Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				$ 96,485				$ 89,028				$ 85,997	$ 96,485	$ 89,028	$ 85,997
Provision for loan losses	$ 4,000	$ 2,000	$ 2,000	2,000	$ 2,500	$ 2,000	$ 2,000	2,000	$ 2,000	$ 2,000	$ 2,000	2,000	10,000	8,500	8,000
Recoveries													2,465	4,088	3,731
Charge-offs													(8,391)	(5,131)	(8,700)
Ending balance	100,559				96,485				89,028				100,559	96,485	89,028
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance individually evaluated for impairment																$ 4,374	$ 416
Allowance collectively evaluated for impairment																96,107	95,986
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses																	83
Allowance for loan losses	100,559			96,485	96,485			89,028	89,028			85,997	100,559	89,028	85,997	100,559	96,485
Loans individually evaluated for impairment																32,404	20,075
Loans collectively evaluated for impairment																9,257,015	8,650,107
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net																15,938	14,413
Loans receivable																9,305,357	8,684,595
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				27,132				22,824				20,993	27,132	22,824	20,993
Provision for loan losses													4,121	3,063	2,639
Recoveries													476	1,646	372
Charge-offs													(1,138)	(401)	(1,180)
Ending balance	30,591				27,132				22,824				30,591	27,132	22,824
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance individually evaluated for impairment																58	246
Allowance collectively evaluated for impairment																30,533	26,886
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses																0	0
Allowance for loan losses	30,591			27,132	27,132			22,824	22,824			20,993	30,591	22,824	22,824	30,591	27,132
Loans individually evaluated for impairment																4,738	8,625
Loans collectively evaluated for impairment																3,870,210	3,540,538
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net																14,923	11,993
Loans receivable																3,889,871	3,561,156
Multifamily Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				3,818				1,633				1,360	3,818	1,633	1,360
Provision for loan losses													936	2,185	262
Recoveries													0	0	11
Charge-offs													0	0	0
Ending balance	4,754				3,818				1,633				4,754	3,818	1,633
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance individually evaluated for impairment																0	0
Allowance collectively evaluated for impairment																4,754	3,818
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses																0	0
Allowance for loan losses	4,754			3,818	3,818			1,633	1,633			1,360	3,818	1,633	1,633	4,754	3,818
Loans individually evaluated for impairment																0	0
Loans collectively evaluated for impairment																473,145	368,698
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net																7	138
Loans receivable																473,152	368,836
Construction and Land [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				24,442				27,568				34,252	24,442	27,568	34,252
Provision for loan losses													(1,611)	(2,860)	(7,921)
Recoveries													208	213	1,237
Charge-offs													(45)	(479)	0
Ending balance	22,994				24,442				27,568				22,994	24,442	27,568
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance individually evaluated for impairment																0	0
Allowance collectively evaluated for impairment																22,994	24,442
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses																0	0
Allowance for loan losses	22,994			24,442	24,442			27,568	27,568			34,252	24,442	24,442	34,252	22,994	24,442
Loans individually evaluated for impairment																1,467	3,096
Loans collectively evaluated for impairment																1,168,097	1,104,271
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net																0	137
Loans receivable																1,169,564	1,107,504
Commercial business [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				19,438				18,311				16,533	19,438	18,311	16,533
Provision for loan losses													7,478	2,129	4,355
Recoveries													625	1,049	1,226
Charge-offs													(4,171)	(2,051)	(3,803)
Ending balance	23,370				19,438				18,311				23,370	19,438	18,311
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance individually evaluated for impairment																4,128	16
Allowance collectively evaluated for impairment																19,224	19,399
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses																18	23
Allowance for loan losses	23,370			19,438	19,438			18,311	18,311			16,533	19,438	19,438	16,533	23,370	19,438
Loans individually evaluated for impairment																19,331	391
Loans collectively evaluated for impairment																1,674,125	1,482,195
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net																368	1,028
Loans receivable																1,693,824	1,483,614
Agricultural Business [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				3,778				4,053				2,967	3,778	4,053	2,967
Provision for loan losses													1,206	417	3,326
Recoveries													47	64	134
Charge-offs													(911)	(756)	(2,374)
Ending balance	4,120				3,778				4,053				4,120	3,778	4,053
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance individually evaluated for impairment																141	96
Allowance collectively evaluated for impairment																3,919	3,622
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses																60	60
Allowance for loan losses	4,120			3,778	3,778			4,053	4,053			2,967	4,120	4,053	4,053	4,120	3,778
Loans individually evaluated for impairment																2,243	3,298
Loans collectively evaluated for impairment																367,913	401,082
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net																393	493
Loans receivable																370,549	404,873
One- to four-family residential [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				4,714				2,055				2,238	4,714	2,055	2,238
Provision for loan losses													(1,053)	1,952	(415)
Recoveries													561	750	270
Charge-offs													(86)	(43)	(38)
Ending balance	4,136				4,714				2,055				4,136	4,714	2,055
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance individually evaluated for impairment																41	51
Allowance collectively evaluated for impairment																4,095	4,663
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses																0	0
Allowance for loan losses	4,136			4,714	4,714			2,055	2,055			2,238	4,714	4,714	2,238	4,136	4,714
Loans individually evaluated for impairment																4,390	4,469
Loans collectively evaluated for impairment																941,158	969,046
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net																74	101
Loans receivable																945,622	973,616
Consumer [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				7,972				3,866				4,104	7,972	3,866	4,104
Provision for loan losses													1,722	5,141	586
Recoveries													548	366	481
Charge-offs													(2,040)	(1,401)	(1,305)
Ending balance	8,202				7,972				3,866				8,202	7,972	3,866
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance individually evaluated for impairment																6	7
Allowance collectively evaluated for impairment																8,196	7,965
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses																0	0
Allowance for loan losses	8,202			7,972	7,972			3,866	3,866			4,104	7,972	3,866	3,866	8,202	7,972
Loans individually evaluated for impairment																235	196
Loans collectively evaluated for impairment																762,367	784,277
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net																173	523
Loans receivable																762,775	784,996
Unallocated [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				5,191				8,718				3,550	5,191	8,718	3,550
Provision for loan losses													(2,799)	(3,527)	5,168
Recoveries													0	0	0
Charge-offs													0	0	0
Ending balance	2,392				5,191				8,718				2,392	5,191	8,718
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance individually evaluated for impairment																0	0
Allowance collectively evaluated for impairment																2,392	5,191
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses																0	0
Allowance for loan losses	2,392			$ 5,191	$ 5,191			$ 8,718	$ 8,718			$ 3,550	2,392	$ 8,718	$ 8,718	2,392	5,191
Loans individually evaluated for impairment																0	0
Loans collectively evaluated for impairment																0	0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net																0	0
Loans receivable																0	$ 0
Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Ending balance	78												78
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses	$ 78												$ 78			$ 78