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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	$ 141,457	$ 125,471	$ 141,465	$ 132,099
Provision (recapture) for credit losses	3,559	3,144	4,333	(4,232)
Recoveries	753	587	1,451	1,581
Charge-offs	(1,089)	(500)	(2,569)	(746)
Allowance for loan losses, Ending balance	144,680	128,702	144,680	128,702
Commercial Real Estate
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	42,975	47,264	44,086	52,995
Provision (recapture) for credit losses	587	(1,020)	(708)	(6,836)
Recoveries	74	129	258	216
Charge-offs	0	0	0	(2)
Allowance for loan losses, Ending balance	43,636	46,373	43,636	46,373
Multifamily Real Estate
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	8,475	7,183	7,734	7,043
Provision (recapture) for credit losses	(436)	(277)	305	(137)
Recoveries	0	0	0	0
Charge-offs	0	0	0	0
Allowance for loan losses, Ending balance	8,039	6,906	8,039	6,906
Construction and Land
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	28,433	26,679	29,171	27,294
Provision (recapture) for credit losses	1,567	260	829	(734)
Recoveries	0	0	0	384
Charge-offs	(156)	0	(156)	(5)
Allowance for loan losses, Ending balance	29,844	26,939	29,844	26,939
Commercial Business and Small Business Scored
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	33,735	26,655	33,299	26,421
Provision (recapture) for credit losses	187	2,032	1,662	2,199
Recoveries	524	234	643	383
Charge-offs	(566)	(248)	(1,724)	(330)
Allowance for loan losses, Ending balance	33,880	28,673	33,880	28,673
Agricultural Business
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	3,094	2,586	3,475	3,190
Provision (recapture) for credit losses	477	402	(13)	(320)
Recoveries	2	14	111	132
Charge-offs	0	0	0	0
Allowance for loan losses, Ending balance	3,573	3,002	3,573	3,002
One- to Four-Family Residential
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	15,736	8,109	14,729	8,205
Provision (recapture) for credit losses	969	1,366	1,889	1,230
Recoveries	36	98	153	138
Charge-offs	(4)	0	(34)	0
Allowance for loan losses, Ending balance	16,737	9,573	16,737	9,573
Consumer-other
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	9,009	6,995	8,971	6,951
Provision (recapture) for credit losses	208	381	369	366
Recoveries	117	112	286	328
Charge-offs	(363)	(252)	(655)	(409)
Allowance for loan losses, Ending balance	$ 8,971	$ 7,236	8,971	$ 7,236
Commercial Business
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Charge-offs			$ (860)

X

- Definition

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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Amount of credit loss expense (reversal of expense) for financing receivable.

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