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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Classes of loans (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	$ 4,781,953		$ 4,661,348
Allowance for credit losses	(64,915)	$ (65,255)	(64,670)	$ (64,753)	$ (64,852)	$ (63,480)
Deferred loan fees and gains, net	(5,762)		(7,058)
Loans receivable, net	$ 4,711,276		$ 4,589,620
Weighted average interest rate	6.30%		6.25%
One- to four-family residential construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	$ 27,643		$ 29,628
Subdivision construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	20,077		23,359
Land development
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	39,023		48,015
Commercial construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	334,299		703,407
Owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	716,572		769,260
Non-owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	121,834		121,275
Commercial real estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	1,546,005		1,521,032
Other residential (multi-family)
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	1,569,879		942,071
Commercial business
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	227,037		318,050
Industrial revenue bonds
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	11,632		12,047
Consumer auto
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	25,870		28,343
Consumer other
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	27,353		28,978
Home equity lines of credit
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	$ 114,729		$ 115,883

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