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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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	$ 128,702	$ 148,009	$ 132,099	$ 167,279
Provision (recapture) for credit losses	6,347	(8,850)	2,115	(24,985)
Recoveries	1,374	1,416	2,955	3,521
Charge-offs	(505)	(660)	(1,251)	(5,900)
Allowance for loan losses, Ending balance	135,918	139,915	135,918	139,915
Commercial Real Estate
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	46,373	60,349	52,995	57,791
Provision (recapture) for credit losses	(2,096)	(4,057)	(8,932)	2,096
Recoveries	88	923	304	1,094
Charge-offs	0	0	(2)	(3,766)
Allowance for loan losses, Ending balance	44,365	57,215	44,365	57,215
Multifamily Real Estate
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	6,906	5,807	7,043	3,893
Provision (recapture) for credit losses	208	850	71	2,764
Recoveries	0	0	0	0
Charge-offs	0	0	0	0
Allowance for loan losses, Ending balance	7,114	6,657	7,114	6,657
Construction and Land
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	26,939	30,899	27,294	41,295
Provision (recapture) for credit losses	1,071	(1,557)	337	(12,053)
Recoveries	0	0	384	100
Charge-offs	(25)	0	(30)	0
Allowance for loan losses, Ending balance	27,985	29,342	27,985	29,342
Commercial Business
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	28,673	30,830	26,421	35,007
Provision (recapture) for credit losses	2,395	(3,825)	4,594	(8,390)
Recoveries	924	230	1,307	1,530
Charge-offs	(138)	(362)	(468)	(1,274)
Allowance for loan losses, Ending balance	31,854	26,873	31,854	26,873
Agricultural Business
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	3,002	3,256	3,190	4,914
Provision (recapture) for credit losses	243	83	(77)	(1,581)
Recoveries	252	17	384	25
Charge-offs	(42)	(179)	(42)	(181)
Allowance for loan losses, Ending balance	3,455	3,177	3,455	3,177
One- to Four-Family Residential
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	9,573	9,800	8,205	9,913
Provision (recapture) for credit losses	2,796	(359)	4,026	(605)
Recoveries	25	19	163	152
Charge-offs	0	0	0	0
Allowance for loan losses, Ending balance	12,394	9,460	12,394	9,460
Consumer
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	7,236	7,068	6,951	14,466
Provision (recapture) for credit losses	1,730	15	2,096	(7,216)
Recoveries	85	227	413	620
Charge-offs	(300)	(119)	(709)	(679)
Allowance for loan losses, Ending balance	$ 8,751	$ 7,191	$ 8,751	$ 7,191

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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