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LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Age Analysis of Company's Past Due Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Loans and Leases Receivable, Gross	$ 10,146,724	$ 9,084,763
Financing Receivable, Nonaccrual, No Allowance	12,391	11,765
Financing Receivable, Nonaccrual	21,706	22,281
Loans 90 Days or More Past Due and Accruing	1,287	555
Commerical real estate - owner-occupied [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	845,320	831,623
Loans and Leases Receivable, Gross	845,320	831,623
Financing Receivable, Nonaccrual, No Allowance	0	924
Financing Receivable, Nonaccrual	143	1,456
Loans 90 Days or More Past Due and Accruing	0	0
Commercial real estate - investment properties [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,589,975	1,674,027
Loans and Leases Receivable, Gross	1,589,975	1,674,027
Financing Receivable, Nonaccrual, No Allowance	0	3,706
Financing Receivable, Nonaccrual	0	6,282
Loans 90 Days or More Past Due and Accruing	0	0
Small Balance CRE [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,200,251	1,281,863
Loans and Leases Receivable, Gross	1,200,251	1,281,863
Financing Receivable, Nonaccrual, No Allowance	2,927	5,886
Financing Receivable, Nonaccrual	3,540	6,421
Loans 90 Days or More Past Due and Accruing	0	0
Multifamily real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	645,071	530,885
Loans and Leases Receivable, Gross	645,071	530,885
Financing Receivable, Nonaccrual, No Allowance	0	0
Financing Receivable, Nonaccrual	0	0
Loans 90 Days or More Past Due and Accruing	0	0
Commercial Construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	184,876	167,998
Loans and Leases Receivable, Gross	184,876	167,998
Financing Receivable, Nonaccrual, No Allowance	0	0
Financing Receivable, Nonaccrual	0	98
Loans 90 Days or More Past Due and Accruing	0	0
Multifamily construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	325,816	259,116
Loans and Leases Receivable, Gross	325,816	259,116
Financing Receivable, Nonaccrual, No Allowance	0	0
Financing Receivable, Nonaccrual	0	0
Loans 90 Days or More Past Due and Accruing	0	0
One-to four-family construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	647,329	568,753
Loans and Leases Receivable, Gross	647,329	568,753
Financing Receivable, Nonaccrual, No Allowance	0	0
Financing Receivable, Nonaccrual	0	0
Loans 90 Days or More Past Due and Accruing	0	0
Land and Land Improvements [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	328,475	313,454
Loans and Leases Receivable, Gross	328,475	313,454
Financing Receivable, Nonaccrual, No Allowance	0	0
Financing Receivable, Nonaccrual	181	381
Loans 90 Days or More Past Due and Accruing	0	0
Commercial business [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,283,407	1,170,780
Loans and Leases Receivable, Gross	1,283,407	1,170,780
Financing Receivable, Nonaccrual, No Allowance	6,998	228
Financing Receivable, Nonaccrual	7,356	1,144
Loans 90 Days or More Past Due and Accruing	0	2
Small Credit-Scored Business Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	947,092	792,310
Loans and Leases Receivable, Gross	947,092	792,310
Financing Receivable, Nonaccrual, No Allowance	303	0
Financing Receivable, Nonaccrual	2,530	1,012
Loans 90 Days or More Past Due and Accruing	0	0
Agricultural business, including secured by farmland [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	295,077	280,578
Loans and Leases Receivable, Gross	295,077	280,578
Financing Receivable, Nonaccrual, No Allowance	594	1,021
Financing Receivable, Nonaccrual	594	1,022
Loans 90 Days or More Past Due and Accruing	0	0
One- to four-family residential [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,173,112	657,474
Loans and Leases Receivable, Gross	1,173,112	657,474
Financing Receivable, Nonaccrual, No Allowance	1,569	0
Financing Receivable, Nonaccrual	5,236	2,711
Loans 90 Days or More Past Due and Accruing	1,023	436
Home Equity Line of Credit [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	566,291	458,533
Loans and Leases Receivable, Gross	566,291	458,533
Financing Receivable, Nonaccrual, No Allowance	0	0
Financing Receivable, Nonaccrual	2,124	1,736
Loans 90 Days or More Past Due and Accruing	254	114
Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	114,632	97,369
Loans and Leases Receivable, Gross	114,632	97,369
Financing Receivable, Nonaccrual, No Allowance	0	0
Financing Receivable, Nonaccrual	2	18
Loans 90 Days or More Past Due and Accruing	10	3
30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	15,814	10,527
30 to 59 Days Past Due [Member] | Commerical real estate - owner-occupied [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	233
30 to 59 Days Past Due [Member] | Commercial real estate - investment properties [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	81
30 to 59 Days Past Due [Member] | Small Balance CRE [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,859	89
30 to 59 Days Past Due [Member] | Multifamily real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
30 to 59 Days Past Due [Member] | Commercial Construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
30 to 59 Days Past Due [Member] | Multifamily construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
30 to 59 Days Past Due [Member] | One-to four-family construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	900	162
30 to 59 Days Past Due [Member] | Land and Land Improvements [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	921	51
30 to 59 Days Past Due [Member] | Commercial business [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,100	5,157
30 to 59 Days Past Due [Member] | Small Credit-Scored Business Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,479	924
30 to 59 Days Past Due [Member] | Agricultural business, including secured by farmland [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,185	139
30 to 59 Days Past Due [Member] | One- to four-family residential [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,287	2,318
30 to 59 Days Past Due [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,824	985
30 to 59 Days Past Due [Member] | Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	259	388
60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	7,429	2,142
60 to 89 Days Past Due [Member] | Commerical real estate - owner-occupied [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
60 to 89 Days Past Due [Member] | Commercial real estate - investment properties [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
60 to 89 Days Past Due [Member] | Small Balance CRE [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
