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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	$ 149,643	$ 141,465
Provision (recapture) for credit losses	1,424	774
Recoveries	2,451	698
Charge-offs	(2,378)	(1,480)
Allowance for loan losses, Ending balance	151,140	141,457
Commercial Real Estate
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	44,384	44,086
Provision (recapture) for credit losses	(2,218)	(1,295)
Recoveries	1,389	184
Charge-offs	0	0
Allowance for loan losses, Ending balance	43,555	42,975
Multifamily Real Estate
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	9,326	7,734
Provision (recapture) for credit losses	(33)	741
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, Ending balance	9,293	8,475
Construction and Land
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	28,095	29,171
Provision (recapture) for credit losses	813	(738)
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, Ending balance	28,908	28,433
Commercial Business and Small Business Scored
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	35,464	33,299
Provision (recapture) for credit losses	1,108	1,475
Recoveries	781	119
Charge-offs	(1,809)	(1,158)
Allowance for loan losses, Ending balance	35,544	33,735
Agricultural Business
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	3,865	3,475
Provision (recapture) for credit losses	(81)	(490)
Recoveries	106	109
Charge-offs	0	0
Allowance for loan losses, Ending balance	3,890	3,094
One- to Four-Family Residential
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	19,271	14,729
Provision (recapture) for credit losses	1,145	920
Recoveries	16	117
Charge-offs	0	(30)
Allowance for loan losses, Ending balance	20,432	15,736
Consumer Loan [Member]
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	9,238	8,971
Provision (recapture) for credit losses	690	161
Recoveries	159	169
Charge-offs	(569)	(292)
Allowance for loan losses, Ending balance	$ 9,518	$ 9,009

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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