LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Nonperforming Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 3,909,753	$ 3,634,792
1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	10,338	27,539
One fiscal year before current year	22,977	9,137
Two fiscal years before current year	6,740	857
Three fiscal years before current year	740	66
Four fiscal years before current year	64	0
More than four fiscal years before current year	0	0
Revolving Loans Amortized Cost Basis	131	223
Revolving Loans Converted to Term	0	0
Total	40,990	37,822
Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	19,051	14,383
One fiscal year before current year	16,290	14,621
Two fiscal years before current year	12,999	9,573
Three fiscal years before current year	8,539	10,594
Four fiscal years before current year	8,645	7,240
More than four fiscal years before current year	41,553	39,955
Revolving Loans Amortized Cost Basis	8,759	8,151
Revolving Loans Converted to Term	0	0
Total	115,836	104,517
Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	121,438	232,685
One fiscal year before current year	226,720	178,639
Two fiscal years before current year	165,680	111,560
Three fiscal years before current year	100,179	63,001
Four fiscal years before current year	54,824	74,394
More than four fiscal years before current year	203,543	162,781
Revolving Loans Amortized Cost Basis	3,590	3,669
Revolving Loans Converted to Term	0	0
Total	875,974	826,729
Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	13,080	20,617
One fiscal year before current year	18,915	11,256
Two fiscal years before current year	9,713	7,239
Three fiscal years before current year	5,922	4,407
Four fiscal years before current year	3,477	3,592
More than four fiscal years before current year	10,395	9,158
Revolving Loans Amortized Cost Basis	710	420
Revolving Loans Converted to Term	0	0
Total	62,212	56,689
Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	4,003	5,313
One fiscal year before current year	4,197	3,596
Two fiscal years before current year	4,268	3,094
Three fiscal years before current year	3,035	2,596
Four fiscal years before current year	2,338	2,977
More than four fiscal years before current year	10,927	8,960
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	28,768	26,536
Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	4,469	7,058
One fiscal year before current year	5,696	5,461
Two fiscal years before current year	4,096	4,680
Three fiscal years before current year	3,333	2,457
Four fiscal years before current year	1,757	682
More than four fiscal years before current year	815	524
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	20,166	20,862
Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	16,322	30,627
One fiscal year before current year	22,185	11,187
Two fiscal years before current year	7,619	4,633
Three fiscal years before current year	3,124	1,476
Four fiscal years before current year	1,011	319
More than four fiscal years before current year	1,504	1,434
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	51,765	49,676
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,190,184	1,117,706
Performing | 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	10,338	27,539
One fiscal year before current year	22,977	9,137
Two fiscal years before current year	6,740	857
Three fiscal years before current year	740	66
Four fiscal years before current year	64	0
More than four fiscal years before current year	0	0
Revolving Loans Amortized Cost Basis	131	223
Revolving Loans Converted to Term	0	0
Total	40,990	37,822
Performing | Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	19,051	14,383
One fiscal year before current year	16,290	14,621
Two fiscal years before current year	12,999	9,564
Three fiscal years before current year	8,529	10,584
Four fiscal years before current year	8,637	6,863
More than four fiscal years before current year	40,985	39,527
Revolving Loans Amortized Cost Basis	8,759	8,151
Revolving Loans Converted to Term	0	0
Total	115,250	103,693
Performing | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	121,438	232,606
One fiscal year before current year	226,101	178,380
Two fiscal years before current year	165,399	111,333
Three fiscal years before current year	99,774	62,850
Four fiscal years before current year	54,696	74,136
More than four fiscal years before current year	201,139	160,402
Revolving Loans Amortized Cost Basis	3,401	3,475
Revolving Loans Converted to Term	0	0
Total	871,948	823,182
Performing | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	13,080	20,617
One fiscal year before current year	18,915	11,256
Two fiscal years before current year	9,713	7,239
Three fiscal years before current year	5,919	4,407
Four fiscal years before current year	3,477	3,508
More than four fiscal years before current year	10,243	9,095
Revolving Loans Amortized Cost Basis	665	420
Revolving Loans Converted to Term	0	0
Total	62,012	56,542
Performing | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	4,003	5,313
One fiscal year before current year	4,197	3,596
Two fiscal years before current year	4,268	3,090
Three fiscal years before current year	3,030	2,592
Four fiscal years before current year	2,318	2,977
More than four fiscal years before current year	10,903	8,955
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	28,719	26,523
Performing | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	4,469	7,047
One fiscal year before current year	5,696	5,448
Two fiscal years before current year	4,080	4,668
Three fiscal years before current year	3,324	2,457
Four fiscal years before current year	1,752	682
More than four fiscal years before current year	815	524
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	20,136	20,826
Performing | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	16,282	30,423
One fiscal year before current year	21,765	11,017
Two fiscal years before current year	7,565	4,537
Three fiscal years before current year	3,084	1,451
Four fiscal years before current year	1,005	316
More than four fiscal years before current year	1,428	1,374
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	51,129	49,118
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total	5,527	5,125
Nonperforming | 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One fiscal year before current year	0	0
Two fiscal years before current year	0	0
Three fiscal years before current year	0	0
Four fiscal years before current year	0	0
More than four fiscal years before current year	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Nonperforming | Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One fiscal year before current year	0	0
Two fiscal years before current year	0	9
Three fiscal years before current year	10	10
Four fiscal years before current year	8	377
More than four fiscal years before current year	568	428
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	586	824
Nonperforming | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	79
One fiscal year before current year	619	259
Two fiscal years before current year	281	227
Three fiscal years before current year	405	151
Four fiscal years before current year	128	258
More than four fiscal years before current year	2,404	2,379
Revolving Loans Amortized Cost Basis	189	194
Revolving Loans Converted to Term	0	0
Total	4,026	3,547
Nonperforming | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One fiscal year before current year	0	0
Two fiscal years before current year	0	0
Three fiscal years before current year	3	0
Four fiscal years before current year	0	84
More than four fiscal years before current year	152	63
Revolving Loans Amortized Cost Basis	45	0
Revolving Loans Converted to Term	0	0
Total	200	147
Nonperforming | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One fiscal year before current year	0	0
Two fiscal years before current year	0	4
Three fiscal years before current year	5	4
Four fiscal years before current year	20	0
More than four fiscal years before current year	24	5
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	49	13
Nonperforming | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	11
One fiscal year before current year	0	13
Two fiscal years before current year	16	12
Three fiscal years before current year	9	0
Four fiscal years before current year	5	0
More than four fiscal years before current year	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	30	36
Nonperforming | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	40	204
One fiscal year before current year	420	170
Two fiscal years before current year	54	96
Three fiscal years before current year	40	25
Four fiscal years before current year	6	3
More than four fiscal years before current year	76	60
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	$ 636	$ 558