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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Classes of loans (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	$ 4,705,108		$ 4,661,348
Allowance for credit losses	(65,255)	$ (65,087)	(64,670)	$ (64,852)	$ (64,987)	$ (63,480)
Deferred loan fees and gains, net	(6,225)		(7,058)
Loans receivable, net	$ 4,633,628		$ 4,589,620
Weighted average interest rate	6.35%		6.25%
One- to four-family residential construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	$ 29,718		$ 29,628
Subdivision construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	19,427		23,359
Land development
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	43,191		48,015
Commercial construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	550,231		703,407
Owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	740,955		769,260
Non-owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	123,168		121,275
Commercial real estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	1,511,672		1,521,032
Other residential (multi-family)
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	1,250,976		942,071
Commercial business
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	255,917		318,050
Industrial revenue bonds
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	11,699		12,047
Consumer auto
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	26,200		28,343
Consumer other
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	28,471		28,978
Home equity lines of credit
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	$ 113,483		$ 115,883

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