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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Age Analysis of Company's Past Due Loans) (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Financing Receivable, Past Due [Line Items]      
Non-accrual with no Allowance $ 15,655 $ 15,382  
Nonaccrual loans 38,589 36,552  
Loans 90 days or more past due and still accruing 370 404  
Financing Receivable, before Allowance for Credit Loss 11,438,796 11,354,656  
Commerical real estate - owner-occupied [Member]      
Financing Receivable, Past Due [Line Items]      
Non-accrual with no Allowance 0 0  
Nonaccrual loans 2,182 2,182  
Loans 90 days or more past due and still accruing 0 0  
Financing Receivable, before Allowance for Credit Loss 1,020,829 1,027,426  
Commercial real estate - investment properties      
Financing Receivable, Past Due [Line Items]      
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 1,598,387 1,623,672  
Small balance CRE      
Financing Receivable, Past Due [Line Items]      
Non-accrual with no Allowance 0 0  
Nonaccrual loans 0 4  
Loans 90 days or more past due and still accruing 0 0  
Financing Receivable, before Allowance for Credit Loss 1,217,458 1,213,792  
Multifamily Real Estate      
Financing Receivable, Past Due [Line Items]      
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 877,716 894,425  
Commercial construction      
Financing Receivable, Past Due [Line Items]      
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 146,467 122,362  
Multifamily construction      
Financing Receivable, Past Due [Line Items]      
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 618,942 513,706  
One- to four- family construction      
Financing Receivable, Past Due [Line Items]      
Non-accrual with no Allowance 1,897 1,834  
Nonaccrual loans 1,897 1,834  
Loans 90 days or more past due and still accruing 0 0  
Financing Receivable, before Allowance for Credit Loss 504,265 514,220  
Land and land development      
Financing Receivable, Past Due [Line Items]      
Non-accrual with no Allowance 1,033 1,622  
Nonaccrual loans 2,462 2,129  
Loans 90 days or more past due and still accruing 0 0  
Financing Receivable, before Allowance for Credit Loss 396,009 369,663  
Commercial Business      
Financing Receivable, Past Due [Line Items]      
Non-accrual with no Allowance 0 123  
Nonaccrual loans 2,669 4,103  
Loans 90 days or more past due and still accruing 0 0  
Financing Receivable, before Allowance for Credit Loss 1,283,754 1,318,333  
Small business scored      
Financing Receivable, Past Due [Line Items]      
Non-accrual with no Allowance 623 623  
Nonaccrual loans 3,756 2,964  
Loans 90 days or more past due and still accruing 206 0  
Financing Receivable, before Allowance for Credit Loss 1,122,550 1,104,117  
Agricultural business, including secured by farmland      
Financing Receivable, Past Due [Line Items]      
Non-accrual with no Allowance 6,255 4,829  
Nonaccrual loans 10,301 8,485  
Loans 90 days or more past due and still accruing 0 0  
Financing Receivable, before Allowance for Credit Loss 334,899 340,280  
One- to four-family residential [Member]      
Financing Receivable, Past Due [Line Items]      
Non-accrual with no Allowance 4,891 5,374  
Nonaccrual loans 10,448 10,016  
Loans 90 days or more past due and still accruing 9 369  
Financing Receivable, before Allowance for Credit Loss 1,600,283 1,591,260  
Consumer—home equity revolving lines of credit      
Financing Receivable, Past Due [Line Items]      
Non-accrual with no Allowance 956 977  
Nonaccrual loans 4,874 4,790  
Loans 90 days or more past due and still accruing 155 35  
Financing Receivable, before Allowance for Credit Loss 620,483 625,680  
Consumer Loan [Member]      
Financing Receivable, Past Due [Line Items]      
Non-accrual with no Allowance 0 0  
Nonaccrual loans 0 45  
Loans 90 days or more past due and still accruing 0 0  
Financing Receivable, before Allowance for Credit Loss 96,754 95,720  
30 to 59 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 36,774 20,739  
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated 0   $ 0
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      
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 1,407 0  
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 0 754  
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 1,160 0  
30 to 59 Days Past Due [Member] | Land and land development      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 1,216 1,600  
30 to 59 Days Past Due [Member] | Commercial Business      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 11,020 2,025  
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated 0   0
30 to 59 Days Past Due [Member] | Small business scored      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 3,957 2,962  
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 0 190  
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated     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 15,076 9,256  
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated     0
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 2,509 3,636  
30 to 59 Days Past Due [Member] | Consumer Loan [Member]      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 429 316  
60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 10,674 8,102  
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated 0   0
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 497 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 271 796  
60 to 89 Days Past Due [Member] | Commercial Business      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 219 0  
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated 0   0
60 to 89 Days Past Due [Member] | Small business scored      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 336 1,268  
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 3,466 0  
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated     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 4,498 4,549  
