LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans by Risk Rating (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current period gross write-offs
Total	$ 29,257	$ 28,058	$ 31,018
Payment performance
Total	9,039,686	8,335,309
Commercial loans | Construction
Current period gross write-offs
Write-offs, originated in current year	0
Write-offs, originated in prior year	0
Write-offs, originated two years before current year	0
Write-offs, originated three years before current year	0
Write-offs, originated four years before current year	0
Write-offs, originated five years before current year	1
Write-offs, Revolving Loans Amortized Cost Basis	0
Write-offs, Revolving Loans Converted to Term	0
Total	1	0	0
Payment performance
Loans originated in current fiscal year	104,507	153,393
Loans originated in fiscal year before current fiscal year	346,419	133,708
Loans originated two years before current fiscal year	156,626	25,634
Loans originated three years before current fiscal year	29,176	3,432
Loans originated four years before current fiscal year	2,545	1,361
Prior	1,098	1,924
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	640,371	319,452
Commercial loans | Commercial multifamily
Current period gross write-offs
Write-offs, originated in current year	0
Write-offs, originated in prior year	0
Write-offs, originated two years before current year	0
Write-offs, originated three years before current year	0
Write-offs, originated four years before current year	0
Write-offs, originated five years before current year	0
Write-offs, Revolving Loans Amortized Cost Basis	0
Write-offs, Revolving Loans Converted to Term	0
Total	0	94	404
Payment performance
Loans originated in current fiscal year	16,020	205,124
Loans originated in fiscal year before current fiscal year	216,477	61,032
Loans originated two years before current fiscal year	57,059	30,211
Loans originated three years before current fiscal year	29,120	100,696
Loans originated four years before current fiscal year	94,733	73,187
Prior	185,359	149,633
Revolving Loans Amortized Cost Basis	377	205
Revolving Loans Converted to Term	0	0
Total	599,145	620,088
Commercial real estate loans | Commercial real estate owner occupied
Current period gross write-offs
Write-offs, originated in current year	0
Write-offs, originated in prior year	0
Write-offs, originated two years before current year	0
Write-offs, originated three years before current year	380
Write-offs, originated four years before current year	0
Write-offs, originated five years before current year	109
Write-offs, Revolving Loans Amortized Cost Basis	0
Write-offs, Revolving Loans Converted to Term	0
Total	489	687	1,640
Payment performance
Loans originated in current fiscal year	97,271	132,099
Loans originated in fiscal year before current fiscal year	120,327	127,392
Loans originated two years before current fiscal year	122,656	59,253
Loans originated three years before current fiscal year	38,183	82,858
Loans originated four years before current fiscal year	75,096	76,378
Prior	172,460	159,045
Revolving Loans Amortized Cost Basis	2,653	3,464
Revolving Loans Converted to Term	0	0
Total	628,646	640,489
Commercial real estate loans | Commercial real estate non-owner occupied
Current period gross write-offs
Write-offs, originated in current year	0
Write-offs, originated in prior year	0
Write-offs, originated two years before current year	0
Write-offs, originated three years before current year	0
Write-offs, originated four years before current year	0
Write-offs, originated five years before current year	65
Write-offs, Revolving Loans Amortized Cost Basis	0
Write-offs, Revolving Loans Converted to Term	0
Total	65	5,894	14,557
Payment performance
Loans originated in current fiscal year	404,687	621,685
Loans originated in fiscal year before current fiscal year	591,897	410,359
Loans originated two years before current fiscal year	385,247	182,693
Loans originated three years before current fiscal year	142,177	347,406
Loans originated four years before current fiscal year	310,818	348,734
Prior	767,030	567,514
Revolving Loans Amortized Cost Basis	4,553	17,846
Revolving Loans Converted to Term	0	0
Total	2,606,409	2,496,237
Commercial and industrial loans
Current period gross write-offs
Write-offs, originated in current year	0
Write-offs, originated in prior year	1,154
Write-offs, originated two years before current year	863
Write-offs, originated three years before current year	2,763
Write-offs, originated four years before current year	1,496
Write-offs, originated five years before current year	9,283
Write-offs, Revolving Loans Amortized Cost Basis	2,313
Write-offs, Revolving Loans Converted to Term	0
Total	17,872	18,447	10,841
Payment performance
Loans originated in current fiscal year	143,904	282,985
Loans originated in fiscal year before current fiscal year	227,036	153,377
