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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Provision for credit losses	$ (1,384)	$ (1,967)	$ (10,134)	$ (5,344)
Recoveries	1,050	734	2,622	3,931
Charge-offs	(3,228)	(964)	(8,570)	(4,333)
Financing Receivable, Allowance for Credit Loss	159,707	154,585	159,707	154,585	$ 155,521	$ 160,501	$ 152,848	$ 149,643
Commercial Real Estate
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Provision for credit losses	(119)	(911)	(215)	(5,549)
Recoveries	36	65	146	1,552
Charge-offs	0	0	0	(347)
Financing Receivable, Allowance for Credit Loss	41,191	40,040	41,191	40,040	40,830	41,036	39,064	44,384
Multifamily Real Estate
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Provision for credit losses	(17)	(1,980)	(407)	(907)
Recoveries	0	0	0	0
Charge-offs	0	0	0	0
Financing Receivable, Allowance for Credit Loss	9,901	10,233	9,901	10,233	10,308	9,918	8,253	9,326
Construction and Land
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Provision for credit losses	(513)	(3,130)	(5,599)	(372)
Recoveries	725	0	725	0
Charge-offs	(218)	(145)	(218)	(145)
Financing Receivable, Allowance for Credit Loss	35,144	28,322	35,144	28,322	29,038	34,124	31,597	28,095
Commercial Business and Small Business Scored
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Provision for credit losses	(526)	(745)	(2,729)	(4,957)
Recoveries	99	613	1,017	1,718
Charge-offs	(518)	(414)	(4,711)	(2,360)
Financing Receivable, Allowance for Credit Loss	37,646	39,779	37,646	39,779	38,611	38,591	38,835	35,464
Agricultural Business
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Provision for credit losses	(1,007)	(1,294)	(1,847)	(1,173)
Recoveries	99	1	110	302
Charge-offs	(2,054)	0	(2,416)	0
Financing Receivable, Allowance for Credit Loss	5,268	5,340	5,268	5,340	5,727	6,216	4,045	3,865
One- to Four-Family Residential
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Provision for credit losses	(445)	(457)	(568)	(1,145)
Recoveries	13	14	259	47
Charge-offs	0	0	(13)	0
Financing Receivable, Allowance for Credit Loss	20,485	20,463	20,485	20,463	20,807	20,917	20,906	19,271
Consumer Loan [Member]
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Provision for credit losses	(733)	(624)	(719)	(2,339)
Recoveries	78	41	365	312
Charge-offs	(438)	(405)	(1,212)	(1,481)	(1,730)
Financing Receivable, Allowance for Credit Loss	10,072	$ 10,408	10,072	$ 10,408	10,200	$ 9,699	$ 10,148	$ 9,238
Commercial Business
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Charge-offs			(3,202)		$ (4,020)
Financing Receivable, Allowance for Credit Loss	$ 37,646		$ 37,646

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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