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated     0
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 1,318 1,318  
60 to 89 Days Past Due [Member] | Consumer Loan [Member]      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 69 171  
90 Days or More Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 24,479 26,591  
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated 0   0
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 2,183 2,182  
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 0 0  
90 Days or More Past Due [Member] | Small balance CRE      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 0 0  
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 737 738  
90 Days or More Past Due [Member] | Land and land development      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 1,675 1,568  
90 Days or More Past Due [Member] | Commercial Business      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 555 1,012  
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated 0   0
90 Days or More Past Due [Member] | Small business scored      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 3,051 1,998  
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 5,680 7,077  
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated     0
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 8,218 9,559  
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated     0
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 2,380 2,412  
90 Days or More Past Due [Member] | Consumer Loan [Member]      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 0 45  
Financial Asset, Past Due      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 71,927 55,432  
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated 1,183   2,765
Financial Asset, Past Due | Commerical real estate - owner-occupied [Member]      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 2,183 2,182  
Financial Asset, Past Due | Commercial real estate - investment properties      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 0 0  
Financial Asset, Past Due | Small balance CRE      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 1,904 0  
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 0 754  
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 1,897 738  
Financial Asset, Past Due | Land and land development      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 3,162 3,964  
Financial Asset, Past Due | Commercial Business      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 11,794 3,037  
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated 1,183   121
Financial Asset, Past Due | Small business scored      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 7,344 6,228  
Financial Asset, Past Due | Agricultural business, including secured by farmland      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 9,146 7,267  
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated     1,584
Financial Asset, Past Due | One- to four-family residential [Member]      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 27,792 23,364  
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated     1,060
Financial Asset, Past Due | Consumer—home equity revolving lines of credit      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 6,207 7,366  
Financial Asset, Past Due | Consumer Loan [Member]      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 498 532  
Financial Asset, Not Past Due      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 11,366,869 11,299,224  
Financial Asset, Not Past Due | Commerical real estate - owner-occupied [Member]      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 1,018,646 1,025,244  
Financial Asset, Not Past Due | Commercial real estate - investment properties      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 1,598,387 1,623,672  
Financial Asset, Not Past Due | Small balance CRE      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 1,215,554 1,213,792  
Financial Asset, Not Past Due | Multifamily Real Estate      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 877,716 894,425  
Financial Asset, Not Past Due | Commercial construction      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 146,467 121,608  
Financial Asset, Not Past Due | Multifamily construction      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 618,942 513,706  
Financial Asset, Not Past Due | One- to four- family construction      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 502,368 513,482  
Financial Asset, Not Past Due | Land and land development      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 392,847 365,699  
Financial Asset, Not Past Due | Commercial Business      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 1,271,960 1,315,296  
Financial Asset, Not Past Due | Small business scored      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 1,115,206 1,097,889  
Financial Asset, Not Past Due | Agricultural business, including secured by farmland      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 325,753 333,013  
Financial Asset, Not Past Due | One- to four-family residential [Member]      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 1,572,491 1,567,896  
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 614,276 618,314  
Financial Asset, Not Past Due | Consumer Loan [Member]      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, before Allowance for Credit Loss 96,256 $ 95,188  
Financial Asset, Nonaccrual      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated     2,765
Financial Asset, Nonaccrual | Commercial Business      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated $ 1,183   121
Financial Asset, Nonaccrual | Agricultural business, including secured by farmland      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated     1,584
Financial Asset, Nonaccrual | One- to four-family residential [Member]      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated     $ 1,060