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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Classes of loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	$ 4,538,114		$ 4,761,848
Allowance for credit losses	(64,749)	$ (64,815)	(64,760)	$ (64,915)	$ (65,255)	$ (64,670)
Deferred loan fees and gains, net	(5,682)		(6,695)
Loans receivable, net	$ 4,467,683		$ 4,690,393
Weighted average interest rate	6.11%		6.08%
One- to four-family residential construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	$ 21,856		$ 30,533
Subdivision construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	25,452		19,861
Land development
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	32,725		42,504
Commercial construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	242,936		352,793
Owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	672,276		710,446
Non-owner occupied one- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	124,516		122,901
Commercial real estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	1,530,990		1,543,742
Other residential (multi-family)
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	1,485,546		1,549,249
Commercial business
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	230,299		220,291
Consumer auto
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	24,447		25,787
Consumer other
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	23,712		27,905
Home equity lines of credit
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans receivable	$ 123,359		$ 115,836

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