Year four	209	664
Prior	3,954	5,459
Revolving Loans	12,668	11,269
Total loans	18,894	18,774
Consumer | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	24	123
Year one	374	56
Year two	87	0
Year three	47	465
Year four	500	316
Prior	2,868	2,802
Revolving Loans	5,920	3,824
Total loans	9,820	7,586
Consumer | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	384	156
Year one	215	57
Year two	132	40
Year three	50	133
Year four	288	209
Prior	2,803	2,918
Revolving Loans	6,615	6,016
Total loans	$ 10,487	$ 9,529