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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Age Analysis of Company's Past Due Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Loans receivable	$ 11,224,606	$ 10,810,455
Non-accrual with no Allowance	16,849	11,714
Nonaccrual loans	39,049	26,857
Loans 90 days or more past due and still accruing	3,958	2,745
Commerical real estate - owner-occupied [Member]
Financing Receivable, Past Due [Line Items]
Loans receivable	990,516	915,897
Non-accrual with no Allowance	1,044	1,391
Nonaccrual loans	1,094	1,450
Loans 90 days or more past due and still accruing	0	0
Financing Receivable, before Allowance for Credit Loss	990,516	915,897
Commercial real estate - investment properties
Financing Receivable, Past Due [Line Items]
Loans receivable	1,583,863	1,541,344
Non-accrual with no Allowance	0	0
Nonaccrual loans	0	0
Loans 90 days or more past due and still accruing	2,258	0
Financing Receivable, before Allowance for Credit Loss	1,583,863	1,541,344
Small balance CRE
Financing Receivable, Past Due [Line Items]
Loans receivable	1,218,822	1,178,500
Non-accrual with no Allowance	581	755
Nonaccrual loans	1,033	1,227
Loans 90 days or more past due and still accruing	0	0
Financing Receivable, before Allowance for Credit Loss	1,218,822	1,178,500
Multifamily Real Estate
Financing Receivable, Past Due [Line Items]
Loans receivable	889,866	811,232
Non-accrual with no Allowance	0	0
Nonaccrual loans	0	0
Loans 90 days or more past due and still accruing	0	0
Financing Receivable, before Allowance for Credit Loss	889,866	811,232
Commercial construction
Financing Receivable, Past Due [Line Items]
Loans receivable	124,051	170,011
Non-accrual with no Allowance	0	0
Nonaccrual loans	0	0
Loans 90 days or more past due and still accruing	0	0
Financing Receivable, before Allowance for Credit Loss	124,051	170,011
Multifamily construction
Financing Receivable, Past Due [Line Items]
Loans receivable	524,108	503,993
Non-accrual with no Allowance	0	0
Nonaccrual loans	0	0
Loans 90 days or more past due and still accruing	0	0
Financing Receivable, before Allowance for Credit Loss	524,108	503,993
One- to four- family construction
Financing Receivable, Past Due [Line Items]
Loans receivable	507,350	526,432
Non-accrual with no Allowance	1,834	2,852
Nonaccrual loans	1,942	3,105
Loans 90 days or more past due and still accruing	380	1,096
Financing Receivable, before Allowance for Credit Loss	507,350	526,432
Land and land development
Financing Receivable, Past Due [Line Items]
Loans receivable	370,690	336,639
Non-accrual with no Allowance	1,624	0
Nonaccrual loans	2,344	0
Loans 90 days or more past due and still accruing	0	42
Financing Receivable, before Allowance for Credit Loss	370,690	336,639
Commercial Business
Financing Receivable, Past Due [Line Items]
Loans receivable	1,281,615	1,255,734
Non-accrual with no Allowance	123	789
Nonaccrual loans	7,777	7,346
Loans 90 days or more past due and still accruing	0	0
Financing Receivable, before Allowance for Credit Loss	1,281,615	1,255,734
Small business scored
Financing Receivable, Past Due [Line Items]
Loans receivable	1,087,714	1,022,154
Non-accrual with no Allowance	0	0
Nonaccrual loans	2,928	1,656
Loans 90 days or more past due and still accruing	0	1
Financing Receivable, before Allowance for Credit Loss	1,087,714	1,022,154
Agricultural business, including secured by farmland
Financing Receivable, Past Due [Line Items]
Loans receivable	346,686	331,089
Non-accrual with no Allowance	5,455	3,167
Nonaccrual loans	7,703	3,167
Loans 90 days or more past due and still accruing	0	0
Financing Receivable, before Allowance for Credit Loss	346,686	331,089
One- to four-family residential [Member]
Financing Receivable, Past Due [Line Items]
Loans receivable	1,575,164	1,518,046
Non-accrual with no Allowance	5,367	1,939
Nonaccrual loans	9,592	5,702
Loans 90 days or more past due and still accruing	961	1,205
Financing Receivable, before Allowance for Credit Loss	1,575,164	1,518,046
Consumer—home equity revolving lines of credit
Financing Receivable, Past Due [Line Items]
Loans receivable	622,615	588,703
Non-accrual with no Allowance	821	821
Nonaccrual loans	4,631	3,110
Loans 90 days or more past due and still accruing	359	391
Financing Receivable, before Allowance for Credit Loss	622,615	588,703
Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Loans receivable	101,546	110,681
Non-accrual with no Allowance	0	0
Nonaccrual loans	5	94
Loans 90 days or more past due and still accruing	0	10
Financing Receivable, before Allowance for Credit Loss	101,546	110,681
30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	9,373	15,936
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	212	0
30 to 59 Days Past Due [Member] | Commercial real estate - investment properties
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
30 to 59 Days Past Due [Member] | Small balance CRE
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	175	559
30 to 59 Days Past Due [Member] | Multifamily Real Estate
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
30 to 59 Days Past Due [Member] | Commercial construction
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
30 to 59 Days Past Due [Member] | Multifamily construction
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
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	286
30 to 59 Days Past Due [Member] | Land and land development
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	1,822
30 to 59 Days Past Due [Member] | Commercial Business
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	865	1,166
30 to 59 Days Past Due [Member] | Small business scored
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,828	2,050
30 to 59 Days Past Due [Member] | Agricultural business, including secured by farmland
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,519	0
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	297	6,864
30 to 59 Days Past Due [Member] | Consumer—home equity revolving lines of credit
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,967	2,772
30 to 59 Days Past Due [Member] | Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	510	417
60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	9,220	10,280
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
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
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	333	0
60 to 89 Days Past Due [Member] | Multifamily Real Estate
