LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for credit losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Balance at beginning of period	$ 64,852	$ 61,058	$ 63,480	$ 60,754
Provision (credit) charged to expense		2,000	1,500	2,000
Losses charged off	(498)	(621)	(1,440)	(1,491)
Recoveries	399	324	1,213	1,498
Balance at end of period	64,753	62,761	64,753	62,761
Allowance for unfunded commitment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Balance at beginning of period	10,371	11,659	12,816	9,629
Provision (credit) charged to expense	(1,195)	1,315	(3,640)	3,345
Balance at end of period	9,176	12,974	9,176	12,974
One- To Four-Family Residential and Construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Balance at beginning of period	11,818	9,434	11,171	9,364
Provision (credit) charged to expense		1,076	647	1,076
Losses charged off			(31)	(38)
Recoveries	41	20	72	128
Balance at end of period	11,859	10,530	11,859	10,530
One- To Four-Family Residential and Construction | Allowance for unfunded commitment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Balance at beginning of period	758	1,138	736	687
Provision (credit) charged to expense	146	(401)	168	50
Balance at end of period	904	737	904	737
Other Residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Balance at beginning of period	13,189	10,612	12,110	10,502
Provision (credit) charged to expense		881	1,079	881
Recoveries				110
Balance at end of period	13,189	11,493	13,189	11,493
Other Residential | Allowance for unfunded commitment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Balance at beginning of period	6,791	7,419	8,624	5,703
Provision (credit) charged to expense	(1,412)	967	(3,245)	2,683
Balance at end of period	5,379	8,386	5,379	8,386
Commercial Real Estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Balance at beginning of period	25,508	28,604	27,096	28,604
Provision (credit) charged to expense		(1,105)	(1,590)	(1,105)
Recoveries		1	2	1
Balance at end of period	25,508	27,500	25,508	27,500
Commercial Real Estate | Allowance for unfunded commitment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Balance at beginning of period	464	501	416	367
Provision (credit) charged to expense	33	17	81	151
Balance at end of period	497	518	497	518
Commercial Construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Balance at beginning of period	2,502	2,797	2,865	2,797
Provision (credit) charged to expense		265	(363)	265
Balance at end of period	2,502	3,062	2,502	3,062
Commercial Construction | Allowance for unfunded commitment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Balance at beginning of period	871	695	802	908
Provision (credit) charged to expense	108	553	177	340
Balance at end of period	979	1,248	979	1,248
Commercial Business
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Balance at beginning of period	7,827	4,365	5,822	4,142
Provision (credit) charged to expense		1,302	1,851	1,302
Losses charged off		(50)		(50)
Recoveries	28	15	182	238
Balance at end of period	7,855	5,632	7,855	5,632
Commercial Business | Allowance for unfunded commitment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Balance at beginning of period	987	1,406	1,734	1,582
Provision (credit) charged to expense	(34)	146	(781)	(30)
Balance at end of period	953	1,552	953	1,552
Consumer
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Balance at beginning of period	4,008	5,246	4,416	5,345
Provision (credit) charged to expense		(419)	(124)	(419)
Losses charged off	(498)	(571)	(1,409)	(1,403)
Recoveries	330	288	957	1,021
Balance at end of period	3,840	4,544	3,840	4,544
Consumer | Allowance for unfunded commitment
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Balance at beginning of period	500	500	504	382
Provision (credit) charged to expense	(36)	33	(40)	151
Balance at end of period	$ 464	$ 533	$ 464	$ 533