Loans originated two years before current fiscal year	133,628	61,810
Loans originated three years before current fiscal year	72,478	77,446
Loans originated four years before current fiscal year	43,832	96,706
Prior	126,661	103,134
Revolving Loans Amortized Cost Basis	611,710	669,778
Revolving Loans Converted to Term	0	0
Total	1,359,249	1,445,236
Residential real estate | Residential real estate
Current period gross write-offs
Write-offs, originated in current year	0
Write-offs, originated in prior year	50
Write-offs, originated two years before current year	0
Write-offs, originated three years before current year	50
Write-offs, originated four years before current year	174
Write-offs, originated five years before current year	39
Write-offs, Revolving Loans Amortized Cost Basis	0
Write-offs, Revolving Loans Converted to Term	0
Total	313	555	1,664
Payment performance
Loans originated in current fiscal year	599,124	997,981
Loans originated in fiscal year before current fiscal year	973,160	280,956
Loans originated two years before current fiscal year	267,231	96,996
Loans originated three years before current fiscal year	88,681	71,973
Loans originated four years before current fiscal year	67,551	140,953
Prior	764,484	723,423
Revolving Loans Amortized Cost Basis	81	165
Revolving Loans Converted to Term	0	0
Total	2,760,312	2,312,447
Consumer loans | Home equity
Current period gross write-offs
Write-offs, originated in current year	0
Write-offs, originated in prior year	0
Write-offs, originated two years before current year	0
Write-offs, originated three years before current year	70
Write-offs, originated four years before current year	0
Write-offs, originated five years before current year	0
Write-offs, Revolving Loans Amortized Cost Basis	18
Write-offs, Revolving Loans Converted to Term	0
Total	88	166	334
Payment performance
Loans originated in current fiscal year	0	0
Loans originated in fiscal year before current fiscal year	0	114
Loans originated two years before current fiscal year	0	454
Loans originated three years before current fiscal year	439	0
Loans originated four years before current fiscal year	0	0
Prior	2,614	17
Revolving Loans Amortized Cost Basis	221,170	226,865
Revolving Loans Converted to Term	0	0
Total	224,223	227,450
Consumer loans | Consumer other
Current period gross write-offs
Write-offs, originated in current year	109
Write-offs, originated in prior year	8,843
Write-offs, originated two years before current year	1,149
Write-offs, originated three years before current year	11
Write-offs, originated four years before current year	78
Write-offs, originated five years before current year	239
Write-offs, Revolving Loans Amortized Cost Basis	0
Write-offs, Revolving Loans Converted to Term	0
Total	10,429	2,215	$ 1,578
Payment performance
Loans originated in current fiscal year	49,665	161,745
Loans originated in fiscal year before current fiscal year	108,388	28,416
Loans originated two years before current fiscal year	19,726	8,356
Loans originated three years before current fiscal year	5,869	12,950
Loans originated four years before current fiscal year	7,164	28,085
Prior	19,871	25,249
Revolving Loans Amortized Cost Basis	10,648	9,109
Revolving Loans Converted to Term	0	0
Total	221,331	273,910
Pass | Commercial loans | Construction
Payment performance
Loans originated in current fiscal year	104,507	153,393
Loans originated in fiscal year before current fiscal year	346,419	133,708
Loans originated two years before current fiscal year	138,802	25,634
Loans originated three years before current fiscal year	29,176	3,432
Loans originated four years before current fiscal year	2,545	1,361
Prior	1,098	1,924
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	622,547	319,452
Pass | Commercial loans | Commercial multifamily
Payment performance
Loans originated in current fiscal year	16,020	205,124
Loans originated in fiscal year before current fiscal year	216,477	61,032
Loans originated two years before current fiscal year	56,817	27,583
Loans originated three years before current fiscal year	26,566	100,696
Loans originated four years before current fiscal year	94,733	67,675
Prior	179,923	149,633
Revolving Loans Amortized Cost Basis	377	205
Revolving Loans Converted to Term	0	0
Total	590,913	611,948
Pass | Commercial real estate loans | Commercial real estate owner occupied
Payment performance
Loans originated in current fiscal year	97,271	131,096
Loans originated in fiscal year before current fiscal year	120,327	127,270
Loans originated two years before current fiscal year	122,151	58,835
Loans originated three years before current fiscal year	37,914	82,576
Loans originated four years before current fiscal year	70,393	75,322
Prior	165,224	154,056
Revolving Loans Amortized Cost Basis	2,653	3,464
Revolving Loans Converted to Term	0	0
