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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, 2021	Mar. 31, 2020
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	$ 167,279	$ 100,559
Provision/(recapture) for credit losses	(8,035)	21,713
Recoveries	1,512	2,366
Charge-offs	(4,702)	(1,962)
Allowance for loan losses, Ending balance	156,054	130,488
Impact of Adopting ASC 326
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance		7,812
Commercial Real Estate
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	57,791	30,591
Provision/(recapture) for credit losses	5,359	1,545
Recoveries	24	167
Charge-offs	(3,763)	(100)
Allowance for loan losses, Ending balance	59,411	29,339
Commercial Real Estate | Impact of Adopting ASC 326
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance		(2,864)
Multifamily Real Estate
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	3,893	4,754
Provision/(recapture) for credit losses	474	321
Recoveries	0	0
Charge-offs	0	(66)
Allowance for loan losses, Ending balance	4,367	2,805
Multifamily Real Estate | Impact of Adopting ASC 326
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance		(2,204)
Construction and Land
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	41,295	22,994
Provision/(recapture) for credit losses	(4,955)	8,708
Recoveries	100	0
Charge-offs	0	0
Allowance for loan losses, Ending balance	36,440	34,217
Construction and Land | Impact of Adopting ASC 326
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance		2,515
Commercial Business
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	35,007	23,370
Provision/(recapture) for credit losses	(3,786)	6,447
Recoveries	979	205
Charge-offs	(789)	(1,384)
Allowance for loan losses, Ending balance	31,411	31,648
Commercial Business | Impact of Adopting ASC 326
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance		3,010
Agricultural Business
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	4,914	4,120
Provision/(recapture) for credit losses	(297)	1,006
Recoveries	0	1,750
Charge-offs	0	0
Allowance for loan losses, Ending balance	4,617	4,513
Agricultural Business | Impact of Adopting ASC 326
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance		(351)
One- to Four-Family Residential
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	9,913	4,136
Provision/(recapture) for credit losses	(2,038)	539
Recoveries	113	148
Charge-offs	0	(64)
Allowance for loan losses, Ending balance	7,988	11,884
One- to Four-Family Residential | Impact of Adopting ASC 326
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance		7,125
Consumer
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	14,466	8,202
Provision/(recapture) for credit losses	(2,792)	5,159
Recoveries	296	96
Charge-offs	(150)	(348)
Allowance for loan losses, Ending balance	11,820	16,082
Consumer | Impact of Adopting ASC 326
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance		2,973
Unallocated
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance	0	2,392
Provision/(recapture) for credit losses	0	0
Recoveries	0	0
Charge-offs	0	0
Allowance for loan losses, Ending balance	$ 0	0
Unallocated | Impact of Adopting ASC 326
Financing Receivable, Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, Beginning balance		$ (2,392)

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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