60 to 89 Days Past Due [Member] | Multifamily real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
60 to 89 Days Past Due [Member] | Commercial Construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
60 to 89 Days Past Due [Member] | Multifamily construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
60 to 89 Days Past Due [Member] | One-to four-family construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
60 to 89 Days Past Due [Member] | Land and Land Improvements [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
60 to 89 Days Past Due [Member] | Commercial business [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,145	1,007
60 to 89 Days Past Due [Member] | Small Credit-Scored Business Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	661	465
60 to 89 Days Past Due [Member] | Agricultural business, including secured by farmland [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
60 to 89 Days Past Due [Member] | One- to four-family residential [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,242	327
60 to 89 Days Past Due [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	203	268
60 to 89 Days Past Due [Member] | Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	178	75
90 Days or More Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	9,128	6,019
90 Days or More Past Due [Member] | Commerical real estate - owner-occupied [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	448
90 Days or More Past Due [Member] | Commercial real estate - investment properties [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
90 Days or More Past Due [Member] | Small Balance CRE [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2	1,298
90 Days or More Past Due [Member] | Multifamily real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
90 Days or More Past Due [Member] | Commercial Construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	98
90 Days or More Past Due [Member] | Multifamily construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
90 Days or More Past Due [Member] | One-to four-family construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
90 Days or More Past Due [Member] | Land and Land Improvements [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	97	14
90 Days or More Past Due [Member] | Commercial business [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	649	588
90 Days or More Past Due [Member] | Small Credit-Scored Business Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,019	508
90 Days or More Past Due [Member] | Agricultural business, including secured by farmland [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	594	1,021
90 Days or More Past Due [Member] | One- to four-family residential [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,175	1,225
90 Days or More Past Due [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,582	803
90 Days or More Past Due [Member] | Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	10	16
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	32,371	18,688
Financial Asset, Past Due | Commerical real estate - owner-occupied [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	681
Financial Asset, Past Due | Commercial real estate - investment properties [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	81
Financial Asset, Past Due | Small Balance CRE [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,861	1,387
Financial Asset, Past Due | Multifamily real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due | Commercial Construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	98
Financial Asset, Past Due | Multifamily construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due | One-to four-family construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	900	162
Financial Asset, Past Due | Land and Land Improvements [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,018	65
Financial Asset, Past Due | Commercial business [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	6,894	6,752
Financial Asset, Past Due | Small Credit-Scored Business Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,159	1,897
Financial Asset, Past Due | Agricultural business, including secured by farmland [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,779	1,160
Financial Asset, Past Due | One- to four-family residential [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	12,704	3,870
Financial Asset, Past Due | Home Equity Line of Credit [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,609	2,056
Financial Asset, Past Due | Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	447	479
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	10,114,353	9,066,075
Financial Asset, Not Past Due | Commerical real estate - owner-occupied [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	845,320	830,942
Financial Asset, Not Past Due | Commercial real estate - investment properties [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,589,975	1,673,946
Financial Asset, Not Past Due | Small Balance CRE [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,198,390	1,280,476
Financial Asset, Not Past Due | Multifamily real estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	645,071	530,885
Financial Asset, Not Past Due | Commercial Construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	184,876	167,900
Financial Asset, Not Past Due | Multifamily construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	325,816	259,116
Financial Asset, Not Past Due | One-to four-family construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	646,429	568,591
Financial Asset, Not Past Due | Land and Land Improvements [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	327,457	313,389
Financial Asset, Not Past Due | Commercial business [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,276,513	1,164,028
Financial Asset, Not Past Due | Small Credit-Scored Business Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	943,933	790,413
Financial Asset, Not Past Due | Agricultural business, including secured by farmland [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	293,298	279,418
Financial Asset, Not Past Due | One- to four-family residential [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,160,408	653,604
Financial Asset, Not Past Due | Home Equity Line of Credit [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	562,682	456,477
Financial Asset, Not Past Due | Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 114,185	$ 96,890

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Amortized cost of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1404
-Paragraph (a)

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