Total	615,933	632,619
Pass | Commercial real estate loans | Commercial real estate non-owner occupied
Payment performance
Loans originated in current fiscal year	404,687	621,685
Loans originated in fiscal year before current fiscal year	591,897	410,359
Loans originated two years before current fiscal year	385,247	175,456
Loans originated three years before current fiscal year	135,134	333,783
Loans originated four years before current fiscal year	277,870	313,124
Prior	736,566	530,322
Revolving Loans Amortized Cost Basis	4,553	17,846
Revolving Loans Converted to Term	0	0
Total	2,535,954	2,402,575
Pass | Commercial and industrial loans
Payment performance
Loans originated in current fiscal year	142,946	282,781
Loans originated in fiscal year before current fiscal year	203,126	147,070
Loans originated two years before current fiscal year	118,191	56,880
Loans originated three years before current fiscal year	69,722	67,975
Loans originated four years before current fiscal year	39,437	83,223
Prior	112,770	99,367
Revolving Loans Amortized Cost Basis	554,153	648,956
Revolving Loans Converted to Term	0	0
Total	1,240,345	1,386,252
Pass | Residential real estate | Residential real estate
Payment performance
Loans originated in current fiscal year	599,124	997,981
Loans originated in fiscal year before current fiscal year	973,031	280,308
Loans originated two years before current fiscal year	266,055	96,548
Loans originated three years before current fiscal year	88,302	70,845
Loans originated four years before current fiscal year	66,837	138,894
Prior	755,372	713,744
Revolving Loans Amortized Cost Basis	81	165
Revolving Loans Converted to Term	0	0
Total	2,748,802	2,298,485
Special Mention | Commercial loans | Construction
Payment performance
Loans originated in current fiscal year	0	0
Loans originated in fiscal year before current fiscal year	0	0
Loans originated two years before current fiscal year	512	0
Loans originated three years before current fiscal year	0	0
Loans originated four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	512	0
Special Mention | Commercial loans | Commercial multifamily
Payment performance
Loans originated in current fiscal year	0	0
Loans originated in fiscal year before current fiscal year	0	0
Loans originated two years before current fiscal year	0	2,628
Loans originated three years before current fiscal year	0	0
Loans originated four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	2,628
Special Mention | Commercial real estate loans | Commercial real estate owner occupied
Payment performance
Loans originated in current fiscal year	0	0
Loans originated in fiscal year before current fiscal year	0	0
Loans originated two years before current fiscal year	424	387
Loans originated three years before current fiscal year	222	0
Loans originated four years before current fiscal year	0	0
Prior	788	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	1,434	387
Special Mention | Commercial real estate loans | Commercial real estate non-owner occupied
Payment performance
Loans originated in current fiscal year	0	0
Loans originated in fiscal year before current fiscal year	0	0
Loans originated two years before current fiscal year	0	0
Loans originated three years before current fiscal year	229	0
Loans originated four years before current fiscal year	19,465	20,000
Prior	726	18,462
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	20,420	38,462
Special Mention | Commercial and industrial loans
Payment performance
Loans originated in current fiscal year	526	0
Loans originated in fiscal year before current fiscal year	23,149	5,811
Loans originated two years before current fiscal year	3,735	1,290
Loans originated three years before current fiscal year	1,621	1,332
Loans originated four years before current fiscal year	610	11,502
Prior	1,353	912
Revolving Loans Amortized Cost Basis	35,244	2,632
Revolving Loans Converted to Term	0	0
Total	66,238	23,479
Special Mention | Residential real estate | Residential real estate
Payment performance
Loans originated in current fiscal year	0	0
Loans originated in fiscal year before current fiscal year	0	364
Loans originated two years before current fiscal year	0	0
Loans originated three years before current fiscal year	0	861
Loans originated four years before current fiscal year	140	202
Prior	664	707
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	804	2,134
Substandard | Commercial loans | Construction
Payment performance
Loans originated in current fiscal year	0	0
Loans originated in fiscal year before current fiscal year	0	0
Loans originated two years before current fiscal year	17,312	0
Loans originated three years before current fiscal year	0	0
Loans originated four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	17,312	0
Substandard | Commercial loans | Commercial multifamily
Payment performance
