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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Classes of loans by aging (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	$ 4,590,500	$ 4,581,381
One- to four-family residential construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	31,531	33,849
Subdivision construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	26,513	32,067
Land development
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	53,203	41,613
Commercial construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	705,457	757,690
Owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	777,978	778,533
Non-owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	123,238	124,870
Commercial real estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	1,497,659	1,530,663
Other residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	885,394	781,761
Commercial business
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	294,600	293,228
Industrial revenue bonds
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	12,355	12,852
Consumer auto
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	33,008	37,281
Consumer other
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	34,663	33,732
Home equity lines of credit
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	114,901	123,242
30-59 Days Past Due
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	1,198	3,394
30-59 Days Past Due | Owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	568	2,568
30-59 Days Past Due | Non-owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	23
30-59 Days Past Due | Commercial real estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	165	196
30-59 Days Past Due | Commercial business
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class		8
30-59 Days Past Due | Consumer auto
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	39	100
30-59 Days Past Due | Consumer other
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	359	288
30-59 Days Past Due | Home equity lines of credit
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	44	234
60-89 Days Past Due
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	41	711
60-89 Days Past Due | Owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class		462
60-89 Days Past Due | Non-owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class		63
60-89 Days Past Due | Consumer auto
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	4	34
60-89 Days Past Due | Consumer other
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	5	114
60-89 Days Past Due | Home equity lines of credit
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	32	38
Over 90 Days Past Due
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	11,149	3,670
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	359	722
Over 90 Days Past Due | Commercial real estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	10,192	1,579
Over 90 Days Past Due | Commercial business
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	16	586
Over 90 Days Past Due | Consumer auto
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	35	14
Over 90 Days Past Due | Consumer other
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	136	111
Over 90 Days Past Due | Home equity lines of credit
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	27	274
Total Past Due
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	12,388	7,775
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	927	3,752
Total Past Due | Non-owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	23	63
Total Past Due | Commercial real estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	10,357	1,775
Total Past Due | Commercial business
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	16	594
Total Past Due | Consumer auto
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	78	148
Total Past Due | Consumer other
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	500	513
Total Past Due | Home equity lines of credit
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	103	546
Current
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	4,578,112	4,573,606
Current | One- to four-family residential construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	31,531	33,849
Current | Subdivision construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	26,513	32,067
Current | Land development
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	52,819	41,229
Current | Commercial construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	705,457	757,690
Current | Owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	777,051	774,781
Current | Non-owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	123,215	124,807
Current | Commercial real estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	1,487,302	1,528,888
Current | Other residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	885,394	781,761
Current | Commercial business
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	294,584	292,634
Current | Industrial revenue bonds
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	12,355	12,852
Current | Consumer auto
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	32,930	37,133
Current | Consumer other
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	34,163	33,219
Current | Home equity lines of credit
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Financing receivables by class	$ 114,798	$ 122,696

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-14

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
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