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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, 2024 | Dec. 31, 2023
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Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 11,354,656 | $ 10,810,455
Financing Receivable, Nonaccrual, No Allowance | 15,382 | 11,714
Financing Receivable, Nonaccrual | 36,552 | 26,857
Loans 90 Days or More Past Due and Accruing | 404 | 2,745
Commerical real estate - owner-occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,027,426 | 915,897
Financing Receivable, Nonaccrual, No Allowance | 0 | 1,391
Financing Receivable, Nonaccrual | 2,182 | 1,450
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 | 1,623,672 | 1,541,344
Financing Receivable, Nonaccrual, No Allowance | 0 | 0
Financing Receivable, Nonaccrual | 0 | 0
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 | 1,213,792 | 1,178,500
Financing Receivable, Nonaccrual, No Allowance | 0 | 755
Financing Receivable, Nonaccrual | 4 | 1,227
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 | 894,425 | 811,232
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 | 122,362 | 170,011
Financing Receivable, Nonaccrual, No Allowance | 0 | 0
Financing Receivable, Nonaccrual | 0 | 0
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 | 513,706 | 503,993
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 | 514,220 | 526,432
Financing Receivable, Nonaccrual, No Allowance | 1,834 | 2,852
Financing Receivable, Nonaccrual | 1,834 | 3,105
Loans 90 Days or More Past Due and Accruing | 0 | 1,096
Land and Land Improvements [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 369,663 | 336,639
Financing Receivable, Nonaccrual, No Allowance | 1,622 | 0
Financing Receivable, Nonaccrual | 2,129 | 0
Loans 90 Days or More Past Due and Accruing | 0 | 42
Commercial business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,318,333 | 1,255,734
Financing Receivable, Nonaccrual, No Allowance | 123 | 789
Financing Receivable, Nonaccrual | 4,103 | 7,346
Loans 90 Days or More Past Due and Accruing | 0 | 0
Small Credit-Scored Business Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,104,117 | 1,022,154
Financing Receivable, Nonaccrual, No Allowance | 623 | 0
Financing Receivable, Nonaccrual | 2,964 | 1,656
Loans 90 Days or More Past Due and Accruing | 0 | 1
Agricultural business, including secured by farmland [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 340,280 | 331,089
Financing Receivable, Nonaccrual, No Allowance | 4,829 | 3,167
Financing Receivable, Nonaccrual | 8,485 | 3,167
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 | 1,591,260 | 1,518,046
Financing Receivable, Nonaccrual, No Allowance | 5,374 | 1,939
Financing Receivable, Nonaccrual | 10,016 | 5,702
Loans 90 Days or More Past Due and Accruing | 369 | 1,205
Home Equity Line of Credit [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 625,680 | 588,703
Financing Receivable, Nonaccrual, No Allowance | 977 | 821
Financing Receivable, Nonaccrual | 4,790 | 3,110
Loans 90 Days or More Past Due and Accruing | 35 | 391
Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 95,720 | 110,681
Financing Receivable, Nonaccrual, No Allowance | 0 | 0
Financing Receivable, Nonaccrual | 45 | 94
Loans 90 Days or More Past Due and Accruing | 0 | 10
30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 20,739 | 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 | 0 | 0
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 | 0
30 to 59 Days Past Due [Member] | Small Balance CRE [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 559
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 | 754 | 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 | 0 | 286
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 | 1,600 | 1,822
30 to 59 Days Past Due [Member] | Commercial business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,025 | 1,166
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 | 2,962 | 2,050
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 | 190 | 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 | 9,256 | 6,864
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 | 3,636 | 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 | 316 | 417
60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 8,102 | 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 [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 | 796 | 553
60 to 89 Days Past Due [Member] | Commercial business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 5,735
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 | 1,268 | 633
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 | 4,549 | 2,379
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 | 1,318 | 839
60 to 89 Days Past Due [Member] | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 171 | 141
90 Days or More Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 26,591 | 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 | 2,182 | 0
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 | 0 | 413
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 | 0
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 | 738 | 4,201
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 | 1,568 | 42
90 Days or More Past Due [Member] | Commercial business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,012 | 1,181
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 | 1,998 | 959
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 | 7,077 | 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 | 9,559 | 5,258
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 | 2,412 | 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 | 45 | 96
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 55,432 | 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 | 2,182 | 0
Financial Asset, Past Due | Commercial real estate - investment properties [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Financial Asset, Past Due | Small Balance CRE [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 972
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 | 754 | 0
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 | 738 | 4,487
Financial Asset, Past Due | Land and Land Improvements [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,964 | 2,417
Financial Asset, Past Due | Commercial business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,037 | 8,082
Financial Asset, Past Due | Small Credit-Scored Business Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,228 | 3,642
Financial Asset, Past Due | Agricultural business, including secured by farmland [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 7,267 | 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 | 23,364 | 14,501
Financial Asset, Past Due | Home Equity Line of Credit [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 7,366 | 6,238
Financial Asset, Past Due | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 532 | 654
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 11,299,224 | 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 | 1,025,244 | 915,897
Financial Asset, Not Past Due | Commercial real estate - investment properties [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,623,672 | 1,541,344
Financial Asset, Not Past Due | Small Balance CRE [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,213,792 | 1,177,528
Financial Asset, Not Past Due | Multifamily real estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 894,425 | 811,232
Financial Asset, Not Past Due | Commercial Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 121,608 | 170,011
Financial Asset, Not Past Due | Multifamily construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 513,706 | 503,993
Financial Asset, Not Past Due | One-to four-family construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 513,482 | 521,945
Financial Asset, Not Past Due | Land and Land Improvements [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 365,699 | 334,222
Financial Asset, Not Past Due | Commercial business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,315,296 | 1,247,652
Financial Asset, Not Past Due | Small Credit-Scored Business Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,097,889 | 1,018,512
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 | 333,013 | 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 | 1,567,896 | 1,503,545
Financial Asset, Not Past Due | Home Equity Line of Credit [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 618,314 | 582,465
Financial Asset, Not Past Due | Consumer Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 95,188 | $ 110,027

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