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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Age Analysis of Company's Past Due Loans) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total loans | $ 10,472,407 | $ 10,146,724
Non-accrual with no Allowance | 18,635 | 12,391
Nonaccrual loans | 28,071 | 21,706
Loans 90 days or more past due and still accruing | 109 | 1,287
Commerical real estate - owner-occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 894,876 | 845,320
Non-accrual with no Allowance | 0 | 0
Nonaccrual loans | 66 | 143
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 894,876 | 845,320
Commercial real estate - investment properties |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,558,176 | 1,589,975
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 | 1,558,176 | 1,589,975
Small Balance Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,172,825 | 1,200,251
Non-accrual with no Allowance | 1,865 | 2,927
Nonaccrual loans | 2,412 | 3,540
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 1,172,825 | 1,200,251
Multifamily Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 699,830 | 645,071
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 | 699,830 | 645,071
Commercial construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 183,765 | 184,876
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 | 183,765 | 184,876
Multifamily construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 433,868 | 325,816
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 | 433,868 | 325,816
One- to four- family construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 547,200 | 647,329
Non-accrual with no Allowance | 1,711 | 0
Nonaccrual loans | 1,711 | 0
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 547,200 | 647,329
Land and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 345,053 | 328,475
Non-accrual with no Allowance | 499 | 0
Nonaccrual loans | 569 | 181
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 345,053 | 328,475
Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,313,226 | 1,283,407
Non-accrual with no Allowance | 5,979 | 6,998
Nonaccrual loans | 6,397 | 7,356
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 1,313,226 | 1,283,407
Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 982,283 | 947,092
Non-accrual with no Allowance | 284 | 303
Nonaccrual loans | 2,042 | 2,530
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 982,283 | 947,092
Agricultural business, including secured by farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 310,120 | 295,077
Non-accrual with no Allowance | 3,997 | 594
Nonaccrual loans | 3,997 | 594
Loans 90 days or more past due and still accruing | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 310,120 | 295,077
One- to four-family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,340,126 | 1,173,112
Non-accrual with no Allowance | 3,479 | 1,569
Nonaccrual loans | 7,605 | 5,236
Loans 90 days or more past due and still accruing | 60 | 1,023
Financing Receivable, before Allowance for Credit Loss | 1,340,126 | 1,173,112
Consumer—home equity revolving lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 577,725 | 566,291
Non-accrual with no Allowance | 821 | 0
Nonaccrual loans | 3,258 | 2,124
Loans 90 days or more past due and still accruing | 49 | 254
Financing Receivable, before Allowance for Credit Loss | 577,725 | 566,291
Consumer-other |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 113,334 | 114,632
Non-accrual with no Allowance | 0 | 0
Nonaccrual loans | 14 | 2
Loans 90 days or more past due and still accruing | 0 | 10
Financing Receivable, before Allowance for Credit Loss | 113,334 | 114,632
30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 5,826 | 15,814
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 Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,560 | 1,859
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 | 900
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 | 921
30 to 59 Days Past Due [Member] | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 17 | 2,100
30 to 59 Days Past Due [Member] | Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 538 | 1,479
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 | 1,724 | 1,185
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 | 615 | 5,287
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 | 1,131 | 1,824
30 to 59 Days Past Due [Member] | Consumer-other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 241 | 259
60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,347 | 7,429
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 Commercial Real Estate Loans [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 |  |
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 | 1,255 | 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 | 498 | 0
60 to 89 Days Past Due [Member] | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 4,145
60 to 89 Days Past Due [Member] | Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 82 | 661
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 | 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 | 998 | 2,242
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 | 458 | 203
60 to 89 Days Past Due [Member] | Consumer-other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 56 | 178
90 Days or More Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 19,962 | 9,128
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 | 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 | 0 | 0
90 Days or More Past Due [Member] | Small Balance Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2 | 2
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 | 709 | 0
90 Days or More Past Due [Member] | Land and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 97
90 Days or More Past Due [Member] | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,290 | 649
90 Days or More Past Due [Member] | Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,150 | 1,019
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 | 2,952 | 594
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 | 6,501 | 5,175
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 | 2,354 | 1,582
90 Days or More Past Due [Member] | Consumer-other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4 | 10
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 29,135 | 32,371
Financial Asset, Past Due | Commerical real estate - owner-occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
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 Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,562 | 1,861
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 | 1,964 | 900
Financial Asset, Past Due | Land and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 498 | 1,018
Financial Asset, Past Due | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,307 | 6,894
Financial Asset, Past Due | Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,770 | 3,159
Financial Asset, Past Due | Agricultural business, including secured by farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,676 | 1,779
Financial Asset, Past Due | One- to four-family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 8,114 | 12,704
Financial Asset, Past Due | Consumer—home equity revolving lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,943 | 3,609
Financial Asset, Past Due | Consumer-other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 301 | 447
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 10,443,272 | 10,114,353
Financial Asset, Not Past Due | Commerical real estate - owner-occupied [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 894,876 | 845,320
Financial Asset, Not Past Due | Commercial real estate - investment properties |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,558,176 | 1,589,975
Financial Asset, Not Past Due | Small Balance Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,171,263 | 1,198,390
Financial Asset, Not Past Due | Multifamily Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 699,830 | 645,071
Financial Asset, Not Past Due | Commercial construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 183,765 | 184,876
Financial Asset, Not Past Due | Multifamily construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 433,868 | 325,816
Financial Asset, Not Past Due | One- to four- family construction |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 545,236 | 646,429
Financial Asset, Not Past Due | Land and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 344,555 | 327,457
Financial Asset, Not Past Due | Commercial Business |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,306,919 | 1,276,513
Financial Asset, Not Past Due | Small business scored |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 980,513 | 943,933
Financial Asset, Not Past Due | Agricultural business, including secured by farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 305,444 | 293,298
Financial Asset, Not Past Due | One- to four-family residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,332,012 | 1,160,408
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 | 573,782 | 562,682
Financial Asset, Not Past Due | Consumer-other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 113,033 | $ 114,185

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