LOANS AND ALLOWANCE FOR CREDIT LOSSES - Classes of loans by aging (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	$ 4,658,117	$ 4,661,348
One- to four-family residential construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	33,984	29,628
Subdivision construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	20,252	23,359
Land development
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	45,878	48,015
Commercial construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	692,550	703,407
Owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	757,975	769,260
Non-owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	122,383	121,275
Commercial real estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	1,502,625	1,521,032
Other residential (multi-family)
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	1,040,306	942,071
Commercial business
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	259,476	318,050
Industrial revenue bonds
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	11,812	12,047
Consumer auto
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	26,953	28,343
Consumer other
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	28,524	28,978
Home equity lines of credit
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	115,399	115,883
30-59 Days Past Due
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	17,476	13,125
30-59 Days Past Due | Owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	2,385	2,778
30-59 Days Past Due | Non-owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	503
30-59 Days Past Due | Commercial real estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	13,545	187
30-59 Days Past Due | Other residential (multi-family)
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class		9,572
30-59 Days Past Due | Commercial business
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	823
30-59 Days Past Due | Consumer auto
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	56	116
30-59 Days Past Due | Consumer other
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	107	137
30-59 Days Past Due | Home equity lines of credit
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	57	335
60-89 Days Past Due
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	28	308
60-89 Days Past Due | Owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class		125
60-89 Days Past Due | Commercial real estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class		92
60-89 Days Past Due | Consumer auto
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	20	65
60-89 Days Past Due | Consumer other
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	8
60-89 Days Past Due | Home equity lines of credit
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class		26
Over 90 Days Past Due
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	21,271	11,748
Over 90 Days Past Due | Land development
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	384	384
Over 90 Days Past Due | Owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	626	722
Over 90 Days Past Due | Commercial real estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	10,612	10,552
Over 90 Days Past Due | Other residential (multi-family)
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	9,572
Over 90 Days Past Due | Commercial business
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class		31
Over 90 Days Past Due | Consumer auto
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	9	8
Over 90 Days Past Due | Consumer other
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	27	42
Over 90 Days Past Due | Home equity lines of credit
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	41	9
Total Past Due
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	38,775	25,181
Total Past Due | Land development
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	384	384
Total Past Due | Owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	3,011	3,625
Total Past Due | Non-owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	503
Total Past Due | Commercial real estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	24,157	10,831
Total Past Due | Other residential (multi-family)
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	9,572	9,572
Total Past Due | Commercial business
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	823	31
Total Past Due | Consumer auto
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	85	189
Total Past Due | Consumer other
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	142	179
Total Past Due | Home equity lines of credit
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	98	370
Current
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	4,619,342	4,636,167
Current | One- to four-family residential construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	33,984	29,628
Current | Subdivision construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	20,252	23,359
Current | Land development
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	45,494	47,631
Current | Commercial construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	692,550	703,407
Current | Owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	754,964	765,635
Current | Non-owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	121,880	121,275
Current | Commercial real estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	1,478,468	1,510,201
Current | Other residential (multi-family)
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	1,030,734	932,499
Current | Commercial business
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	258,653	318,019
Current | Industrial revenue bonds
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	11,812	12,047
Current | Consumer auto
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	26,868	28,154
Current | Consumer other
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	28,382	28,799
Current | Home equity lines of credit
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	$ 115,301	$ 115,513