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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
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	$ 152,848	$ 144,680	$ 149,643	$ 141,465
Provision for credit losses	1,967	2,943	5,344	7,276
Recoveries	734	806	3,931	2,257
Charge-offs	(964)	(1,469)	(4,333)	(4,038)
Allowance for loan losses, Ending balance	154,585	146,960	154,585	146,960
Commercial Real Estate
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	39,064	43,636	44,384	44,086
Provision for credit losses	911	210	5,549	498
Recoveries	65	170	1,552	428
Charge-offs	0	0	(347)	0
Allowance for loan losses, Ending balance	40,040	44,016	40,040	44,016
Multifamily Real Estate
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	8,253	8,039	9,326	7,734
Provision for credit losses	1,980	765	907	1,070
Recoveries	0	0	0	0
Charge-offs	0	0	0	0
Allowance for loan losses, Ending balance	10,233	8,804	10,233	8,804
Construction and Land
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	31,597	29,844	28,095	29,171
Provision for credit losses	3,130	484	372	345
Recoveries	0	29	0	29
Charge-offs	(145)	0	(145)	(156)
Allowance for loan losses, Ending balance	28,322	29,389	28,322	29,389
Commercial Business and Small Business Scored
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	38,835	33,880	35,464	33,299
Provision for credit losses	745	398	4,957	2,060
Recoveries	613	403	1,718	1,046
Charge-offs	(414)	(616)	(2,360)	(2,340)
Allowance for loan losses, Ending balance	39,779	34,065	39,779	34,065
Agricultural Business
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	4,045	3,573	3,865	3,475
Provision for credit losses	1,294	690	1,173	677
Recoveries	1	19	302	130
Charge-offs	0	(564)	0	(564)
Allowance for loan losses, Ending balance	5,340	3,718	5,340	3,718
One- to Four-Family Residential
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	20,906	16,737	19,271	14,729
Provision for credit losses	457	1,129	1,145	3,018
Recoveries	14	59	47	212
Charge-offs	0	0	0	(34)
Allowance for loan losses, Ending balance	20,463	17,925	20,463	17,925
Consumer Loan [Member]
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	10,148	8,971	9,238	8,971
Provision for credit losses	624	235	2,339	604
Recoveries	41	126	312	412
Charge-offs	(405)	(289)	(1,481)	(944)
Allowance for loan losses, Ending balance	$ 10,408	$ 9,043	$ 10,408	$ 9,043

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

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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