Loans originated in current fiscal year	0	0
Loans originated in fiscal year before current fiscal year	0	0
Loans originated two years before current fiscal year	242	0
Loans originated three years before current fiscal year	2,554	0
Loans originated four years before current fiscal year	0	5,512
Prior	5,436	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	8,232	5,512
Substandard | Commercial real estate loans | Commercial real estate owner occupied
Payment performance
Loans originated in current fiscal year	0	1,003
Loans originated in fiscal year before current fiscal year	0	122
Loans originated two years before current fiscal year	81	31
Loans originated three years before current fiscal year	47	282
Loans originated four years before current fiscal year	4,703	1,056
Prior	6,448	4,989
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	11,279	7,483
Substandard | Commercial real estate loans | Commercial real estate non-owner occupied
Payment performance
Loans originated in current fiscal year	0	0
Loans originated in fiscal year before current fiscal year	0	0
Loans originated two years before current fiscal year	0	7,237
Loans originated three years before current fiscal year	6,814	13,623
Loans originated four years before current fiscal year	13,483	15,610
Prior	29,738	18,730
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	50,035	55,200
Substandard | Commercial and industrial loans
Payment performance
Loans originated in current fiscal year	432	204
Loans originated in fiscal year before current fiscal year	761	496
Loans originated two years before current fiscal year	11,702	3,640
Loans originated three years before current fiscal year	1,135	8,139
Loans originated four years before current fiscal year	3,785	1,981
Prior	12,538	2,799
Revolving Loans Amortized Cost Basis	22,313	10,581
Revolving Loans Converted to Term	0	0
Total	52,666	27,840
Substandard | Residential real estate | Residential real estate
Payment performance
Loans originated in current fiscal year	0	0
Loans originated in fiscal year before current fiscal year	129	284
Loans originated two years before current fiscal year	1,176	448
Loans originated three years before current fiscal year	379	267
Loans originated four years before current fiscal year	574	1,857
Prior	8,448	8,972
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	10,706	11,828
Doubtful | Commercial and industrial loans
Payment performance
Loans originated in current fiscal year		0
Loans originated in fiscal year before current fiscal year		0
Loans originated two years before current fiscal year		0
Loans originated three years before current fiscal year		0
Loans originated four years before current fiscal year		0
Prior		56
Revolving Loans Amortized Cost Basis		7,609
Revolving Loans Converted to Term		0
Total		7,665
Performing | Consumer loans | Home equity
Payment performance
Loans originated in current fiscal year	0	0
Loans originated in fiscal year before current fiscal year	0	114
Loans originated two years before current fiscal year	0	454
Loans originated three years before current fiscal year	439	0
Loans originated four years before current fiscal year	0	0
Prior	2,614	17
Revolving Loans Amortized Cost Basis	220,209	224,746
Revolving Loans Converted to Term	0	0
Total	223,262	225,331
Performing | Consumer loans | Consumer other
Payment performance
Loans originated in current fiscal year	49,588	161,157
Loans originated in fiscal year before current fiscal year	108,284	28,279
Loans originated two years before current fiscal year	19,679	8,312
Loans originated three years before current fiscal year	5,843	12,670
Loans originated four years before current fiscal year	7,054	27,608
Prior	19,587	24,682
Revolving Loans Amortized Cost Basis	10,614	9,070
Revolving Loans Converted to Term	0	0
Total	220,649	271,778
Performing | Special Mention
Payment performance
Total	91,502	68,127
Performing | Substandard
Payment performance
Total	131,689	88,665
Nonperforming | Consumer loans | Home equity
Payment performance
Loans originated in current fiscal year	0	0
Loans originated in fiscal year before current fiscal year	0	0
Loans originated two years before current fiscal year	0	0
Loans originated three years before current fiscal year	0	0
Loans originated four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	961	2,119
Revolving Loans Converted to Term	0	0
Total	961	2,119
Nonperforming | Consumer loans | Consumer other
Payment performance
Loans originated in current fiscal year	77	588
Loans originated in fiscal year before current fiscal year	104	137
Loans originated two years before current fiscal year	47	44
Loans originated three years before current fiscal year	26	280
Loans originated four years before current fiscal year	110	477
Prior	284	567
Revolving Loans Amortized Cost Basis	34	39
Revolving Loans Converted to Term	0	0
Total	$ 682	$ 2,132