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
60 to 89 Days Past Due [Member] | Commercial construction
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
60 to 89 Days Past Due [Member] | Multifamily construction
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
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 development
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	83	553
60 to 89 Days Past Due [Member] | Commercial Business
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,500	5,735
60 to 89 Days Past Due [Member] | Small business scored
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	684	633
60 to 89 Days Past Due [Member] | Agricultural business, including secured by farmland
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,500	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	1,818	2,379
60 to 89 Days Past Due [Member] | Consumer—home equity revolving lines of credit
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,202	839
60 to 89 Days Past Due [Member] | Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	100	141
90 Days or More Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	26,063	16,948
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	1,044	0
90 Days or More Past Due [Member] | Commercial real estate - investment properties
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,258	0
90 Days or More Past Due [Member] | Small balance CRE
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	413	413
90 Days or More Past Due [Member] | Multifamily Real Estate
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
90 Days or More Past Due [Member] | Commercial construction
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
90 Days or More Past Due [Member] | Multifamily construction
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
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,225	4,201
90 Days or More Past Due [Member] | Land and land development
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,778	42
90 Days or More Past Due [Member] | Commercial Business
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,565	1,181
90 Days or More Past Due [Member] | Small business scored
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,303	959
90 Days or More Past Due [Member] | Agricultural business, including secured by farmland
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,856	2,171
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	8,644	5,258
90 Days or More Past Due [Member] | Consumer—home equity revolving lines of credit
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,977	2,627
90 Days or More Past Due [Member] | Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	96
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	44,656	43,164
Financial Asset, Past Due | Commerical real estate - owner-occupied [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,256	0
Financial Asset, Past Due | Commercial real estate - investment properties
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,258	0
Financial Asset, Past Due | Small balance CRE
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	921	972
Financial Asset, Past Due | Multifamily Real Estate
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due | Commercial construction
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due | Multifamily construction
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Financial Asset, Past Due | One- to four- family construction
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,225	4,487
Financial Asset, Past Due | Land and land development
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,861	2,417
Financial Asset, Past Due | Commercial Business
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,930	8,082
Financial Asset, Past Due | Small business scored
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,815	3,642
Financial Asset, Past Due | Agricultural business, including secured by farmland
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	7,875	2,171
Financial Asset, Past Due | One- to four-family residential [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	10,759	14,501
Financial Asset, Past Due | Consumer—home equity revolving lines of credit
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	9,146	6,238
Financial Asset, Past Due | Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	610	654
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	11,179,950	10,767,291
Financial Asset, Not Past Due | Commerical real estate - owner-occupied [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	989,260	915,897
Financial Asset, Not Past Due | Commercial real estate - investment properties
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,581,605	1,541,344
Financial Asset, Not Past Due | Small balance CRE
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,217,901	1,177,528
Financial Asset, Not Past Due | Multifamily Real Estate
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	889,866	811,232
Financial Asset, Not Past Due | Commercial construction
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	124,051	170,011
Financial Asset, Not Past Due | Multifamily construction
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	524,108	503,993
Financial Asset, Not Past Due | One- to four- family construction
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	506,125	521,945
Financial Asset, Not Past Due | Land and land development
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	368,829	334,222
Financial Asset, Not Past Due | Commercial Business
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,277,685	1,247,652
Financial Asset, Not Past Due | Small business scored
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,082,899	1,018,512
Financial Asset, Not Past Due | Agricultural business, including secured by farmland
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	338,811	328,918
Financial Asset, Not Past Due | One- to four-family residential [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,564,405	1,503,545
Financial Asset, Not Past Due | Consumer—home equity revolving lines of credit
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	613,469	582,465
Financial Asset, Not Past Due | Consumer Loan [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 100,936	$ 110,027

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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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